low-noise high-speed precision operational-amplifier (rev. e)

OP27A, OP27CLOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS

SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010

1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

� Replacements for ADI, PMI and LTC OP27Series

Features of OP27A and OP27C:� Maximum Equivalent Input Noise Voltage:

3.8 nV/√Hz at 1 kHz5.5 nV/√Hz at 10 kHz

� Very Low Peak-to-Peak Noise Voltage at0.1 Hz to 10 Hz . . . 80 nV Typ

� Low Input Offset VoltageOP27A . . . 25 μV MaxOP27C . . . 100 μV Max

� High Voltage AmplificationOP27A . . . 1 V/μV MinOP27C . . . 0.7 V/μV Min

description

The OP27 operational amplifiers combine out-standing noise performance with excellentprecision and high-speed specifications. Thewideband noise is only 3 nV/√Hz and with the 1/fnoise corner at 2.7 Hz, low noise is maintained forall low-frequency applications.

The outstanding characteristics of the OP27 makethese devices excellent choices for low-noiseamplifier applications requiring precisionperformance and reliability.

The OP27 series is compensated for unity gain.

The OP27A and OP27C are characterized foroperation over the full military temperature rangeof −55°C to 125°C.

AVAILABLE OPTIONS

V max STABLEPACKAGE

TAVIOmaxAT 25°C

STABLEGAIN CERAMIC DIP

(JG)CHIP CARRIER

(FK)

55°C to 125°C25 μV 1 OP27AJG OP27AFK

−55°C to 125°C100 μV 1 OP27CJG —

Copyright © 2010, Texas Instruments IncorporatedPRODUCTION DATA information is current as of publication date.Products conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarily includetesting of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications ofTexas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

1

2

3

4

8

7

6

5

VIOTRIMIN−IN +

VCC −

VIOTRIMVCC +OUTNC

JG PACKAGE(TOP VIEW)

IN+

IN −

OUT

VIO TRIM1 8

6

3

2

symbol

3 2 1 20 19

9 10 11 12 13

4

5

6

7

8

18

17

16

15

14

NCVCC +

NCOUTNC

NC1N−NCIN+NC

FK PACKAGE(TOP VIEW)

NC

NC

NC

NC

NC

NC

NC − No internal connection

CC

−V

Pin numbers are for the JG packages.

IOV

TR

IM

+

−

NC

IOV

TR

IM

OP

27A, O

P27C

LO

W-N

OIS

E H

IGH

-SP

EE

D P

RE

CIS

ION

OP

ER

AT

ION

AL

-AM

PL

IFIE

R

Template R

elease Date: 7−

11−94

SLO

S100E

− F

EB

RU

AR

Y 1989 −

RE

VIS

ED

FE

BR

UA

RY

2010

2P

OS

T O

FF

ICE

BO

X 655303 D

ALLA

S, T

EX

AS

75265•

schematic

IN +

IN −

Q3

Q1A

Q1B Q2B Q2A

Q11

Q12

Q27 Q28

Q26

Q46

Q19

Q20

Q45

Q22

Q24Q23

Q21

Q6

VIO TRIM VIO TRIM

VCC +

OUT

VCC −

480 μA 750μA

260μA

240 μA 120μA

340μA

C1†

† C1 = 120 pF for OP27

OP27A, OP27CLOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER



absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage, VCC+ (see Note 1) 22 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Supply voltage, VCC− (see Note 1) 22 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input voltage, VI VCC±. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Duration of output short circuit unlimited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Differential input current (see Note 2) ±25 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating free-air temperature range: OP27A, OP27C −55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage temperature range −65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: JG or FK package 300°C. . . . . . . . . . . . . .

NOTES: 1. All voltage values are with respect to the midpoint between VCC + and VCC − unless otherwise noted.2. The inputs are protected by back-to-back diodes. Current-limiting resistors are not used in order to achieve low noise. Excessive

input current will flow if a differential input voltage in excess of approximately ±0.7 V is applied between the inputs unless somelimiting resistance is used.

