The World Leader in High Performance Signal Processing Solutions

Process Control

New Product Update

DFAE TrainingBarcelona, June 2012

Paul Crook, I&I Segment Regional Marketing ManagerBernd Kraetzig, Field Application Engineer, Germany

Agenda Introduction – Collateral and Process Control market trends Industrial analogue inputs

SensorsSensor interfacingAnalog to digital conversionReview of a related CftL

Industrial analogue outputsDigital to analogue conversionHARTReview of a related CftL

Close

Agenda Introduction – Collateral and Process Control market trends Industrial analogue inputs

SensorsSensor interfacingAnalog to digital conversionReview of a related CftL

Industrial analogue outputsDigital to analogue conversionHARTReview of a related CftL

Close

Sales and design collateral related to Process ControlAll inclusive sales presentation.

Available in Content on Distribution Portal Sites of Interest

ADI Process Control Homepage http://processcontrol.analog.com/en/segment/pcia.html

Process Control Newsletter Subscription http://www.analog.com/en/content/adi_newsletters/fca.html

ADI Cross-reference and obsolete part search http://www.analog.com/dynamic/cross-reference/competitor_search.asp#

Online Webcasts Design Considerations for Industrial Instrumentation and Process Control Systems

http://www.analog.com/en/content/WC_DESIGN_INST_AND_PROCESS_CONTROL/webcast.html

Designing Programmable Logic Controller 4-20mA and Voltage I/O Modules http://www.analog.com/en/content/WC_PROG_LOGIC_CONTROLLER_4-20MA/webcast.html

Data Conversion Applications and Solutions for Precision Process Control

http://www.analog.com/en/digital-to-analog-converters/da-converters/products/webcasts/CU_semweb_Data_Conversion_Apps_and_Solutions/resources/fca.html System-level Analog Architectures for Process Control I/O Modules

http://seminar2.techonline.com/registration/wcIndex.cgi?sessionID=adi_jun2410

Sales and design collateral related to Process Control (cont.) Solutions Bulletins

Industrial ICs Solutions Bulletin, Volume 10, Issue 8 editionhttp://www.analog.com/v10Industrial

Industrial ICs Solutions Bulletin, Volume 11, Issue 4 editionhttp://www.analog.com/en/analog-to-digital-converters/ad-converters/products/sb_industrial_solutions_bulletin_vol11_issue4/fca.html

Videos ADM3052/3 Fully Isolated CAN Video

http://videos.analog.com/?fr_story=4a510810c72585c14ad6c08fa1fcddf8569dc2d4&rf=bm

AD5421 16-bit 4-20mA loop powered DAC http://videos.analog.com/?fr_story=01fb39a76711ebba75a106e775ee9c162400c9ee&rf=bm

Circuits from the Lab Homepage http://www.analog.com/en/circuits-from-the-lab/index.htm

Microsoft Office Excel Worksheet

6

PROCESS CONTROL LEVELS OF OPERATION

Process Control Sub-segments Focus ApplicationsProgrammable Logic Controllers (PLCs)

A digitally operating apparatus that controls, actuates and monitors complex machine variables.

Distributed Control Systems (DCS)Automation of a large facility or process often with multiple input

systems that are controlled by a central host and complete software solutions.

Field Instruments/Temperature ControllersDevices for sensing, transducing, monitoring, recording and

controlling physical variables e.g. flow, temperature, pressure etcSemiconductor Manufacturing

Equipment associated with the manufacture of semiconductors including implanters, beam probers, deposition systems, etching equipment, photolithography.

Analog Devices Confidential Information

8

DACBipolar/LVSS

V/IAmplifiers

ValvesVentsControlActuators+/-20mA

Analog Outputs

PLC/DCS Architecture

Systems can be partitioned as:Input ModuleOutput ModuleI/O Module

ADCSAR / SD

SignalCondition Amp + MUX

Analog InputsTempPressureMotorLevelVibration+/-20mA

isoPower Technology

PowerMgt

Transformer Isolation

Reference

Bus

µPBus ASIC

Digital IsolationiCoupler Technology

RS232

RS485/422/ 232

DSP Solutions

Reference

Sig

nal

Isol

atio

n

9

Field Instrument Example

SignalConditioning

uC

Dat

a Is

olat

ion

Analog Interface 0-10V

Power Supply ( Conditioning )P

ower

Isol

atio

n

Protocol(uC)

