-
LTC5592
15592fa
For more information www.linear.com/LTC5592
IFAMP ADC
IFAMP
RF2300MHz TO
2400MHzLNA
BIAS
BIAS
SYNTH
VCCIF3.3V or 5V
VCCIF
VCC3.3V
VCC
22pF
22pF
22pF
1µF
22pF 1µF
22pF
150nH 150nH
1nF
1nF
190MHzSAW
190MHzBPF
IMAGEBPF
RFA
RFB
ENA
LO
ENA(0V/3.3V)
LO 2160MHz2.2pF
VCCA
VCCB
IFA+ IFA–
IFB+ IFB–
5592 TA01a
LOAMP
LOAMP
ENB ENB(0V/3.3V)
RF2300MHz TO
2400MHzLNA
22pFIMAGE
BPF
IFAMP
IFAMP ADC
150nH 150nH
1nF
1nF 190MHzSAW
190MHzBPF
Typical applicaTion
FeaTures DescripTion
Dual 1.6GHz to 2.7GHz High Dynamic Range
Downconverting Mixer
The LTC®5592 is part of a family of dual-channel high dy-namic range, high gain downconverting mixers covering the 600MHz to 4.5GHz RF frequency range. The LTC5592 is optimized for 1.6GHz to 2.7GHz RF applications. The LO frequency must fall within the 1.5GHz to 2.5GHz range for optimum performance. A typical application is a LTE or WiMAX receiver with a 2.3GHz to 2.7GHz RF input and low side LO.
The LTC5592’s high conversion gain and high dynamic range enable the use of lossy IF filters in high selectivity receiver designs, while minimizing the total solution cost, board space and system-level variation. A low current mode is provided for additional power savings and each of the mixer channels has independent shutdown control.
Wideband LTE Receiver
applicaTions
n Conversion Gain: 8.3dB at 2.35GHzn IIP3: 27.3dBm at 2.35GHzn Noise Figure: 9.8dB at 2.35GHzn 15.3dB NF Under 5dBm Blockingn High Input P1dBn 47dB Channel-to-Channel Isolationn 3.3V Supply, 1.3W Power Consumptionn Low Power Mode for 0.8W Consumptionn Independent Channel Shutdown Controln 50Ω Single-Ended RF and LO Inputsn LO Input Matched In All Modesn 0dBm LO Drive Leveln Small Package and Solution Sizen –40°C to 105°C Operation
n 3G/4G Wireless Infrastructure Diversity Receivers (LTE, W-CDMA, TD-SCDMA, WiMAX, GSM 1800)n MIMO Infrastructure Diversity Receiversn High Dynamic Range Downmixer ApplicationsL, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
High Dynamic Range Dual Downconverting Mixer FamilyPART NUMBER RF RANGE LO RANGE
LTC5590 600MHz to 1.7GHz 700MHz to 1.5GHz
LTC5591 1.3GHz to 2.3GHz 1.4GHz to 2.1GHz
LTC5592 1.6GHz to 2.7GHz 1.5GHz to 2.5GHz
LTC5593 2.3GHz to 4.5GHz 2.1GHz to 4.2GHz
Wideband Conversion Gain and IIP3 vs IF Frequency
IF FREQUENCY (MHz)160
6
7
G C (d
B)
IIP3 (dBm)
9
10
11
13
14
12
170 190
5592 TA01b
8
180 200 210 22021
23
25
27
28
29
22
24
26
LO = 2160MHzPLO = 0dBmRF = 2350 ±30MHzTEST CIRCUIT IN FIGURE 1
GC
IIP3
LTC5592 ONLY, MEASURED ON EVALUATION BOARD
http://www.linear.com/LTC5592
-
LTC5592
25592fa
For more information www.linear.com/LTC5592
pin conFiguraTionabsoluTe MaxiMuM raTings
Supply Voltage (VCC) ...............................................4.0VIF Supply Voltage (VCCIF) .........................................5.5VEnable Voltage (ENA, ENB) ..............–0.3V to VCC + 0.3VBias Adjust Voltage (IFBA, IFBB) ......–0.3V to VCC + 0.3VPower Select Voltage (ISEL) .............–0.3V to VCC + 0.3VLO Input Power (1GHz to 3GHz) .............................9dBmLO Input DC Voltage ............................................... ±0.1VRFA, RFB Input Power (1GHz to 3GHz) ................15dBmRFA, RFB Input DC Voltage .................................... ±0.1VOperating Temperature Range (TC) ........ –40°C to 105°CStorage Temperature Range .................. –65°C to 150°CJunction Temperature (TJ) .................................... 150°C
(Note 1)
24 23 22 21 20 19
7 8 9
TOP VIEW
25GND
UH PACKAGE24-LEAD (5mm × 5mm) PLASTIC QFN
10 11 12
6
5
4
3
2
1
13
14
15
16
17
18RFA
CTA
GND
GND
CTB
RFB
ISELENA
LO
GND
ENB
GND
GND
IFGN
DA
IFA+
IFA–
IFBA
V CCA
GND
IFGN
DB IFB+
IFB–
IFBB
V CCB
TJMAX = 150°C, θJC = 7°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTionLEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC5592IUH#PBF LTC5592IUH#TRPBF 5592 24-Lead (5mm × 5mm) Plastic QFN –40°C to 105°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts.For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
Dc elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply Requirements (VCCA, VCCB, VCCIFA, VCCIFB)
VCCA, VCCB Supply Voltage (Pins 12, 19) 3.1 3.3 3.5 V
VCCIFA, VCCIFB Supply Voltage (Pins 9, 10, 21, 22) 3.1 3.3 5.3 V
Mixer Supply Current (Pins 12, 19) Both Channels Enabled 199 237 mA
IF Amplifier Supply Current (Pins 9, 10, 21, 22) Both Channels Enabled 202 252 mA
Total Supply Current (Pins 9, 10, 12, 19, 21, 22) Both Channels Enabled 401 489 mA
Total Supply Current – Shutdown ENA = ENB = Low 500 µA
Enable Logic Input (ENA, ENB) High = On, Low = Off
ENA, ENB Input High Voltage (On) 2.5 V
ENA, ENB Input Low Voltage (Off) 0.3 V
ENA, ENB Input Current –0.3V to VCC + 0.3V –20 30 µA
Turn On Time 0.9 µs
Turn Off Time 1 µs
VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, unless otherwise noted. Test circuit shown in Figure 1. (Note 2)
-
LTC5592
35592fa
For more information www.linear.com/LTC5592
Dc elecTrical characTerisTics VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, unless otherwise noted. Test circuit shown in Figure 1. (Note 2)PARAMETER CONDITIONS MIN TYP MAX UNITS