DISSIPATION RATING TABLE

PACKAGETA ≤ 25°C

POWER RATINGDERATING FACTOR

ABOVE TA = 25°CTA = 85°C

POWER RATINGTA = 125°C

POWER RATING

JGFK

1050 mW1375 mW

8.4 mW/°C11.0 mW/°C

546 mW715 mW

210 mW275 mW



4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

recommended operating conditions

OP27A OP27CUNIT

MIN NOM MAX MIN NOM MAXUNIT

Supply voltage, VCC + 4 15 22 4 15 22 V

Supply voltage, VCC − −4 −15 −22 −4 −15 −22 V

Common mode input voltage VVCC ± = ± 15 V, TA = 25°C ± 11 ±11

VCommon-mode input voltage, VIC VCC ± = ± 15 V, TA = − 55°C to 125°C ±10.3 ±10.2V

Operating free-air temperature, TA −55 125 −55 125 °C

electrical characteristics at specified free-air temperature, VCC± = ±15 V (unless otherwise noted)

PARAMETER TEST CONDITIONS T †OP27A OP27C

UNITPARAMETER TEST CONDITIONS TA†

MIN TYP MAX MIN TYP MAXUNIT

V Input offset voltageVO = 0, VIC = 0 25°C 10 25 30 100

VVIO Input offset voltageVO = 0, VIC = 0RS = 50 Ω, See Note 3 Full range 60 300

μV

αVIO

Average temperaturecoefficient of inputoffset voltage

Full range 0.2 0.6 0.4 1.8 μV/°C

Long-term drift of inputoffset voltage

See Note 4 0.2 1 0.4 2 μV/mo

I Input offset current V 0 V 025°C 7 35 12 75

nAIIO Input offset current VO = 0, VIC = 0Full range 50 135

nA

I Input bias current V 0 V 025°C ±10 ±40 ±15 ±80

nAIIB Input bias current VO = 0, VIC = 0Full range ±60 ±150

nA

VCommon-mode input

25°C11to

−11

11to

−11VVICR

Common mode inputvoltage range

Full range10.3

to−10.3

10.5to

−10.5

V

RL ≥ 2 kΩ ±12 ±13.8 ±11.5 ±13.5

VOM Peak output voltage swing RL ≥ 0.6 kΩ ±10 ±11.5 ±10 ±11.5 VVOM Peak output voltage swing

RL ≥ 2 kΩ Full range ±11.5 10.5

V

RL ≥ 2 kΩ, VO = ±10 V 1000 1800 700 1500

Large signal differentialRL ≥ 1 kΩ, VO = ±10 V 800 1500 1500

AVDLarge-signal differentialvoltage amplification RL ≥ 0.6 kΩ, VO = ±1 V,

VCC± = ± 4 V250 700 200 500

V/mV

RL ≥ 2 kΩ, VO = ±10 V Full range 600 300

ri(CM)Common-mode inputresistance

3 2 GΩ

ro Output resistance VO = 0, IO = 0 25°C 70 70 Ω

CMRRCommon-mode rejection VIC = ±11 V 25°C 114 126 100 120

dBCMRRCommon mode rejectionratio VIC = ±10 V Full range 110 94

dB

kSupply voltage rejection VCC ± = ±4 V to ±18 V 25°C 100 120 94 118

dBkSVRSupply voltage rejectionratio VCC ± = ±4.5 V to ±18 V Full range 96 86

dB

† Full range is − 55°C to 125°C.NOTES: 3. Input offset voltage measurements are performed by automatic test equipment approximately 0.5 seconds after applying power.

4. Long-term drift of input offset voltage refers to the average trend line of offset voltage versus time over extended periods after thefirst 30 days of operation. Excluding the initial hour of operation, changes in VIO during the first 30 days are typically 2.5 μV(see Figure 3).




OP27 operating characteristics, VCC± = ±15 V, TA = 25�C

PARAMETER TEST CONDITIONSOP27A OP27C

UNITPARAMETER TEST CONDITIONSMIN TYP MAX MIN TYP MAX

UNIT

SR Slew rate AVD ≥ 1, RL ≥ 2 kΩ 1.7 2.8 1.7 2.8 V/μs

VN(PP)Peak-to-peak equivalentinput noise voltage

f = 0.1 Hz to 10 Hz, RS = 20 Ω,See Figure 26

0.225 0.375 0.225 0.375 μV

V Equivalent input noise voltagef = 10 Hz, RS = 20 Ω 3.5 8 3.8 8

nV/√HVn Equivalent input noise voltagef = 1 kHz, RS = 20 Ω 3 4 3.2 4

nV/√Hz

I Equivalent input noise currentf = 10 Hz, See Figure 27 5 25 5 25

pA/√HIn Equivalent input noise currentf = 1 kHz, See Figure 27 0.7 2.5 0.7 2.5

pA/√Hz

Gain-bandwidth product f = 100 kHz 5 8 5 8 MHz




TYPICAL CHARACTERISTICS

Table of Graphs

FIGURE

VIO Input offset voltage vs Temperature 1

ΔVIO Change in input offset voltagevs Time after power onvs Time (long-term drift)