Digital Interface

PhysicalLayer

HART

4-20mA

RS485

Cable

Wireless

Loop Power

=Processor

LinearizationCalibrationDiagnostics

“SENSOR” “INTERFACE”

Sensor

Sensor

Sensor

10

Industrial I/O Challenge

Channel 4

Channel 3

Channel 2

Channel 1Channel 1

Analog O/P Analog I/P

Channel 1

Channel 2

Channel 3

Channel 4

Analog I/PAnalog O/P

Channel 1

Channel 2

Channel 3

Channel 4

Intelligent Integration Smaller form factor

More channels in same areaMore Robust

Intelligent Power MgmtSmaller housing = heat

Integrated power controlMore Robust

Channel 2

Channel 3

Channel 4

11

Communications – market trends Direct Analog Signal from Sensor

Temperature sensor interface directly on PLC / DCS module Temperature the most frequent quantity measured RTD (Resistive sensors) and TC (Thermocouple) sensors well standardized

Analog Communication 4-20mA

0-20mA 0-10V

0-5V, ±10V

Digital Communications HART Profibus Modbus Interbus DeviceNet Profinet EtherCat CAN bus Various physical (HW) layers

FSK (Frequency Shift Key) modulation RS485 Ethernet CAN

Wireless communication Emerging

Functional Safety

Increasing interest in equipment qualified for certain Safety Integrity Level (SIL)

Relevant standard IEC61508 - http://www.iec.ch/functionalsafety/explained/

This is a system level requirement which places constraints on electronic components in terms of:Diagnostic featuresRedundancyReliability

Certain of the newer industrial communications protocols such as EtherCAT, IO-Link, PROFIsafe include profiles to support functional safety

Agenda Introduction – Collateral and Process Control market trends Industrial analogue inputs

SensorsSensor interfacingAnalog to digital conversionReview of a related CftL

Industrial analogue outputsDigital to analogue conversionHARTReview of a related CftL

Close

14

Types of Analogue Input

Voltage 0 – 10V, ± 10V

Current (20mA) Industrial Standard 4 – 20mA loop 0 – 20mA loop

RTD Resistive Temperature Device Pt100, Ni1000, Cu10, etc

Thermocouple Two metals connected together Low differential voltage (mV) Second temperature sensor for Cold Junction

Compensation (CJC)

15

Sensor Interfacing

New amp and mux products aimed at industrial

applications

16

Amplifiers ?What is Important in Process Control ?

>30V CapabilityRobustness – Overvoltage ProtectionRail to Rail Inputs/OutputsIntegrated AMPS -> High Voltage Signal Conditioning and scaling.Common Mode Rejection over wide range..

17

ADA4084-x Next Generation OPx8436V, Low Noise, Low Power, Precision, RRIO Op Amp

Key Features Low Power: 650µA / amp Low Noise: 3.9nV/√Hz Low Offset: 100µV max Low Drift: 1 V/C Wide BW: 8.3 MHz Fast Slew Rate: 4.0 V/µs Low Input Bias Current: 80 nAApplications Battery-powered Instrumentation Power Supply Control and Protection DAC Output Buffer ADC Driver

ISY Noise VOS TcVos GBW & SR Ib Voltage Temp

750 µA max 3.9 nV/√Hz 100 µV max 1 V/C 8.3 MHz, 2.4 V/s min 450 nA max 3 V - 36 V -40°C - 125°C

ADA4084-1 Single Concept ADA4084-2 Dual Released ADA4084-4 Quad In Development Package: 3x3 LFCSP-8, SOT23-5 Package: MSOP-8, LFCSP-8

List Price: $2.85 @ 1k units Package: TSSOP-14, LFCSP-16 Samples Available: 3QCY11

ADI AdvantagesOffering power consumption that is ~1/3 that of its closest competition with competitive GBP, Vos, and Vn specs and Ib that is consistent over the full common mode range the ADA4084 provides a truly RRIO Op Amp over the full operating range

Low Noise Instrumentation Op Amp

18

Funnel Amplifiers

ADI introduces the industry's first fully differential attenuating precision amplifier. Our expert explains how AD8475 effectively drives low-voltage, high-precision differential input SAR ADCs in high-voltage applications. Learn more ...