Low Power Mode Logic Input (ISEL) High = Low Power, Low = Normal Power Mode
ISEL Input High Voltage 2.5 V
ISEL Input Low Voltage 0.3 V
ISEL Input Current –0.3V to VCC + 0.3V –20 30 µA
Low Power Mode Current Consumption (ISEL = High)
Mixer Supply Current (Pins 12, 19) Both Channels Enabled 130 156 mA
IF Amplifier Supply Current (Pins 9, 10, 21, 22) Both Channels Enabled 122 156 mA
Total Supply Current (Pins 9, 10, 12, 19, 21, 22) Both Channels Enabled 252 312 mA
PARAMETER CONDITIONS MIN TYP MAX UNITS
Conversion Gain RF = 1950MHz RF = 2350MHz RF = 2550MHz
6.8
9.5 8.3 8.1
dB dB dB
Conversion Gain Flatness RF = 2350 ±30MHz, LO = 2160MHz, IF = 190 ±30MHz ±0.14 dB
Conversion Gain vs Temperature TC = –40ºC to 105ºC, RF = 2350MHz –0.006 dB/°C
Input 3rd Order Intercept RF = 1950MHz RF = 2350MHz RF = 2550MHz
24.0
26.3 27.3 26.3
dBm dBm dBm
SSB Noise Figure RF = 1950MHz RF = 2350MHz RF = 2550MHz
9.4 9.8 9.9
dB dB dB
PARAMETER CONDITIONS MIN TYP MAX UNITS
LO Input Frequency Range 1500 to 2500 MHz
RF Input Frequency Range Low Side LO High Side LO
1600 to 2700 1600 to 2300
MHz MHz
IF Output Frequency Range Requires External Matching 5 to 500 MHz
RF Input Return Loss ZO = 50Ω, 1600MHz to 2700MHz >13 dB
LO Input Return Loss ZO = 50Ω, 1700MHz to 2500MHz >17 dB
IF Output Impedance Differential at 190MHz 379Ω||2.2pF R||C
LO Input Power fLO = 1700MHz to 2500MHz –4 0 6 dBm
LO to RF Leakage fLO = 1700MHz to 2500MHz 37 dB
Channel-to-Channel Isolation fRF = 1600MHz to 2700MHz >47 dB
ac elecTrical characTerisTics VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, PLO = 0dBm, PRF = –3dBm (∆f = 2MHz for two tone IIP3 tests), unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3, 4)
Low Side LO Downmixer Application: ISEL = Low, RF = 1900MHz to 2700MHz, IF = 190MHz, fLO = fRF – fIF
-
LTC5592
45592fa
For more information www.linear.com/LTC5592
PARAMETER CONDITIONS MIN TYP MAX UNITS
Conversion Gain RF = 2350MHz 7.1 dB
Input 3rd Order Intercept RF = 2350MHz 22.3 dBm
SSB Noise Figure RF = 2350MHz 10.2 dB
Input 1dB Compression RF = 2350MHz, VCCIF = 3.3V RF = 2350MHz, VCCIF = 5V
11.3 12.6
dBm dBm
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.Note 2: The LTC5592 is guaranteed functional over the case operating temperature range of –40°C to 105°C (θJC = 7°C/W).
Note 3: SSB Noise Figure measured with a small-signal noise source, bandpass filter and 6dB matching pad on RF input, bandpass filter and 6dB matching pad on the LO input, and no other RF signals applied.Note 4: Channel A to channel B isolation is measured as the relative IF output power of channel B to channel A, with the RF input signal applied to channel A. The RF input of channel B is 50Ω terminated and both mixers are enabled.
ac elecTrical characTerisTics VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, TC = 25°C, PLO = 0dBm, PRF = –3dBm (∆f = 2MHz for two tone IIP3 tests), unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
SSB Noise Figure Under Blocking fRF = 2400MHz, fLO = 2210MHz, fBLOCK = 2500MHz PBLOCK = 5dBm PBLOCK = 10dBm
15.3 21.2
dB dB
2RF-2LO Output Spurious Product (fRF = fLO + fIF/2)
fRF = 2255MHz at –10dBm, fLO = 2160MHz, fIF = 190MHz
–68 dBc
3RF-3LO Output Spurious Product (fRF = fLO + fIF/3)
fRF = 2223.33MHz at –10dBm, fLO = 2160MHz, fIF = 190MHz
–74 dBc
Input 1dB Compression fRF = 2350MHz, VCCIF = 3.3V fRF = 2350MHz, VCCIF = 5V
11 14.6
dBm dBm
Low Side LO Downmixer Application: ISEL = Low, RF = 1900MHz to 2700MHz, IF = 190MHz, fLO = fRF – fIF
Low Power Mode, Low Side LO Downmixer Application: ISEL = High, RF = 1900MHz to 2700MHz, IF = 190MHz, fLO = fRF – fIF
PARAMETER CONDITIONS MIN TYP MAX UNITS
Conversion Gain RF = 1750MHz RF = 1950MHz RF = 2150MHz
9.1 8.7 8.3
dB dB dB
Conversion Gain Flatness RF = 1950 ±30MHz, LO = 2140MHz, IF = 190 ±30MHz ±0.33 dB
Conversion Gain vs Temperature TC = –40ºC to 105ºC, RF = 1900MHz –0.005 dB/°C
Input 3rd Order Intercept RF = 1750MHz RF = 1950MHz RF = 2150MHz
25.3 25.4 25.1
dBm dBm dBm
SSB Noise Figure RF = 1750MHz RF = 1950MHz RF = 2150MHz
9.2 9.8
10.4
dB dB dB
SSB Noise Figure Under Blocking fRF = 1950MHz, fLO = 2140MHz, fBLOCK = 1850MHz PBLOCK = 5dBm PBLOCK = 10dBm
16.5 22.7
dB dB
2LO-2RF Output Spurious Product (fRF = fLO – fIF/2)
fRF = 2045MHz at –10dBm, fLO = 2140MHz, fIF = 190MHz
–68 dBc
3LO-3RF Output Spurious Product (fRF = fLO – fIF/3)
fRF = 2076.67MHz at –10dBm, fLO = 2140MHz, fIF = 190MHz
–75 dBc
Input 1dB Compression RF = 1950MHz, VCCIF = 3.3V RF = 1950MHz, VCCIF = 5V
10.6 14.0
dBm dBm
High Side LO Downmixer Application: ISEL = Low, RF = 1600MHz to 2300MHz, IF = 190MHz, fLO = fRF + fIF
-
LTC5592
55592fa
For more information www.linear.com/LTC5592
RF FREQUENCY (MHz)1900
35
ISOL
ATIO
N (d
B)
45
2300
5592 G03
40
2100 2500 2700
55
50
–40°C25°C85°C
Conversion Gain and IIP3 vs RF Frequency SSB NF vs RF Frequency Channel Isolation vs RF Frequency
1950MHz Conversion Gain, IIP3 and NF vs LO Power
2350MHz Conversion Gain, IIP3 and NF vs LO Power