23

IIO Input offset current vs Temperature 4

IIB Input bias current vs Temperature 5

VICR Common-mode input voltage range vs Supply voltage 6

VOM Maximum peak output voltage vs Load resistance 7

VO(PP) Maximum peak-to-peak output voltage vs Frequency 8

AVD Differential voltage amplificationvs Supply voltagevs Load resistancevs Frequency

910

11, 12

CMRR Common-mode rejection ratio vs Frequency 13

kSVR Supply voltage rejection ratio vs Frequency 14

SR Slew rate vs Temperature 15

φm Phase margin vs Temperature 16

φ Phase shift vs Frequency 11

Vn Equivalent input noise voltage

vs Bandwidthvs Source resistancevs Supply voltagevs Temperaturevs Frequency

1718192021

Gain-bandwidth product vs Temperature 16

IOS Short-circuit output current vs Time 22

ICC Supply current vs Supply voltage 23

Pulse responseSmall signalLarge signal

2425





100

80

60

40

20

0

− 20

− 40

− 60

− 80

− 100− 50 − 25 0 25 50 75 100 125

− In

pu

t O

ffse

t Vo

ltag

e −

V

TA − Free-Air Temperature − °C

INPUT OFFSET VOLTAGE OFREPRESENTATIVE INDIVIDUAL UNITS

vsFREE-AIR TEMPERATURE

VCC ± = ±15 V

10

5

0

WARM-UP CHANGE ININPUT OFFSET VOLTAGE

vsELAPSED TIME

1 2 3 4 5

Time After Power On − minutes

IOμV

ΔV

IO −

Ch

ang

e in

Inp

ut

Off

set

Volt

age

− Vμ

VCC ± = ±15 VTA = 25°C

OP27C

OP27C

OP27AOP27A

OP27COP27A

Figure 1 Figure 2

LONG-TERM DRIFT OF INPUT OFFSET VOLTAGE OFREPRESENTATIVE INDIVIDUAL UNITS

6

2

4

0

− 2

− 4

− 60 1 2 3 4 5 6 7 8

Time − months

0.2-μV/mo Trend Line

0.2-μV/mo Trend Line

ΔV

IO −

Ch

ang

e in

Inp

ut

Off

set

Volt

age

− Vμ

Figure 3





INPUT OFFSET CURRENTvs

FREE-AIR TEMPERATURE

− In

pu

t O

ffse

t C

urr

ent

− n

A


50

40

30

20

10

0− 75 − 50 − 25 0 50 75 100 12525

VCC ± = ±15 V

OP27C

OP27A

INPUT BIAS CURRENTvs



± 50

± 40

± 30

± 20

± 10

0− 50 − 25 0 50 75 100 12525

I IO

− In

pu

t B

ias

Cu

rren

t −

nA

I IB

− 75

OP27C

OP27A

VCC ± = ±15 V

Figure 4 Figure 5

20

COMMON-MODE INPUT VOLTAGE RANGE LIMITSvs

SUPPLY VOLTAGE

0 ±5 ±10 ±15 ±20

VCC + − Supply Voltage − V

VIC

R −

Co

mm

on

-Mo

de

Inp

ut

Volt

age

Ran

ge

Lim

its

− V

TA = −55°C

TA = 125°C

TA = − 55°C

TA = 125°C

TA = 25°C

TA = 25°C

− M

axim

um

Pea

k O

utp

ut

Volt

age

− V

V OM

MAXIMUM PEAK OUTPUT VOLTAGEvs

LOAD RESISTANCE

18

16

14

12

10

8

6

4

2

00.1 1 10

RL − Load Resistance − kΩ

16

12

8

4

0

− 4

− 8

− 12

− 16

VCC ± = ± 15 VTA = 25°C

PositiveSwing

NegativeSwing

ÁÁÁÁÁÁ

VIC

R

Figure 6 Figure 7





1 k

V

OP27MAXIMUM PEAK-TO-PEAK

OUTPUT VOLTAGEvs

FREQUENCY

OP

P −

Max

imu

m P

eak-

to-P

eak

Ou

tpu

t Vo

ltag

e −

V 28

24

20

16

12

8

4

10 k 100 k 1 M 10 Mf − Frequency − Hz

0

ÁÁÁÁÁÁÁÁ

V O(P

P)