19

AD8475 AD7982

REF

+5V

10kΩ

10kΩ

+IN 0.4x

-IN 0.4xVOCM

+5V

+IN

-IN

20Ω

20Ω 270pF

270pF1.35nF

0.5V – 4.5VVOUT(DIFF) ±4V

0.1µF

4V 2.5V

0.5V – 4.5VVOUT(DIFF) ±4V

4V 2.5V

SNR=97dBTHD=-113dB

ADR435

0V±10V

19

Interface ±10V or ±5V signal on a single-supply amplifier Integrate 4 Steps in 1

Attenuate Single-Ended-to-Differential Conversion Level-Shift Drive ADC

Drive differential 18-bit SAR ADC up to 4MSPS or the equavalent ∑-∆ ADC with few external components

AD8475 : Funnel Amplifier + ADC Driver

20

AD8475: Differential Funnel Amp & ADC DriverKEY FEATURES Active precision attenuation

(0.4x or 0.8x) Level-translating

VOCM pin sets output common mode Single-ended to differential conversion Differential rail-to-rail output Input range beyond the rail

KEY SPECIFICATIONS Bandwidth: 150 MHz Noise: 10 nV/√Hz RTO Slew rate: 50 V/μS Distortion: -112dB THD+N Gain drift: 3 ppm/°C max Output offset: 500 μV max Quiescent power supply: 3 mA

20

BENEFITS Connect industrial sensors to high

precision differential ADC’s Simplify design Enable quick development Reduce PCB size Reduce costAPPLICATIONS Process control modules Data acquisition systems Medical monitoring devices ADC driver

Low Voltage ADC Inputs

Large InputSignal

21

Over Voltage Protection (OVP)

Amplifiers

22

Why Over Voltage is needed ?

Power

AnalogInputs+/-10v

+24vPowerBlock

ADC

+15v -15v

Standard Input Module Connection

Power+24v

PowerBlock

ADC

Floating. Say its 0V

High Current Flow, DiodeSwitches on..

Mis-wired Module..

2323

OVP Solution

Internal ESD Protection Advantage

Cheap Solution Disadvantage

Not robust enough

External Diode Protection Advantage

Cheap Solution Disadvantage

Not suitable for some applications (i.e. Precision) Variable leakage current Variable capacitance Increase in non-linearity Need external circuitry

Differential Diode Protection Advantage

Cheap Solution Constant leakage current and capacitance

Disadvantage Need external circuitry

ADI OVP Solution Advantage

Integrated OVP solution Provides most , if not all protection needed Saves board area

Disadvantage Might need extra external protection

ADA4091

2424

ADA4096-x Improved OPX9636V, RRIO, Precision, µPower Op Amp with OVPKey Features Internal Input Over Voltage Protection

Up to ±32V beyond the Rails Characterized OVP Parametric Impact

(compared to external OVP solutions) Low Power: 60 µA High GBW: 450 kHz Low Offset Voltage: 35 µVApplications Battery Monitoring Sensor Conditioning Current shunt sense Process Control (PLC/DSC) Portable Power Supply Control and Instrumentation Wireless Base Stations

Isy GBW Vos Vos Drift Noise IB Voltage Temp Range

90 A max 450 kHz 300 V max 1 V/°C 27 nV/Hz 10 nA max 3 V - 36 V -40°C - 125°C

ADA4096-1 Single Concept ADA4096-2 Dual Released ADA4096-4 Quad In Development Package: SC70-5, LFCSP-8 (3x3) Package: MSOP-8, LFCSP-8 (3x3)

Samples Available: 4QCY’10 Package: TSSOP-14, LFCSP-14 (3x3) Samples Available: 4QCY’11

ADI AdvantagesWith 2X BW, ½ Vos and Vn, and ~1/10 Isy of the closest competition; the ADA4096 provides the industry’s highest level of over voltage protection for robust operation in demanding I&I applications