2550MHz Conversion Gain, IIP3 and NF vs LO Power
Low Side LOTypical ac perForMance characTerisTicsVCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests, ∆f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
Conversion Gain, IIP3 and NF vs Supply Voltage (Single Supply)
Conversion Gain, IIP3 and NF vs Supply Voltage (Dual Supply)
Conversion Gain, IIP3 and RF Input P1dB vs Temperature
RF FREQUENCY (MHz)15006
8
10
IIP3
(dBm
) GC (dB)
14
16
18
24
22
20
1700 2100
5592 G01
12
1900 2300 2500 2700
28
26
6
7
8
10
11
12
15
14
13
9
17
16
GC
IIP3
–40°C25°C85°C
105°C
6
7
8
SSB
NF (d
B)10
11
12
15
14
13
5592 G02
9
16
RF FREQUENCY (MHz)1500 1700 21001900 2300 2500 2700
–40°C25°C85°C
105°C
LO INPUT POWER (dBm)–6
6
8
10
G C (d
B), I
IP3
(dBm
)
SSB NF (dB)
14
16
18
24
22
20
26
–4 0
5592 G04
12
–2 2 4 6
28
0
8
12
16
4
20
2
10
14
18
6
22
–40°C25°C85°C
NF
GC
IIP3
LO INPUT POWER (dBm)–6
6
8
10
G C (d
B), I
IP3
(dBm
)SSB NF (dB)
14
16
18
24
22
20
26
–4 0
5592 G05
12
–2 2 4 6
28
0
8
12
16
4
20
2
10
14
18
6
22
–40°C25°C85°C
GC
NF
IIP3
LO INPUT POWER (dBm)–6
6
8
10
G C (d
B), I
IP3
(dBm
)
SSB NF (dB)
14
16
18
24
22
20
26
–4 0
5592 G06
12
–2 2 4 6
28
0
8
12
16
4
20
2
10
14
18
6
22
–40°C25°C85°C
IIP3
GC
NF
VCCIF SUPPLY VOLTAGE (V)3
68
10
G C (d
B), I
IP3
(dBm
)SSB NF (dB)
14
1618
24
22
20
26
3.5 4.5
5592 G08
12
4 5 5.5
3028
0
8
12
16
4
20
2
10
14
18
6
24
22
–40°C25°C85°C
IIP3
GC
NFRF = 2350MHzVCC = 3.3V
CASE TEMPERATURE (°C)–40
68
10G C (d
B), I
IP3
(dBm
), P1
dB (d
Bm)
14
16
18
24
22
20
26
–10 50
5592 G09
12
20 80 110
3028
IIP3
P1dB
GC
VCCIF = 3.3VVCCIF = 5V
RF = 2350MHz
VCC, VCCIF SUPPLY VOLTAGE (V)3
6
8
10
G C (d
B), I
IP3
(dBm
)
SSB NF (dB)
14
16
18
24
22
20
26
3.1 3.3
5592 G07
12
3.2 3.4 3.5 3.6
28
0
8
12
16
4
20
2
10
14
18
6
22
–40°C25°C85°C
GC
NF
IIP3
RF = 2350MHzVCC = VCCIF
-
LTC5592
65592fa
For more information www.linear.com/LTC5592
SSB Noise Figure vs RF Blocker Power LO Leakage vs LO Frequency RF Isolation vs RF Frequency
Conversion Gain Distribution IIP3 Distribution SSB Noise Figure Distribution
2-Tone IF Output Power, IM3 and IM5 vs RF Input Power
Single-Tone IF Output Power, 2 × 2 and 3 × 3 Spurs vs RF Input Power
2 × 2 and 3 × 3 Spur Suppression vs LO Input Power
Low Side LOTypical ac perForMance characTerisTicsVCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests, ∆f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
RF FREQUENCY (MHz)15000
10
20
ISOL
ATIO
N (d
B)
30
50
60
40
1700 21001900 2300
5592 G15
2500 2700
70
RF-IF
RF-LO
GAIN (dB)7.5
0
5
10
DIST
RIBU
TION
(%)
15
25
20
8 8.5
5592 G16
9
RF = 2350MHz
85°C25°C–40°C
NOISE FIGURE (dB)7
0
15
10
5
20
DIST
RIBU
TION
(%)
25
35
30
8 109
5592 G18
1211
50
40
45RF = 2350MHz85°C
25°C–40°C
RF INPUT POWER (dBm/TONE)–12
–80
–70
–50
–60OUTP
UT P
OWER
(dBm
/TON
E)
–40
–30
–20
–10
10
0
–9 –3 0
5592 G10
–6 3 6
20
IFOUT
RF1 = 2349MHzRF2 = 2351MHzLO = 2160MHz
IM5IM3
RF INPUT POWER (dBm)–12
–80
–70
–60
OUTP
UT P
OWER
(dBm
)–40
–30
0
–10
–20
10
–9 –3
5592 G11
–50
–6 0 3 6
20IFOUT(RF = 2350MHz)
LO = 2160MHz
3RF-3LO(RF = 2223.33MHz)
2RF-2LO(RF = 2255MHz)
LO INPUT POWER (dBm)–6
–85
–80
RELA
TIVE
SPU
R LE
VEL
(dBc
)
–75
–65
–70
–3 0
5592 G12
3 6
–55
–60
IF = 190MHzPRF = –10dBmLO = 2160MHz
3RF-3LO(RF = 2223.33MHz)
2RF-2LO(RF = 2255MHz)
IIP3 (dBm)24.50
15
10
5
20
DIST
RIBU
TION
(%)
25
35
30
25.5 27.526.5
5592 G17
28.5
40RF = 2350MHz
85°C25°C–40°C
RF BLOCKER POWER (dBm)–20
8
10
12
14SSB
NF
(dB)
16
22
20
18
–15 –5–10 0
5592 G13
5 10
24PLO = –3dBmPLO = 0dBmPLO = 3dBmPLO = 6dBm
RF = 2400MHzBLOCKER = 2500MHz
LO FREQUENCY (MHz)1500
–50
–40
LO L
EAKA
GE (d
Bm)
–30
–10
–20
1700 1900 2100
5592 G14
25002300
0
LO-IF
LO-RF
-
LTC5592
75592fa
For more information www.linear.com/LTC5592
Typical ac perForMance characTerisTics
Conversion Gain and IIP3 vs RF Frequency SSB NF vs RF Frequency
2-Tone IF Output Power, IM3 and IM5 vs RF Input Power
1950MHz Conversion Gain, IIP3 and NF vs LO Power
2350MHz Conversion Gain, IIP3 and NF vs LO Power
2550MHz Conversion Gain, IIP3 and NF vs LO Power
Low Power Mode, Low Side LOVCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = High, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests, ∆f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
Conversion Gain, IIP3 and NF vs Supply Voltage (Single Supply)
Conversion Gain, IIP3 and NF vs Supply Voltage (Dual Supply)
Conversion Gain, IIP3 and RF Input P1dB vs Temperature
6
8
7
NOIS
E FI
GURE
(dB)
10
9
12
11
14
13
5592 G20
16
15
RF FREQUENCY (MHz)1500 1700 21001900 2300 2500 2700
–40°C25°C85°C
105°C
5
7
9
IIP3
(dBm
) GC (dB)
13
15
17
23
21
19
5592 G19
11
25
5
9
11
13
7
15
6
10
12
14
8GC
RF FREQUENCY (MHz)1500 1700 21001900 2300 2500 2700
–40°C25°C85°C
105°C
IIP3
LO INPUT POWER (dBm)–6
5
7
9
G C (d
B), I
IP3
(dBm
)
SSB NF (dB)13
15
17
25
23
21
19
–4 0
5592 G22
11
–2 2 4 6
8
12
16
4
20
0
2
10
14
18
6
IIP3
GC
NF
–40°C25°C85°C
VCC, VCCIF SUPPLY VOLTAGE (V)3
5
7
9
11GC
(dB)
, IIP
3 (d
Bm)
SSB NF (dB)
15
17
19
25
23
21
3.1 3.3
5592 G25
13
3.2 3.4 3.5 3.6
8
12
16
4
20
0
2
10
14
18
6–40°C25°C85°C
IIP3
GC
NF
VCC = VCCIFRF = 2350MHz
LO INPUT POWER (dBm)–6