VCC ± = ± 15 VRL = 1 kΩTA = 25°C

Figure 8.

24002500

10

OP27ALARGE-SIGNAL

DIFFERENTIAL VOLTAGE AMPLIFICATIONvs

TOTAL SUPPLY VOLTAGE

A

OP27ALARGE-SIGNAL


LOAD RESISTANCE

VD

− D

iffe

ren

tial

Vo

ltag

e A

mp

lific

atio

n −

V/m

V

AV

D −

Dif

fere

nti

al V

olt

age

Am

plif

icat

ion

− V

/mV

0.1 1 10 100RL − Load Resistance − kΩVCC + − VCC − − Total Supply Voltage − V

0 20 30 40 50

2000

1500

1000

500

0

2200

2000

1800

1600

1400

1200

1000

800

600

400

VO = ± 10 VTA = 25°C

RL = 1 kΩ

VCC ± = ± 15 VVO = ± 10 VTA = 25°C

RL = 2 kΩ

Figure 9 Figure 10





1

OP27LARGE-SIGNAL DIFFERENTIAL

VOLTAGE AMPLIFICATION AND PHASE SHIFTvs

FREQUENCY25

20

15

10

5

0

− 5

10 100f − Frequency − Hz

− 10

− D

iffe

ren

tial

Vo

ltag

e A

mp

lific

atio

n −

dB

AV

D

80°

100°

120°

140°

160°

180°

200°

220°

Phase Shift

AVD

φ m = 70°

VCC ± = ±15 VRL = 1 kΩTA = 25°C

Figure 11.

OP27ALARGE-SIGNAL


FREQUENCY

f − Frequency − Hz

VCC ± = ±15 VRL = 2 kΩTA = 25°C

CM

RR

− C

om

mo

n-M

od

e R

ejec

tio

n R

atio

− d

B

1 k

OP27ACOMMON-MODE REJECTION RATIO

vsFREQUENCY

140

10 k 100 k 1 M 10 M

f − Frenquency − Hz

40

VCC ± = ±15 VVIC = ± 10 VTA = 25°C

120

100

80

60

140

120

100

80

60

40

20

0

−200.1 1 10 100 1 k 10 k 1 M 100 M

− D

iffe

ren

tial

Vo

ltag

e A

mp

lific

atio

n −

dB

AV

D

OP27AOP27A

Figure 12 Figure 13





SUPPLY VOLTAGE REJECTION RATIOvs

FREQUENCY


− S

up

ply

Vo

ltag

e R

ejec

tio

n R

atio

− d

Bk

VCC ± = ±4 V to ±18 VTA = 25°C

SLEW RATEvs


TA − Free Air Temperature − °C

VCC ± = ±15 VRL ≥ 2 kΩ

SV

R

160

140

120

100

80

60

40

20

0

6

4

2

01 10 100 1 k 10 k 100 k 1 M 10 M 100 M − 50 − 25 0 25 50 75 100 125

SR

− S

lew

Rat

e −

V/μ

s

OP27(AVD ≥ 1)

PositiveSupply

NegativeSupply

Figure 14 Figure 15

OP27PHASE MARGIN AND

GAIN-BANDWIDTH PRODUCTvs

FREE-AIR TEMPERATUREG

ain

-Ban

dw

idth

Pro

du

ct −

MH

z


− 75 − 50 − 25 0 50 75 100 12525

VCC ± = ±15 V

GBW (f = 100 kHz)

75°

65°

55°

45°

35°

8.6

8.2

7.8

7.4

7

Φ −

Ph

ase

Mar

gin

φ m

ÁÁÁÁ

mφ

80°

70°

60°

50°

40°

85°

10.6

10.2

9.8

9.4

9

11

Figure 16.