Gen 3 OVP

25

Switch/Mux Protection Products

26

Switches & Multiplexers

Dual SupplySingle Supply

ADG4xx, ADG5xx,ADG2x

ADG16xx

Industry standardLow On ResistanceLow Capacitance±15V Operation

Industry standardLow On ResistanceLow Capacitance+2.7 to +5.5 V ± 2.7 to ± 5.5 V

Industry Leading +5V to +12 V, ±5 V to ±15 V

Industry Leading Ultra Low On ResistanceSmall Packages+3.3 to +16 V± 3.3 to ± 8 V

Power off protection, Latch up proof, 8kV ESD Others

ADG14xx

ADG12xx

ADG6xx

NEWProtection Products

iCMOS ProcessIndustry leading

iCMOS ProcessIndustry leading

Low On ResistanceSmall packages

Low capacitanceLow charge injectionLow leakageSmall packages

Protection Products

Fault protectionChannel protectors

ADG54xx – Low On Resistance Latch up Proof Switches and Multiplexers

27

KEY FEATURES Robustness

Latch-up Proof 8kV HBM ESD

High Performance High Voltage: ±9V to ±22V or +9V - +40V Low Ron < 10Ω 0.1 nA leakage typ

Small packages 16-lead TSSOP, 4mm x 4mm LFCSP package

Other advantages 3 V logic Compatible Digital Inputs

VRANGE RON Leakage BW Package Temp

±15 V 9.8 W 0.1 nA 167MHz LFCSP, TSSOP -40°C – 125°C

ADG52xx – Low Charge Injection Latch up Proof Switches and MultiplexersKEY FEATURES Robustness

Latch-up Proof 2.5kV HBM ESD (4xSPST version)

High Performance High Voltage: Up to 22V dual supply & 40V

Single Supply Low Qinj: (0.07pC 4xSPST) – industry leading Low leakage: (400pA max @ 125°C 4xSPST)

- industry leading Small packages Other advantages

3 V logic Compatible Digital Inputs

VRANGE Qinj Leakage BW Package Temp

±15 V 0.07 pC @ 0V 400 pA max 435MHz LFCSP, TSSOP -40°C – 125°C

ADG5212/13 ADG5204/08/09 ADG5236/33/34• ADG5212 is 4x NO• ADG5213 is 2x NO, 2x NC*

• 4:1 Mux• 8:1 Mux / Diff 4:1 Mux

2 x SPDT 3 x SPDT / 4 x SPDT

ADG46xx – Low On Resistance Power Off Protection Switches

29

KEY FEATURES Robustness

Switch guaranteed Off with no power supplies present

Inputs are high impedance with no power

Pass negative signals with single supply voltage

±3.3V to ±8V dual supply operation +3.3V to +16V single supply operation

High Performance 6.1 Ω max @ 25°C Ultra-low flatness = 1.75 Ω

Small packages 16-lead TSSOP, 4mm x 4mm LFCSP

package

ADG4612/13• ADG4612 is 4x NO• ADG4613 is 2x NO, 2x NC*

Vrange±5V

Ron6.1 W

PackageLFCSP, TSSOP

Temp-40°C – 125°C

The World Leader in High Performance Signal Processing Solutions

CASE STUDY:Adjustable Gain Stage

(or input muxing)

Distortion and Errors caused by CMOS Switch

31

Reasons for „handmade“ PGA• Amplifier of PGA has not the appropriate

specifications• Gain stages of PGA do not fit application

• What is a PGA???

32

ADA4001-x – Low Noise, Audio Frequency AppsLow Noise, Low Input Bias Current, 10 MHz, JFET, RRO AmpKey Features Rail-to-Rail Output

Output swings to ≤0.2V of the rail Maximizes dynamic range

Low Noise: 7.2nV√Hz @ 1kHz 0.7µVpp from 0.1 to 10Hz

Low Isy: 1.85mA typ High CMRR and PSRR Low Power ConsumptionApplications Line Drivers and Receivers Professional Audio and Music Active Filters and PreOp Amps Integrators and Crossover Networks

ADA4001-2: Dual In Development ADA4001-4: Quad Concept Package: SOIC-8 Sample Availability: 2QCY’11