5
7
9
G C (d
B), I
IP3
(dBm
)SSB NF (dB)13
15
17
25
23
21
19
–4 0
5592 G23
11
–2 2 4 6
8
12
16
4
20
0
2
10
14
18
6–40°C25°C85°C
IIP3
GC
NF
LO INPUT POWER (dBm)–6
5
9
7
11GC
(dB)
, IIP
3 (d
Bm)
SSB NF (dB)
15
17
19
25
23
21
–4 0
5592 G24
13
–2 2 4 6
8
12
16
4
20
0
2
10
14
18
6–40°C25°C85°C
IIP3
GC
NF
VCCIF SUPPLY VOLTAGE (V)3
5
7
9
11GC
(dB)
, IIP
3 (d
Bm)
SSB NF (dB)
15
17
19
25
23
21
3.5
5592 G26
13
4 4.5 5 5.5
8
12
16
4
20
0
2
10
14
18
6–40°C25°C85°C
IIP3
GC
NF
VCC = 3.3VRF = 2350MHz
CASE TEMPERATURE (°C)–40
5
7
9
11
G C (d
B), I
IP3
(dBm
), P1
dB (d
Bm)
15
17
19
25
23
21
–10 50
5592 G27
13
20 80 110
VCCIF = 3.3VVCCIF = 5V
GC
P1dB
IIP3
RF = 2350MHz
RF INPUT POWER (dBm/TONE)–12
–80
–60
–40
–20
OUTP
UT P
OWER
(dBm
/TON
E)
–9 –3
5592 G21
–6 0 3 6
20
0
IM5
IFOUT
RF1 = 2349MHzRF2 = 2351MHzLO = 2160MHz
IM3
-
LTC5592
85592fa
For more information www.linear.com/LTC5592
Typical ac perForMance characTerisTics
Conversion Gain and IIP3 vs RF Frequency SSB NF vs RF Frequency Channel Isolation vs RF Frequency
1750MHz Conversion Gain, IIP3 and NF vs LO Power
1950MHz Conversion Gain, IIP3 and NF vs LO Power
2150MHz Conversion Gain, IIP3 and NF vs LO Power
High Side LOVCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests, ∆f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
Conversion Gain, IIP3 and NF vs Supply Voltage (Single Supply)
Conversion Gain, IIP3 and NF vs Supply Voltage (Dual Supply)
Conversion Gain, IIP3 and RF Input P1dB vs Temperature
RF FREQUENCY (MHz)1600
8
6
10
12
IIP3
(dBm
) GC (dB)16
18
20
26
28
24
22
1700 1900
5592 G28
14
6
7
8
10
11
12
15
16
17
14
13
9
1800 2000 2100 23002200
IIP3
GC
–40°C25°C85°C
105°C
LO INPUT POWER (dBm)–6
G C (d
B), I
IP3
(dBm
)
SSB NF (dB)
–4 0
5592 G31
6
14
12
10
8
20
18
16
22
26
28
24
0
4
2
8
6
12
10
20
18
22
IIP316
14
–2 2 4 6
–40°C25°C85°C
GC
NF
LO INPUT POWER (dBm)–6
G C (d
B), I
IP3
(dBm
)SSB NF (dB)
–4 0
5592 G32
6
10
8
14
12
16
18
24
26
28
22
20
0
2
4
8
6
12
10
20
18
22
IIP316
14
–2 2 4 6
–40°C25°C85°C
GC
NF
LO INPUT POWER (dBm)–6
G C (d
B), I
IP3
(dBm
)
SSB NF (dB)
–4 0
5592 G33
6
12
10
8
16
14
18
22
20
26
28
24
0
2
4
8
6
12
10
20
18
22
IIP316
14
–2 2 4 6
–40°C25°C85°C
NF
GC
VCC, VCCIF SUPPLY VOLTAGE (V)3
G C (d
B), I
IP3
(dBm
)
SSB NF (dB)
3.1 3.2
5592 G34
6
8
10
12
16
14
18
26
24
28
22
20
0
2
8
6
4
12
10
18
20
22
IIP316
14
3.3 3.4 3.5 3.6
–40°C25°C85°C
GC
NF
VCC = VCCIFRF = 1950MHz
VCCIF SUPPLY VOLTAGE (V)3
G C (d
B), I
IP3
(dBm
)SSB NF (dB)
3.5
5592 G35
6
10
8
14
12
16
18
26
24
28
20
22
0
2
6
4
8
12
10
20
18
22
IIP316
14
4 4.5 5 5.5
–40°C25°C85°C
NF
GCVCC = 3.3V
RF = 1950MHz
CASE TEMPERATURE (°C)–40
G C (d
B), I
IP3
(dBm
), P1
dB (d
Bm)
–10
5592 G36
6
8
12
10
14
18
16
26
24
28
20
22IIP3
20 50 80 110
VCCIF = 3.3VVCCIF = 5V
GC
P1dB
RF = 1950MHz
RF FREQUENCY (MHz)1600
SSB
NF (d
B)
1700 1900
5592 G29
6
7
8
10
11
12
15
16
14
13
9
1800 2000 2100 23002200
–40°C25°C85°C
105°C
RF FREQUENCY (MHz)1600
ISOL
ATIO
N (d
B)
1700 1900
5592 G30
35
40
50
55
70
65
60
45
1800 2000 2100 23002200
–40°C25°C85°C
-
LTC5592
95592fa
For more information www.linear.com/LTC5592
Typical Dc perForMance characTerisTics
VCC Supply Current vs Supply Voltage (Mixer + LO Amplifier)
VCCIF Supply Current vs Supply Voltage (IF Amplifier)
Total Supply Current vs Temperature (VCC + VCCIF)
VCC Supply Current vs Supply Voltage (Mixer + LO Amplifier)
VCCIF Supply Current vs Supply Voltage (IF Amplifier)
Total Supply Current vs Temperature (VCC + VCCIF)
ISEL = High, ENA = ENB = High, test circuit shown in Figure 1.
ISEL = Low, ENA = ENB = High, test circuit shown in Figure 1.
VCC SUPPLY VOLTAGE (V)3
SUPP
LY C
URRE
NT (m
A)
3.1
5592 G37
190
192
194
198
200
202
204
196
206
3.2 3.3 3.4 3.5 3.6
105°C 85°C
25°C
–40°C
VCCIF = VCC
VCCIF SUPPLY VOLTAGE (V)3
SUPP
LY C
URRE
NT (m
A)
3.3
5592 G38
130
150
170
190
210
230
250
270
3.6 3.9 4.2 4.5 4.8 5.1 5.4
VCC = 3.3V105°C
85°C
25°C
–40°C
CASE TEMPERATURE (°C)–40
SUPP
LY C
URRE
NT (m
A)
–10
5592 G39
280
300
320
340
360
440
420
400
380
460
480
20 50 80 110
VCC = 3.3V, VCCIF = 5V(DUAL SUPPLY)
VCC = VCCIF = 3.3V(SINGLE SUPPLY)
VCC SUPPLY VOLTAGE (V)3
SUPP
LY C
URRE
NT (m
A)
3.1
5592 G40
124
126
128
130
132
134
136
3.2 3.3 3.4 3.5 3.6
105°C
85°C
25°C
–40°C
VCCIF = VCC
CASE TEMPERATURE (°C)–40
SUPP
LY C
URRE
NT (m
A)
–10
5592 G42
210
250
240
230
220
260
280
270
290
300
20 50 80 110
VCC = 3.3V, VCCIF = 5V(DUAL SUPPLY)
VCC = VCCIF = 3.3V(SINGLE SUPPLY)
VCCIF SUPPLY VOLTAGE (V)3
SUPP
LY C
URRE
NT (m
A)
3.3
5592 G41
80
110
100
90
130
120
140
160
150
170
3.6 3.9 4.2 4.5 4.8 5.1 5.4
VCC = 3.3V
105°C
85°C
25°C
–40°C
pin FuncTionsRFA, RFB (Pins 1, 6): Single-Ended RF Inputs for Chan-nels A and B. These pins are internally connected to the primary sides of the RF input transformers, which have low DC resistance to ground. Series DC-blocking capaci-tors should be used to avoid damage to the integrated transformer when DC voltage is present at the RF inputs. The RF inputs are impedance matched when the LO input is driven with a 0±6dBm source between 1.5GHz and 2.5GHz and the channels are enabled.