V

EQUIVALENT INPUT NOISE VOLTAGEvs

BANDWIDTH

VCC ± = ±15 VRS = 20 ΩTA = 25°C

nV

/H

z

n −

Eq

uiv

alen

t In

pu

t N

ois

e Vo

ltag

e −

Tota

l Eq

uiv

alen

t In

pu

t N

ois

e Vo

ltag

e −

μV

10

1

0.1

0.010.1 1 10 100

Bandwidth − kHz(0.1 Hz to frequency indicated)

TOTAL EQUIVALENT INPUT NOISE VOLTAGEvs

SOURCE RESISTANCE

10 k1 k100

100

10

1

RS − Source Resistance − Ω

−

+

RS = R1 + R2

R1

R2

f = 1 kHzResistor Noise Only

f = 10 Hz

VCC ± = ±15 VBW = 1 HzTA = 25°C

Figure 17 Figure 18

nV

/H

z

OP27AEQUIVALENT INPUT NOISE VOLTAGE

vsTOTAL SUPPLY VOLTAGE

VCC + − VCC − − Total Supply Voltage − V

RS = 20 ΩBW = 1 HzTA = 25°C

f = 10 Hz

20

15

10

5

00 10 20 30 40

f = 1 kHz

− 50 − 25 0 25 50 75 100 125



vsFREE-AIR TEMPERATURE

VCC ± = ±15 VRS = 20 ΩBW = 1 Hz

5

4

3

2

1

Vn

− E

qu

ival

ent

Inp

ut

No

ise

Volt

age

−

nV

/H

zV

n −

Eq

uiv

alen

t In

pu

t N

ois

e Vo

ltag

e − f = 10 Hz

f = 1 kHz

Figure 19 Figure 20





nV

/H

zV

n −

Eq

uiv

alen

t In

pu

t N

ois

e Vo

ltag

e −


vsFREQUENCY

1 10 100 1000


10987

6

5

4

3

2

1

1/f Corner = 2.7 Hz

VCC ± = ±15 VRS = 20 ΩBW = 1 HzTA = 25°C

Figure 21

0 1 2 3 4 5

60

50

40

30

20

10

SHORT-CIRCUIT OUTPUT CURRENTvs

ELAPSED TIME

SUPPLY CURRENTvs

TOTAL SUPPLY VOLTAGE

VCC + − VCC − − Total Supply Voltage − V

TA = 125°C

5

4

3

2

15 15 25 35 45

I CC

− S

up

ply

Cu

rren

t −

mA

t − Time − minutes

I OS

− S

ho

rt-C

ircu

it O

utp

ut

Cu

rren

t −

mA

VCC ± = ± 15 VTA = 25°C

IOS +

TA = − 55°CÁÁÁÁÁÁ

OS

I

ÁÁÁÁÁÁ

CC

I

IOS −

TA = 25°C

Figure 22 Figure 23





V

OP27VOLTAGE FOLLOWER

SMALL-SIGNALPULSE RESPONSE

80

60

40

20

0

− 20

− 40

− 60

− 80

O −

Ou

tpu

t Vo

ltag

e −

mV

t − Time − μs0 0.5 1 1.5 2 2.5 3

VCC ± = ±15 VAV = 1CL = 15 pFTA = 25°C

VO

− O

utp

ut

Volt

age

− V

OP27VOLTAGE FOLLOWER

LARGE-SIGNALPULSE RESPONSE

8

6

4

0

− 2

− 4

− 6

− 8

2

t − Time − μs0 2 4 6 8 10 12

VCC ± = ± 15 VAV = − 1TA = 25°C

Figure 24 Figure 25

APPLICATION INFORMATION

general

The OP27 series devices can be inserted directly onto OP07, OP05, μA725, and SE5534 sockets with or withoutremoving external compensation or nulling components. In addition, the OP27 can be fitted to μA741 socketsby removing or modifying external nulling components.

noise testing

Figure 26 shows a test circuit for 0.1-Hz to 10-Hz peak-to-peak noise measurement of the OP27. The frequencyresponse of this noise tester indicates that the 0.1-Hz corner is defined by only one zero. Because the time limitacts as an additional zero to eliminate noise contributions from the frequency band below 0.1 Hz, the test timeto measure 0.1-Hz to 10-Hz noise should not exceed 10 seconds.