Package: SOIC-14

ADI AdvantagesWith RRO, ½ the power, 13dB better CMRR, 20% higher BW, 10% lower noise versus the closest competition the ADA4001 has leading specifications at a competitive price

Vn @ 1kHz VOS TCVos ISY CMRR/PSRR GBW Voltage Temp

7.2 nV/Hz 2mV max 1 V/C max 2mA max 113/106 dB 10 MHz 3 V - 36 V -40°C - 125°C

Product Vout Head-

room min

BW typ

Isy max

Vn@ 1 kHz

CMRR typ

THD + N typ

ADA4001-x 0.5V 10 MHz

2 mA

7.2 nV/Hz

113 dB 0.00005%

Closest Competitor

1.5V 8 MHz

5 mA

8 nV/Hz

100 dB 0.00008%

33

The way to the converter is sometimes ……more compicated than it looks like.

34

36

DC Weakness

Gain Error depending on signal Voltage

No switch in signal flow

G=-1 (can be calibrated)

Switch in signal flow

Vin=1V Vout =1,153VVin=10V Vout =11,413V

Error about 1%, not a good idea for 12-16bit System.

37

Rdson Flatness of ADG1211

38

Rdson Flatness of ADG1411

39

The example is extreme, but:

• be aware of RDSon Flatness

• use low RDSon Switches (they have also lower flatness)

• use higher value series resistors (be aware of noise, others)

• use PGA like AD825x series. Max. gain error for AD8250 is 0.04%

AD8253 Digital Programmable Gain Instrumentation Amplifier (PGIA)Key Features Digital Gain settings:

G = 1, 10, 100, 1000 Wide power supply range:

±5 V to ±15 V SuppliesSupply current: 4.5mA

Key Specs 80dBmin CMRR to 50 kHz ( G = 1) 17MHz –3 dB bandwidth (G =1) 20 V/µs slew rate Settling Time 0.5us to 0.01% 12 nV/√Hz, @ 1 kHz max. 10pmm/°C gain drift -40°C to +85°C

-IN

+IN

A1A2

REF

OUT

+

-

Gain Logic

A1

A2

A3

+VS

-VS

Price @ 1k Production

$4.95 Now

Package 10-L MSOP 3mm x 3mm

40

41

Analog to Digital conversionRefs, low power ADC

42

ADI Voltage Reference Portfolio

<5 ppm/oC

Temperature Coefficient

5-30 ppm/oC

>50 ppm/oC

ADR0xB

ADR46xx#

ADR44xB

ADR35xx#

ADR34xx#

ADR36xA

>30 ppm/oC

ADR51x *

ADR1581/2 *ADR504x *

ADR158x

* Shunt References

ADR58x

High Precision Low Noise Low Cost /Low Power

ADR43xB

ADR36xB

ADR29x ADR38x

ADR34xx35xx# ADR4xxA

# New

ADR45xx#ADR45xx/46xx#

43

ADR34xx: Precision, µPower, Voltage References KEY Features Max TC of 8ppm/ºC 100µA Max quiescent current Low initial output V error: 0.1% Max Long term drift: 30ppm/1khr typ. -40oC to +125oC Operation Small SOT23-6 package Input voltage: 2.3V to 5.5V Output current: Source 10mA

Sink 3mA Low output noise (0.1 Hz to 10 Hz):

< 18 μVpp (typical) at 2.5 Vout

Package Temp Price

SOT23-6 -40°C to +125°C $0.95 @ 1k

All Options of the ADR34xx Family P/N Vout RTS ADR3412 1.200 V Now ADR3420 2.048 V Now ADR3425 2.500 V Now ADR3430 3.000 V Now ADR3433 3.300 V Now ADR3440 4.096 V Now ADR3450 5.000 V Now

Improved Second Source for TI’s REF32xx family

44

ADR34xx CompetitionSpecification ADR34xx ADR36xB REF31xx REF32xx MAX6012 MAX6061 MAX6033B ISL21060C ISL60002C LT1790 LT6652B LM4132A LM4140C

Temperature Range-40oC to +125oC

-40oC to +125oC

-40oC to +125oC

-40oC to +125oC

-40oC to +85oC

-40oC to +85oC

-40oC to +125oC

-40oC to +125oC

-40oC to +85oC

-40oC to +125oC

-40oC to +125oC

-40oC to +125oC (j)