CTA, CTB (Pins 2, 5): RF Transformer Secondary Center-Tap on Channels A and B. These pins may require bypass capacitors to ground to optimize IIP3 performance. Each pin has an internally generated bias voltage of 1.2V and must be DC-isolated from ground and VCC.
GND (Pins 3, 4, 7, 13, 15, 24, Exposed Pad Pin 25): Ground. These pins must be soldered to the RF ground plane on the circuit board. The exposed pad metal of the package provides both electrical contact to ground and good thermal contact to the printed circuit board.
-
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105592fa
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pin FuncTionsIFGNDB, IFGNDA (Pins 8, 23): DC Ground Returns for the IF Amplifiers. These pins must be connected to ground to complete the DC current paths for the IF amplifiers. Chip inductors may be used to tune LO-IF and RF-IF leakage. Typical DC current is 101mA for each pin.
IFB+, IFB–, IFA–, IFA+ (Pins 9, 10, 21, 22): Open-Collector Differential Outputs for the IF Amplifiers of Channels B and A. These pins must be connected to a DC supply through impedance matching inductors, or transformer center-taps. Typical DC current consumption is 50.5mA into each pin.
IFBB, IFBA (Pins 11, 20): Bias Adjust Pins for the IF Amplifiers. These pins allow independent adjustment of the internal IF buffer currents for channels B and A, respectively. The typical DC voltage on these pins is 2.2V. If not used, these pins must be DC isolated from ground and VCC.
VCCB and VCCA (Pins 12, 19): Power Supply Pins for the LO Buffers and Bias Circuits. These pins must be con-nected to a regulated 3.3V supply with bypass capacitors located close to the pins. Typical current consumption is 99.5mA per pin.
block DiagraM
5592 BD
BIAS
BIAS
GND
ENA
ISEL
LO
VCCBIFBB
VCCAIFBA
IFB–IFB+
IFA–IFA+
IFGNDB
IFGNDA
GND
RFB
LOAMP
LOAMP
ENB
GND
IFAMP
11109 12
14
13
GND 15
16
17
18
6
87
CTB5
GND4
GND3
CTA2
RFA1
IFAMP
22 21 20 192324
ENB, ENA (Pins 14, 17): Enable Pins. These pins allow Channels B and A, respectively, to be independently en-abled. An applied voltage of greater than 2.5V activates the associated channel while a voltage of less than 0.3V disables the channel. Typical input current is less than 10μA. These pins must not be allowed to float.
LO (Pin 16): Single-Ended Local Oscillator Input. This pin is internally connected to the primary side of the LO input transformer and has a low DC resistance to ground. Series DC-blocking capacitors should be used to avoid damage to the integrated transformer when DC voltage present at LO input. The LO input is internally matched to 50Ω for all states of ENA and ENB.
ISEL (Pin 18): Low Power Select Pin. When this pin is pulled low (
-
LTC5592
115592fa
For more information www.linear.com/LTC5592
TesT circuiT
L1, L2 vs IF FREQUENCIES
IF (MHz) L1, L2 (nH)
140 270
190 150
240 100
300 56
380 33
450 22
REF DES VALUE SIZE VENDOR
C1A, C1B 22pF 0402 AVX
C2 2.2pF 0402 AVX
C3A, C3B C5A, C5B
22pF 0402 AVX
C4, C6 1µF 0603 AVX
C7A, C7B 1000pF 0402 AVX
C8A, C8B 4.7pF 0402 AVX
L1A, L1B L2A, L2B
150nH 0603 Coilcraft
T1A, T1B TC4-1W-7ALN+ Mini-Circuits
Figure 1. Standard Downmixer Test Circuit Schematic (190MHz IF)
RF
GND
GND
BIAS
DC1710AEVALUATION BOARDSTACK-UP(NELCO N4000-13)
0.015”
0.015”
0.062”
4:1T1A
IFA50Ω
C7A
L2AL1A
C5AC6
C3A C4
LTC5592
25GND
1
192021222324
121110987
LO50Ω
17
18
16
15
14
C2
5
6 13
4
3
RFA50Ω
VCCIF3.3V TO 5V
C1A
C8A
RFB50Ω
C1B
2
IFGNDAGND IFA+ IFA– IFBA
LO
GND
GND
ISEL
ENB
ENA
VCCA
IFGNDBGND IFB+ IFB– IFBB VCCB
RFA
CTA
GND
GND
CTB
RFB
5592 TC01
4:1T1B
IFB50Ω
C5B
C3B
C7B
L1BL2B
ISEL(0V/3.3V)
VCC3.3V
ENA(0V/3.3V)
ENB(0V/3.3V)
C8B
-
LTC5592
125592fa
For more information www.linear.com/LTC5592
Introduction
The LTC5592 consists of two identical mixer channels driven by a common LO input signal. Each high linearity mixer consists of a passive double-balanced mixer core, IF buffer amplifier, LO buffer amplifier and bias/enable circuits. See the Pin Functions and Block Diagram sections for a description of each pin. Each of the mixers can be shutdown independently to reduce power consumption and low current mode can be selected that allows a trade-off between performance and power consumption. The RF and LO inputs are single-ended and are internally matched to 50Ω. Low side or high side LO injection can be used. The IF outputs are differential. The evaluation circuit, shown in Figure 1, utilizes bandpass IF output matching and an IF transformer to realize a 50Ω single-ended IF output. The evaluation board layout is shown in Figure 2.
applicaTions inForMaTion
Figure 2. Evaluation Board Layout (DC1710A)
The secondary winding of the RF transformer is inter-nally connected to the channel A passive mixer core. The center-tap of the transformer secondary is connected to Pin 2 (CTA) to allow the connection of bypass capacitor, C8A. The value of C8A can be adjusted to improve channel isolation at specific RF frequencies with minor impact to conversion gain, linearity and noise performance. When used, it should be located within 2mm of Pin 2 for proper high frequency decoupling. The nominal DC voltage on the CTA pin is 1.2V.
For the RF inputs to be properly matched, the appropriate LO signal must be applied to the LO input. A broadband input match is realized with C1A = 22pF. The measured input return loss is shown in Figure 4 for LO frequencies of 1.7GHz, 2.16GHz and 2.5GHz. As shown in Figure 4, the RF input impedance is dependent on LO frequency, although a single value of C1A is adequate to cover the 1.7GHz to 2.5GHz RF band.
RF Inputs
The RF inputs of channels A and B are identical. The RF input of channel A, shown in Figure 3, is connected to the primary winding of an integrated transformer. A 50Ω match is realized when a series external capacitor, C1A, is con-nected to the RF input. C1A is also needed for DC blocking if the source has DC voltage present, since the primary side of the RF transformer is internally DC-grounded. The DC resistance of the primary is approximately 3.9Ω.
Figure 3. Channel A RF Input Schematic
Figure 4. RF Port Return Loss
5592 F02
LTC5592
C1A
C8A
RFA
CTA
RFA
TO CHANNEL A MIXER
1
2
5592 F03
FREQUENCY (MHz)1500
–25
–20
RETU
RN L
OSS
(dB)
–15
–10
0
–5
1700
5592 F04
1900 2100 2300 2500 2700
LO = 1700MHzLO = 2160MHzLO = 2500MHz
-
LTC5592
135592fa
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The RF input impedance and input reflection coefficient, versus RF frequency, are listed in Table 1. The reference plane for this data is Pin 1 of the IC, with no external matching, and the LO is driven at 2.16GHz.