Measuring the typical 80-nV peak-to-peak noise performance of the OP27 requires the following special testprecautions:





noise testing (continued)

1. The device should be warmed up for at least five minutes. As the operational amplifier warms up, theoffset voltage typically changes 4 μV due to the chip temperature increasing from 10°C to 20°C startingfrom the moment the power supplies are turned on. In the 10-s measurement interval, thesetemperature-induced effects can easily exceed tens of nanovolts.

2. For similar reasons, the device should be well shielded from air currents to eliminate the possibility ofthermoelectric effects in excess of a few nanovolts, which would invalidate the measurements.

3. Sudden motion in the vicinity of the device should be avoided, as it produces a feedthrough effect thatincreases observed noise.

4.3 kΩ

110 kΩ2.2 μF

OscilloscopeRin = 1 MΩ

22 μF

100 kΩ

0.1 μF

LT1001

4.7 μF

2 kΩ

100 kΩ

10 Ω

0.1 μF

Voltage Gain = 50,000

+

−

OP27DeviceUnderTest

24.3 kΩ

0.01 0.1 1 10 100

AV

D −

Dif

fere

nti

al V

olt

age

Am

plif

icat

ion

− d

B

100

90

80

70

60

50

40

30


+−

NOTE: All capacitor values are for nonpolarized capacitors only.

Figure 26. 0.1-Hz to 10-Hz Peak-to-Peak Noise Test Circuit and Frequency Response





noise testing (continued)

When measuring noise on a large number of units, a noise-voltage density test is recommended. A 10-Hznoise-voltage density measurement correlates well with a 0.1-Hz to 10-Hz peak-to-peak noise reading sinceboth results are determined by the white noise and the location of the 1/f corner frequency.

Figure 27 shows a circuit measuring current noise and the formula for calculating current noise.

+

−

10kΩ

Vno

100 Ω 500 kΩ

500 kΩ[Vno

2 − (130 nV)2]1/2

1 MΩ × 100In =

Figure 27. Current Noise Test Circuit and Formula

offset voltage adjustment

The input offset voltage and temperature coefficient of the OP27 are permanently trimmed to a low level at wafertesting. However, if further adjustment of VIO is necessary, using a 10-kΩ nulling potentiometer as shown inFigure 28 does not degrade the temperature coefficient αVIO. Trimming to a value other than zero creates anαVIO of VIO/300 μV/°C. For example, if VIO is adjusted to 300 μV, the change in αVIO is 1 μV/°C.

The adjustment range with a 10-kΩ potentiometer is approximately ±2.5 mV. If a smaller adjustment range isneeded, the sensitivity and resolution of the nulling can be improved by using a smaller potentiometer inconjunction with fixed resistors. The example in Figure 29 has an approximate null range of ±200 μV.

+

−

−15 V

Output

2

37

8

4

1

Input 6

15 V10 kΩ

−15 V

Output

2

37

8

4

1

Input 6

4.7 kΩ

Figure 28. Standard Input OffsetVoltage Adjustment

Figure 29. Input Offset Voltage Adjustment WithImproved Sensitivity

15 V1 kΩ

4.7 kΩ

offset voltage and drift

Unless proper care is exercised, thermoelectric effects caused by temperature gradients across dissimilarmetals at the contacts to the input terminals can exceed the inherent temperature coefficient ∝VIO of theamplifier. Air currents should be minimized, package leads should be short, and the two input leads should beclose together and at the same temperature.





offset voltage and drift (continued)

The circuit shown in Figure 30 measures offset voltage. This circuit can also be used as the burn-in configurationfor the OP27 with the supply voltage increased to 20 V, R1 = R3 = 10 kΩ, R2 = 200 Ω, andAVD = 100.

15 V

+

−

−15 V

R150 kΩ

R2100 Ω

R350 kΩ

VO = 1000 VIO

2

36

7

4

NOTE A: Resistors must have low thermoelectric potential.

Figure 30. Test Circuit for Offset Voltage and Offset Voltage Temperature Coefficient

unity gain buffer applications

The resulting output waveform, when Rf ≤ 100 Ω and the input is driven with a fast large-signal pulse (>1 V),is shown in the pulsed-operation diagram in Figure 31.