0oC to +70oC

Quiescent Current (μA) 100 190 135 135 35 125 60 40 0.9 80 560 100 230Supply Voltage Min (V) 2.3 3.6 1.8 1.8 2.5 2.5 2.7 5.5 2.7 2.6 2.7 Vref+ 0.4 Vref+ 0.4Supply Voltage Max (V) 5.5 15 5.5 5.5 12.6 12.6 12.6 2.7 5.5 18 13.2 5.5 5.5

Output Voltage (V)

1.2, 2.048, 2.5, 3.0,

3.3, 4.096, 5

2.048, 2.5, 3.0, 3.3, 4.096, 5

2.048, 2.5, 3.0, 3.3, 4.096, 5

2.048, 2.5, 3.0, 3.3, 4.096, 5

1.247, 2.048, 2.5, 3, 4.096,

4.5, 5

1.248,1.8, 2.048, 3,

4.096, 4.5, 52.5, 3,

4.096, 5

2.048, 2.5, 3.0, 3.3,

4.096

1.024,1.2,1.25,1.8,

2.048, 2.5, 3.3

1.25, 2.048, 2.5, 3, 3.3,

4.096, 5

1.25,2.048, 2.5, 3.0,

3.3, 4.096, 5

1.8, 2.048, 2.5, 3, 3.3,

4.096

1.024,1.25, 2.048, 2.5,

4.096Initial Output V Error 0.1 0.1 0.2 0.2 0.2 0.2 0.2 0.1 0.1 0.05 0.1 0.05 0.1Temperature Coefficient (ppm/oC) Max 8 9 20 (15 typ) 20 (4 typ) 15 20 10 10 20 10 10 10 10Drop Out Voltage (mV) 250 @ 2mA 300 50 (5 typ) 50 (5 typ) 100 200 500 NS NS 450 300 400 235Load Regulation (ppm/mA) Source 30 70 7-24 10-32 170 180 40 50 30 250 200 120 150Load Regulation (ppm/mA) Sink 50 NS 12-40 15-48 7 900 40 400 45 250 450 NA NA

Line Regulation (ppm/V) 50 30 65 65 64 72 15 150 61 220 80 100 200

Output Noise (0.1 Hz-10 Hz) μV p-p Typ 2.5V 18 8.25 33 33 50 27 16 10 30 80 5 170 5Wideband Noise (10 Hz-10kHz) μVRMS Typ 40 24 24 65 15 12 NS NS 118 7.5 NS NSOutput Current Source (mA) 10 min 5 min 10 10 0.5 5 15 10 20 5 5 20 8Output Current Sink (mA) -3 min -1 min 10 10 0.5 2 0.1 5 20 3 5 NA NAOutput Voltage Hysteresis 70 100 100 100 130 130 150 100 100 100 105 75 20Long Term Stability @1k Hrs ppm 30 50 70 55 50 62 40 100 50 50 60 50 60Packages SOT23-6 SOT23-5 SOT23-3 SOT23-6 SOT23-3 SOT23-3 SOT23-6 SOT23-3 SOT23-3 SOT23-6 MSOP8 SOT23-5 SO-8Pricing @ 1k Units 0.95$ 1.20$ 0.99$ 1.70$ 1.35$ 1.35$ 2.40$ 2.28$ 1.45$ 2.91$ 1.65$ 2.30$ 1.91$

LTC NSCADI TI MAXIM Intersil

45

Field Instrument – Example Pressure Transmitter

S-DADC

MU

XDifferential Pressure(Main Value Measured)

Static Pressure(Compensation)

Temperature(Compensation)

S-DADC

uC

CALIBRATIONLINEARIZATIONCOMPENZATION

In-AMP(PGA)

ADC(24-bit)

In-AMP(PGA)

ADC(24-bit)

uC

COMMUNICATION

HARTMODEM

DAC(16-bit)