Table 1. RF Input Impedance and S11 (at Pin 1, No External Matching, fLO = 2.16GHz)
FREQUENCY (GHz)
RF INPUT IMPEDANCE
S11
MAG ANGLE
1.6 66.0 + j6.8 0.15 20
1.7 62.4 + j0.5 0.11 2
1.8 57.9 – j3.8 0.08 –24
1.9 53.2 – j6.1 0.07 –59
2.0 48.5 – j8.8 0.09 –95
2.1 40.6 – j9.3 0.14 –130
2.2 35.0 – j0.1 0.18 –180
2.3 39.3 + j3.7 0.13 –201
2.4 41.2 + j3.9 0.11 –207
2.5 41.7 + j4.3 0.10 –211
2.6 42.8 + j4.1 0.09 –212
2.7 44.1 + j3.6 0.07 –213
applicaTions inForMaTion
Figure 5. LO Input Schematic
LO Input
The LO input, shown in Figure 5, is connected to the primary winding of an integrated transformer. A 50Ω impedance match is realized at the LO port by adding an external series capacitor, C2. This capacitor is also needed for DC blocking if the LO source has DC voltage present, since the primary side of the LO transformer is DC-grounded internally. The DC resistance of the primary is approximately 1.8Ω.
The secondary of the transformer drives a pair of high speed limiting differential amplifiers for channels A and B. The LTC5592’s LO amplifiers are optimized for the 1.7GHz to 2.5GHz LO frequency range; however, LO frequencies outside this frequency range may be used with degraded performance.
The LO port is always 50Ω matched when VCC is applied, even when one or both of the channels is disabled. This helps to reduce frequency pulling of the LO source when the mixer is switched between different operating states. Figure 6 illustrates the LO port return loss for the different operating modes.
Figure 6. LO Input Return Loss
The nominal LO input level is 0dBm, though the limiting amplifiers will deliver excellent performance over a ±6dBm input power range. Table 2 lists the LO input impedance and input reflection coefficient versus frequency.
Table 2. LO Input Impedance vs Frequency(at Pin 16, No External Matching, ENA = ENB = High)
FREQUENCY (GHz)
INPUT IMPEDANCE
S11
MAG ANGLE
1.7 46.4 + j34.4 0.34 76
1.8 47.0 + j31.0 0.31 78
1.9 46.5 + J28.2 0.28 81
2.0 44.4 + J26.8 0.28 86
2.1 43.1 + j26.0 0.28 89
2.2 41.8 + j26.2 0.29 91
2.3 40.4 + j27.4 0.31 92
2.4 38.8 + j28.5 0.33 94
2.5 38.0 + j30.4 0.35 93
FREQUENCY (MHz)1300 17001500
–30
–20
–25
RETU
RN L
OSS
(dB)
–15
–10
0
–5
5592 F06
1900 2100 2300 2500
BOTH CHANNELS ONONE CHANNEL ONBOTH CHANNELS OFF
LO
TOMIXER B
LTC5592ISEL
5592 F05
18
LO16
17ENA
ENB
C2
14
BIAS
BIAS
TOMIXER A
-
LTC5592
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For more information www.linear.com/LTC5592
IF Outputs
The IF amplifiers in channels A and B are identical. The IF amplifier for channel A, shown in Figure 7, has differen-tial open collector outputs (IFA+ and IFA–), a DC ground return pin (IFGNDA), and a pin for adjusting the internal bias (IFBA). The IF outputs must be biased at the sup-ply voltage (VCCIFA), which is applied through matching inductors L1A and L2A. Alternatively, the IF outputs can be biased through the center tap of a transformer (T1A). The common node of L1A and L2A can be connected to the center tap of the transformer. Each IF output pin draws approximately 50.5mA of DC supply current (101mA total). An external load resistor, R2A, can be used to improve impedance matching if desired.
IFGNDA (Pin 23) must be grounded or the amplifier will not draw DC current. Inductor L3A may improve LO-IF and RF-IF leakage performance in some applications, but is otherwise not necessary. Inductors should have small resistance for DC. High DC resistance in L3A will reduce the IF amplifier supply current, which will degrade RF performance.
applicaTions inForMaTionFor optimum single-ended performance, the differential IF output must be combined through an external IF transformer or a discrete IF balun circuit. The evaluation board (see Figures 1 and 2) uses a 4:1 IF transformer for impedance transformation and differential to single-ended conversion. It is also possible to eliminate the IF transformer and drive differential filters or amplifiers directly.
The IF output impedance can be modeled as 379Ω in parallel with 2.2pF. The equivalent small-signal model, including bondwire inductance, is shown in Figure 8. Frequency-dependent differential IF output impedance is listed in Table 3. This data is referenced to the package pins (with no external components) and includes the ef-fects of IC and package parasitics.
Figure 7. IF Amplifier Schematic with Bandpass Match
Figure 8. IF Output Small-Signal Model
Bandpass IF Matching
The bandpass IF matching configuration, shown in Figures 1 and 7, is best suited for IF frequencies in the 90MHz to 500MHz range. Resistor R2A may be used to reduce the IF output resistance for greater bandwidth and inductors L1A and L2A resonate with the internal IF output capacitance at the desired IF frequency. The value of L1A, L2A can be estimated as follows:
L1A =L2A = 12πfIF( )2 • 2 •CIF
where CIF is the internal IF capacitance (listed in Table 3).
22 21IFA+ IFA–
0.9nH0.9nHRIF
CIF
LTC5592
5592 F08
4:1T1A IFA
C7AL2AL1A
C5A
R2A
L3A (OR SHORT)VCCIFA
20212223
IFAMP
BIAS
101mA
4mA
IFBA
VCCA
LTC5592IGNDA
IFA–IFA+
R1A(OPTION TO
REDUCEDC POWER)
5592 F07
-
LTC5592
155592fa
For more information www.linear.com/LTC5592
Values of L1A and L2A are tabulated in Figure 1 for vari-ous IF frequencies. The measured IF output return loss for bandpass IF matching is plotted in Figure 9.
Table 3. IF Output Impedance vs Frequency
FREQUENCY (MHz)DIFFERENTIAL OUTPUT
IMPEDANCE (RIF || XIF (CIF))
90 403 || – j610 (2.9pF)
140 384 || – j474 (2.4pF)
190 379 || – j381 (2.2pF)
240 380 || – j316 (2.1pF)
300 377 || – j253 (2.1pF)
380 376 || – j210 (2.0pF)
450 360 || – j177 (2.0pF)
applicaTions inForMaTion
Figure 9. IF Output Return Loss with Bandpass Matchingboard (see Figure 2) has been laid out to accommodate this matching topology with only minor modifications.
IF Amplifier Bias
The IF amplifier delivers excellent performance with VCCIF = 3.3V, which allows a single supply to be used for VCC and VCCIF. At VCCIF = 3.3V, the RF input P1dB of the mixer is limited by the output voltage swing. For higher P1dB, in this case, resistor R2A (Figure 7) can be used to reduce the output impedance and thus the voltage swing, thus improving P1dB. The trade-off for improved P1dB will be lower conversion gain.
With VCCIF increased to 5V the P1dB increases by over 3dB, at the expense of higher power consumption. Mixer P1dB performance at 1950MHz and 2350MHz is tabulated in Table 4 for VCCIF values of 3.3V and 5V. For the highest conversion gain, high-Q wire-wound chip inductors are recommended for L1A and L2A. Low cost multilayer chip inductors may be substituted, with a slight reduction in conversion gain.