+

−

Rf

Output

2.8 V/μs

OP27

Figure 31. Pulsed Operation

During the initial (fast-feedthrough-like) portion of the output waveform, the input protection diodes effectivelyshort the output to the input, and a current, limited only by the output short-circuit protection, is drawn by thesignal generator. When Rf ≥ 500 Ω, the output is capable of handling the current requirements (loadcurrent ≤20 mA at 10 V), the amplifier stays in its active mode, and a smooth transition occurs. WhenRf > 2 kΩ, a pole is created with Rf and the amplifier’s input capacitance, creating additional phase shift andreducing the phase margin. A small capacitor (20 pF to 50 pF) in parallel with Rf eliminates this problem.





unity gain buffer applications (continued)

To GateDrive

#1

+

−

TypicalMultiplexingFET Switches

#2

+

−

#24

+

−

Cold-JunctionCircuitry

+ −

−

+Output

0.05 μF100 kΩ

High-QualitySingle-Point Ground 10 Ω

AVD = 10,000

Type S Thermocouples5.4 μV/°C at 0°C

60

40

20

00 2 4 6

No

ise

Volt

age

− n

V 80

100

t − Time − seconds

120

8 10

OP27

NOTE A: If 24 channels are multiplexed per second and the output is required to settle to 0.1 % accuracy, the amplifier’s bandwidth cannot belimited to less than 30 Hz. The peak-to-peak noise contribution of the OP27 will still be only 0.11 μV, which is equivalent to an errorof only 0.02°C.

Figure 32. Low-Noise, Multiplexed Thermocouple Amplifier and 0.1-Hz to 10-Hz Peak-to-Peak Noise Voltage

PACKAGE OPTION ADDENDUM

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PACKAGING INFORMATION

Orderable Device Status(1)

Package Type PackageDrawing

Pins PackageQty

Eco Plan(2)

Lead/Ball Finish(6)

MSL Peak Temp(3)

Op Temp (°C) Device Marking(4/5)

Samples

JM38510/13506BPA ACTIVE CDIP JG 8 1 TBD A42 N / A for Pkg Type -55 to 125 JM38510/13506BPA

M38510/13506BPA ACTIVE CDIP JG 8 1 TBD A42 N / A for Pkg Type -55 to 125 JM38510/13506BPA

OP27AFKB ACTIVE LCCC FK 20 1 TBD POST-PLATE N / A for Pkg Type -55 to 125 OP27AFKB

OP27AJGB ACTIVE CDIP JG 8 1 TBD A42 N / A for Pkg Type -55 to 125 OP27AJGB

OP27CJGB ACTIVE CDIP JG 8 1 TBD A42 N / A for Pkg Type -55 to 125 OP27CJGB

(1) The marketing status values are defined as follows:ACTIVE: Product device recommended for new designs.LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.PREVIEW: Device has been announced but is not in production. Samples may or may not be available.OBSOLETE: TI has discontinued the production of the device.

(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availabilityinformation and additional product content details.TBD: The Pb-Free/Green conversion plan has not been defined.Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement thatlead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used betweenthe die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weightin homogeneous material)

(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuationof the previous line and the two combined represent the entire Device Marking for that device.

(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finishvalue exceeds the maximum column width.

http://www.ti.com/product/OP27?CMP=conv-poasamples#samplebuy





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Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on informationprovided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken andcontinues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

MECHANICAL DATA

MCER001A – JANUARY 1995 – REVISED JANUARY 1997

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

JG (R-GDIP-T8) CERAMIC DUAL-IN-LINE

0.310 (7,87)0.290 (7,37)

0.014 (0,36)0.008 (0,20)

Seating Plane

4040107/C 08/96

5

40.065 (1,65)0.045 (1,14)

8

1

0.020 (0,51) MIN

0.400 (10,16)0.355 (9,00)

0.015 (0,38)0.023 (0,58)

0.063 (1,60)0.015 (0,38)

0.200 (5,08) MAX

0.130 (3,30) MIN

0.245 (6,22)0.280 (7,11)

0.100 (2,54)

0°–15°

NOTES: A. All linear dimensions are in inches (millimeters).B. This drawing is subject to change without notice.C. This package can be hermetically sealed with a ceramic lid using glass frit.D. Index point is provided on cap for terminal identification.E. Falls within MIL STD 1835 GDIP1-T8

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