4-20mADriver

DAC

LINEARREGULATORand/orSWITCH MODE REGULATOR

LINEARREGULATORS

12V..50V4-20mA

POWER MANAGEMENT

VREF

uC

DISPLAYLCDWATCHDOGSDIAGNOSTICS

46

AD7792/93/94/98/99 Family Overview

AD7798/99 AD7792/93 AD7794/AD7795 16-/24-bit S-D ADC 300 μA / 440 μA 3 Differential Channels Reference Detect Bridge Sensor Power-Off

Switch Burnout Currents 16-TSSOP Package

16-/24-bit S-D ADC 450 μA 3 Differential Channels Voltage Reference Programmable Current

Sources Burnout Currents 16-TSSOP Package

24/16-bit S-D ADC 450 μA 6 Differential Channels Voltage Reference Programmable Current

Sources Burnout Currents 24-TSSOP Package

KEY FEATURES Low Power (300 μA to 450 μA) Internal Programmable Gain Amplifier Chopping – superior offset & drift specs Internal Clock & Buffer Simultaneous 50 & 60 Hz Rejection 4sps to 500sps Output Data Rate Supply: 2.7V to 5.25V Temperature: -40°C to +105°C

The World Leader in High Performance Signal Processing Solutions

CASE STUDY:Errors in Temperature

Measurement

48

RTD Input from PLC Demo System

49

Self Heating:

Example:PT10001 mA Current SourceSelf heating coeficient: S= 0.3K/mW

Þ ΔT = 0.3K/mW x 1kOhm x (1mA)2 = 0.3K

Þ Use lower current (but: means lower voltage to measure)

50

Wire Resistance:

Example:PT10010m sensor cable, 0.1mm2 (means 20m of wire)Þ 3.56 OhmÞ Measured resistance: 103.56 Ohms:

Þ Approx 9°C

Þ Use 4-wire solution or other cable

51

Analog Input Leakage:

Example:PT100210 μA Current Source250 pA (AD7793 Datasheet)RC Input filter used in PLC Demo: 2x1K

Þ Voltage drop across filter: 0.25 mV Þ Voltage at PT100 for 0°C 21 mVÞ Voltage of 21.25 mV means 3°C.

Þ But leakage current is more symmetric for both inputs

52

Input Protection:

TVS Diode:1 μA leakage current

Example: PT100, 210 μA excitation current, 5.1kOhm Ref. resistor:

21 mV measured voltage across RTD2.142 V ref. Voltage vs. 2.121 V with two diodes.

Þ 21.2 mV is seenÞ 100.95 OhmÞ 2°C

53

When an ADC seems to be out of spec or does not reach the guaranteed performance be aware of the front end!

Wherever there is a possible leakage path – a current will flow

Wherever drift occurs – it will drift in the wrong direction

54

Precision, Low Power, Single-Supply, Fully Integrated Differential ADC Driver for Industrial-Level Signals (CN0180)

Adobe Acrobat Document

funnel amplifier to perform attenuation, level shifting, and conversion to differential without the need for any external components.

Total power (ADC+amp)=22mW from single 5V supply

AAF common mode BW 29.5 MHz (20 Ω, 270 pF), and the differential BW 3.1 MHz (40 Ω, 1.3 nF)

Agenda Introduction – Collateral and Process Control market trends Industrial analogue inputs

SensorsSensor interfacingAnalog to digital conversionReview of a related CftL

Industrial analogue outputsDigital to analogue conversionHARTReview of a related CftL

Close

57 www.analog.com

AD5750 – Precision Analog Voltage/Current Output Driver Software Programmable PLC V/I Outputs

Suitable for use with Low-voltage nanoDAC™

Small footprint IOUT Range:

4-20mA, 0-20mA, 0-24mA, ±20mA, ±24mA

0.03% Accuracy (TUE) 2ppm/oC Full Scale Output Drift

VOUT Range: 0 - 5V, 0 - 10V, ±5V, ±10V 20% Over-range. ±0.05% Accuracy (TUE)

Functionality Diagnostics/Fault detection Digital input redundancy checker External 4.096V Reference

Companion Product Temp range Interface Power Supply Package

AD566x nanoDAC™ Family -40oC to +105oC Serial ±12V to ±24V 30 – LFCSP

5mm * 5mm

Related ProductsAD5750-1 AD5751 AD5748

Similar Functionality

External 2.5V Ref.