Figure 10. IF Output with Lowpass Matching
Figure 11. IF Output Return Loss with Lowpass Matching
Lowpass IF Matching
For IF frequencies below 90MHz, the inductance values become unreasonably high and the lowpass topology shown in Figure 10 is preferred. This topology also can provide improved RF to IF and LO to IF isolation. VCCIFA is supplied through the center tap of the 4:1 transformer. A lowpass impedance transformation is realized by shunt elements R2A and C9A (in parallel with the internal RIF and CIF), and series inductors L1A and L2A. Resistor R2A is used to reduce the IF output resistance for greater bandwidth, or it can be omitted for the highest conver-sion gain. The final impedance transformation to 50Ω is realized by transformer T1A. The measured return loss is shown in Figure 11 for different values of inductance (C9A = open). The case with 82nH inductors and a 1k load resistor (R2A) is also shown. The LTC5592 demo
4:1
T1A IFA50ΩVCCIFA
3.1 TO 5.3V
C5A
2122IFA–IFA+
C6
C9A
R2AL1A L2A
LTC5592
5592 F10
FREQUENCY (MHz)50
–25
–20
RETU
RN L
OSS
(dB)
–15
–10
0
–5
100 300
5592 F09
150 200 250 350 400 450 500
270nH150nH
100nH
56nH
33nH
22nH
RETU
RN L
OSS
(dB)
–20
–25
–15
–10
0
–5
FREQUENCY (MHz)500 100 150
5592 F11
200 250
68nH
100nH
180nH
82nH + 1k
-
LTC5592
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For more information www.linear.com/LTC5592
applicaTions inForMaTionTable 4. Performance Comparison with VCCIF = 3.3V and 5V (RF = 1950MHz, High Side LO, IF = 190MHz)
VCCIF (V)
R2A (Ω)
ICCIF (mA)
GC (dB)
P1dB (dBm)
IIP3 (dBm)
NF (dB)
3.3 Open 202 8.7 10.6 25.4 9.8
1k 202 7.5 11.3 25.4 9.9
5 Open 209 8.7 14.0 25.5 9.9
(RF = 2350MHz, Low Side LO, IF = 190MHz)
VCCIF (V)
R2A (Ω)
ICCIF (mA)
GC (dB)
P1dB (dBm)
IIP3 (dBm)
NF (dB)
3.3 Open 202 8.3 11.0 27.3 9.8
1k 202 7.1 11.8 27.5 9.8
5 Open 209 8.1 14.6 28.0 10.0
The IFBA pin (Pin 20) is available for reducing the DC current consumption of the IF amplifier, at the expense of IIP3. The nominal DC voltage at Pin 20 is 2.1V, and this pin should be left open-circuited for optimum performance. The internal bias circuit produces a 4mA reference for the IF amplifier, which causes the amplifier to draw approxi-mately 101mA. If resistor R1A is connected to Pin 20 as shown in Figure 7, a portion of the reference current can be shunted to ground, resulting in reduced IF amplifier current. For example, R1A = 1k will shunt away 1.5mA from Pin 20 and the IF amplifier current will be reduced by 25% to approximately 75.5mA. Table 5 summarizes RF performance versus IF amplifier current.
Table 5. Mixer Performance with Reduced IF Amplifier CurrentRF = 1950MHz, High Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
R1
ICCIF (mA)
GC (dB)
IIP3 (dBm)
P1dB (dBm)
NF (dB)
Open 202 8.7 25.4 10.6 9.8
4.7kΩ 184 8.5 25.2 10.8 9.8
2.2kΩ 170 8.4 24.8 10.9 9.7
1kΩ 151 8.1 24.4 11.1 9.8
RF = 2350MHz, Low Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
R1
ICCIF (mA)
GC (dB)
IIP3 (dBm)
P1dB (dBm)
NF (dB)
Open 202 8.3 27.3 11.0 9.8
4.7kΩ 184 8.1 26.8 11.2 9.8
2.2kΩ 170 8.0 26.2 11.2 9.8
1kΩ 151 7.7 25.4 11.3 9.8
Low Power Mode
Both mixer channels can be set to low power mode us-ing the ISEL pin. This allows flexibility to select a reduced current mode of operation when lower RF performance is acceptable, reducing power consumption by 37%. Figure 12 shows a simplified schematic of the ISEL pin interface. When ISEL is set low (2.5V), the DC current in both channels is reduced, thus reducing power consumption. The performance in low power mode and normal power mode are compared in Table 6.
Figure 12. ISEL Interface Schematic
Table 6. Performance Comparison Between Different Power ModesRF = 1950MHz, High Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
ISEL
ITOTAL (mA)
GC (dB)
IIP3 (dBm)
P1dB (dBm)
NF (dB)
Low 401 8.7 25.4 10.6 9.8
High 252 7.4 21.2 10.9 10.2
RF = 2350MHz, Low Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
ISEL
ITOTAL (mA)
GC (dB)
IIP3 (dBm)
P1dB (dBm)
NF (dB)
Low 401 8.3 27.3 11.0 9.8
High 252 7.1 22.3 11.3 10.2
LTC5592
18ISEL
VCCB
500Ω
VCCA
5592 F13
19
BIAS A
BIAS B
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LTC5592
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For more information www.linear.com/LTC5592
Enable Interface
Figure 13 shows a simplified schematic of the ENA pin interface (ENB is identical). To enable channel A, the ENA voltage must be greater than 2.5V. If the enable function is not required, the enable pin can be connected directly to VCC. The voltage at the enable pin should never exceed the power supply voltage (VCC) by more than 0.3V. If this should occur, the supply current could be sourced through the ESD diode, potentially damaging the IC.
applicaTions inForMaTion
The Enable pins must be pulled high or low. If left float-ing, the on/off state of the IC will be indeterminate. If a three-state condition can exist at the enable pins, then a pull-up or pull-down resistor must be used.
Supply Voltage Ramping
Fast ramping of the supply voltage can cause a current glitch in the internal ESD protection circuits. Depending on the supply inductance, this could result in a supply volt-age transient that exceeds the maximum rating. A supply voltage ramp time of greater than 1ms is recommended.
Spurious Output Levels
Mixer spurious output levels versus harmonics of the RF and LO are tabulated in Tables 7 and 8 for frequencies up to 10GHz. The spur levels were measured on a standard evalution board using the test circuit shown in Figure 1. The spur frequencies can be calculated using the follow-ing equation:
fSPUR = (M • fRF) – (N • fLO)
Table 7. IF Output Spur Levels (dBc), High Side LO(RF = 1950MHz, PRF = –3dBm, PLO = 0dBm, VCC = VCCIF = 3.3V, TC = 25°C)
N
M
0 1 2 3 4 5 6 7 8 90 – –45.2 –46.9 –68.4 –70.8 –75.3 –72.0 –82.01 –51.0 0 –64.4 –54.5 –68.1 –66.3 –74.9 –72.22 –80.0 –80.9 –60.6 * –81.4 * * * *3 * –83.5 * –75.8 * * * * * *4 * * * * * * * * * *5 * * * * * * * * * *6 * * * * * * * * * *7 * * * * * * * * * *8 * * * * * * * * *9 * * * * * * * *
10 * * * * * * **Less than –90dBc
Table 8. IF Output Spur Levels (dBc), Low Side LO(RF = 2350MHz, PRF = –3dBm, PLO = 0dBm, VCC = VCCIF = 3.3V, TC = 25°C)
N
M
0 1 2 3 4 5 6 7 8 90 – –44.9 –46.2 –69.9 –69.7 –78.0 –71.91 –50.7 0 –63.1 –45.7 –67.0 –68.9 –71.1 –72.2 *2 –77.8 –78.7 –66.5 * –89.1 * * * * *3 * * * –70.1 * * * * * *4 * * * * * * * * * *5 * * * * * * * * * *6 * * * * * * * * * *7 * * * * * * * * *8 * * * * * * * *9 * * * * * * *
10 * * * * * **Less than –90dBc
Figure 13. ENA Interface Schematic
LTC5592
17ENA 500Ω
VCCA
5592 F13
19
ESDCLAMP
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LTC5592
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UH Package24-Lead Plastic QFN (5mm × 5mm)
(Reference LTC DWG # 05-08-1747 Rev A)
5.00 ± 0.10
5.00 ± 0.10
NOTE:1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE2. DRAWING NOT TO SCALE3. ALL DIMENSIONS ARE IN MILLIMETERS4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.20mm ON ANY SIDE5. EXPOSED PAD SHALL BE SOLDER PLATED6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE
PIN 1TOP MARK(NOTE 6)
0.55 ± 0.10
23
1
2
24
BOTTOM VIEW—EXPOSED PAD
3.25 REF3.20 ± 0.10
3.20 ± 0.10
0.75 ± 0.05 R = 0.150TYP
0.30 ± 0.05(UH24) QFN 0708 REV A
0.65 BSC
0.200 REF
0.00 – 0.05
0.75 ±0.05
3.25 REF
3.90 ±0.055.40 ±0.05
0.30 ± 0.05
PACKAGE OUTLINE
0.65 BSC
RECOMMENDED SOLDER PAD LAYOUTAPPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
PIN 1 NOTCHR = 0.30 TYPOR 0.35 × 45°
CHAMFERR = 0.05
TYP
3.20 ± 0.05
3.20 ± 0.05
UH Package24-Lead Plastic QFN (5mm × 5mm)
(Reference LTC DWG # 05-08-1747 Rev A)
package DescripTionPlease refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
http://www.linear.com/designtools/packaging/
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
REV DATE DESCRIPTION PAGE NUMBER
A 08/13 Changed LO lower frequency range from 1.7GHz to 1.5GHz.LO Input Frequency Range: changed lower frequency from 1700MHz to 1500MHz.RF Input Frequency Range, Low Side LO: changed lower frequency from 1900MHz to 1600MHz.Updated “Conversion Gain and IIP3 vs RF Frequency” and “SSB NF vs RF Frequency” plots to include 1500MHz frequency characteristics.Updated “LO Leakage vs LO Frequency” plot to include 1500MHz frequency characteristics.Updated “Conversion Gain and IIP3 vs RF Frequency” and “SSB NF vs RF Frequency” plots to include 1500MHz frequency characteristics.Pin Functions section RFA, RFB (Pins 1, 6): Changed LO input source lower frequency from 1.7GHz to 1.5GHz.Right column, last paragraph. Deleted sentence: “These LO frequencies correspond to lower, middle and upper values in the LO range.”Figure 6, updated the LO Input Return Loss plot to include 1300MHz frequency characteristics.
1335
67
912
13
revision hisTory
-
LTC5592
205592fa
For more information www.linear.com/LTC5592 LINEAR TECHNOLOGY CORPORATION 2011
LT 0813 REV A • PRINTED IN USALinear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LTC5592
relaTeD parTs
Typical applicaTionDownconverting Mixer with 470MHz IF
PART NUMBER DESCRIPTION COMMENTSInfrastructureLTC5569 300MHz to 4GHz, 3.3V Dual Active
Downconverting Mixer2dB Gain, 26.7dBm IIP3 and 11.7dB NF at 1950MHz, 3.3V/180mA Supply
LT5557 400MHz to 3.8GHz, 3.3V Downconverting Mixer 2.9dB Gain, 24.7dBm IIP3 and 11.7dB NF at 1950MHz, 3.3V/82mA SupplyLTC6416 2GHz 16-Bit ADC Buffer 40.25dBm OIP3 to 300MHz, Programmable Fast Recovery Output ClampingLTC6412 31dB Linear Analog VGA 35dBm OIP3 at 240MHz, Continuous Gain Range –14dB to 17dBLTC554x 600MHz to 4GHz Downconverting Mixer Family 8dB Gain, >25dBm IIP3, 10dB NF, 3.3V/200mA SupplyLT5554 Ultralow Distort IF Digital VGA 48dBm OIP3 at 200MHz, 2dB to 18dB Gain Range, 0.125dB Gain StepsLT5578 400MHz to 2.7GHz Upconverting Mixer 27dBm OIP3 at 900MHz, 24.2dBm at 1.95GHz, Integrated RF TransformerLT5579 1.5GHz to 3.8GHz Upconverting Mixer 27.3dBm OIP3 at 2.14GHz, NF = 9.9dB, 3.3V Supply, Single-Ended LO and RF PortsRF Power DetectorsLT5581 6GHz Low Power RMS Detector 40dB Dynamic Range, ±1dB Accuracy Over Temperature, 1.5mA Supply CurrentLTC5582 10GHz RMS Power Detector 40MHz to 10GHz, Up to 57dB Dynamic Range, ±0.5dB Accuracy Over TemperatureLTC5583 Dual 6GHz RMS Power Detector 40MHz to 6GHz, Up to 60dB Dynamic Range, >40dB Channel-to-Channel IsolationADCsLTC2285 14-Bit, 125Msps Dual ADC 72.4dB SNR, >88dB SFDR, 790mW Power ConsumptionLTC2185 16-Bit, 125Msps Dual ADC Ultralow Power 74.8dB SNR, 185mW/Channel Power ConsumptionLTC2242-12 12-Bit, 250Msps ADC 65.4dB SNR, 78dB SFDR, 740mW Power Consumption
Conversion Gain, NF and IIP3 vs RF Frequency
RF FREQUENCY (MHz)21006
7
8
9
G C (d
B), S
SB N
F (d
B)
IIP3 (dBm)
11
12
13
14
2200 2400
5592 TA02b
10
2300 2500 2600 2700
23
25
27
29
24
26
28
22
21
TA = 25°CIF = 470MHzLOW SIDE LO
NF
IIP3
GC
4:1TC4-1W-17LN+
IFA50Ω
82nH 82nH
22pF
1nF
1µF
22pF 1µF
LTC5592CHANNEL A
CHANNEL B NOT SHOWN
1
192021222324
LO50Ω
17
18
16
15
2.2pF
4
3
RFA50Ω
VCCIF3.3V
VCC3.3V
TOCHANNEL B
TOCHANNEL B22pF
2
IFGNDAGND IFA+ IFA– IFBA
LO
GND
ISEL
ENA
VCCARFA
CTA
GND
GND
5590 TA02
ISEL
ENA
4.7pF
http://www.linear.com/LTC5569http://www.linear.com/LT5557http://www.linear.com/LTC6416http://www.linear.com/LTC6412http://www.linear.com/LTC5541http://www.linear.com/LT5554http://www.linear.com/LT5578http://www.linear.com/LT5579http://www.linear.com/LT5581http://www.linear.com/LTC5582http://www.linear.com/LTC5583http://www.linear.com/LTC2285http://www.linear.com/LTC2185http://www.linear.com/LTC2242-12
FeaturesApplicationsDescriptionTypical Application Absolute Maximum RatingsPin ConfigurationOrder InformationDC Electrical CharacteristicsAC Electrical CharacteristicsTypical AC Performance CharacteristicsTypical DC Performance CharacteristicsPin FunctionsBlock DiagramTest CircuitApplications InformationPackage DescriptionRevision HistoryTypical ApplicationRelated Parts