Similar Functionality

55V compliant

Reduced Ranges 24V compliant

58

AD5422 Current Source & Voltage Out DAC– 16 Bit, 4-20mA , ±10V

Single Channel Configuration for Isolated PLC Systems 16-Bit Resolution

IOUT 4mA-20mA, 0mA-20mA or 0mA-24mA ±0.01% FSR TUE 4ppm/oC Output Drift

VOUT 0-5V, 0-10V, ±5V, ±10V 10% over-range 0.01% FSR TUE 3ppm/oC Output Drift Force & Sense capability

Functionality Internal 5V 10ppm/oC Reference Diagnostics/Fault detection Output Loop compliant AVDD-2.5V Output Slew Rate Control

Resolution Features Temp Range Interface Power Supply Package

16-Bit Fault Detection

-40oC to +85oC Serial 12V to 48V or

±12V to ±24V 24 – TSSOP40 - LFCSP

Related ProductsAD5412

12 Bit Version Similar Functionality

The World Leader in High Performance Signal Processing Solutions

CASE STUDY:AD5422 THERMAL

ANALYSIS

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Case Study – Designing the AD5422 Thermal Considerations

Understanding Power Dissipation on output modulesCalculate Maximum allowed ambient TemperatureDynamic Power Control

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Calculating Maximum Supply needed

AD5422

1k

26V In a typical current output

configuration, the maximum current output can be 24mA.

In this case, the output supply voltage needs to be high enough to provide enough compliance voltage on the output plus some headroom (~2v)

Therefore, when driving a 1K load the AVDD voltage supply would need to be at least 26v. VSUPPLY = (24mA x 1K ohm) + 2v

= 26V

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Zero Ohm Load is a valid Condition !

AD5422

0 ohm

26V A zero ohm load is a valid condition in normal operation.

In this case, when driving a 24 mA output, all the power generated will get dissipated on the AD5422.

A calculation shows that in this case up to .6W would be dissipated on chip…

Is this a problem considering it’s a valid condition ?

Power Dissipation = (26v x 24ma) = .624W

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Exposed Paddle Operates as a Heat Sink The AD5422 is manufactured

in a LFCSP package.

This package has a copper plane connected to the AVSS supply

Ensuring that this paddle is connected to a AVSS plane will increase the AD5422’s thermal rating

Thermal Impedance can be found in the D/S. It shows how much die temperature increases per ºC per Watt of on chip power.

Thermal Impedance = 28ºC/W

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Calculating Effects of Power Dissipation We previously calculated for a 24 mA

output driving into a zero ohm load the on chip power dissipation would be ~0.6W.

Referring to the datasheet we also found the thermal impedance is 28ºC/W. This is listed in the max ratings spec.

We can now calculate the die temperature increase due to the 24mA driving a zero ohm load.

We also need to calculate on chip dissipation due to AVDD, AVSS supply contribution.

We now sum these together to calculate total on chip die increase.

Power Dissipation from 24ma output driving a zero ohm load = 0.6W

Thermal Impedance=28ºC/W

Die temperature increase from 24ma output = 28 x 0.6 = 16.8 ºC

Power Dissipation for AVDD/AVSS(from Datasheet) = 128mW

Die temperature increase due to AVDD/AVSS contributions = 28 x .128= 3.5

Total Die Increase 16.8 + 3.5 = 20.3ºC

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Calculating the Maximum Ambient TempThe maximum allowable on

chip die temperature for the AD5422 is 125ºC. (Again, we get this from the max ratings on the datasheet..)

We previously calculated die temp under worst case operating conditions to be 20.3ºC.

Max Junction Temp = 125ºC

Max Die Temp Increase whcnDriving 24 mA into zero ohm Load = 20.3ºC

Max Ambient Temperature= 125-20.3 = 104.7ºC

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At higher supply Voltages, the ambient drops.. !

In some cases, higher supply voltages may be needed in the system.

In this case, 45v is shown as an example.

This is a concern as this could cause device self heating problems

In such cases, is there any way to remove some power dissipation off chip..?

AD5422

45V

Power Dissipation = (45v x 24mA) = 1.08W

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Dynamic Power Control Enables Deployment of Channel Rich, High-Performance Designs

Driving a 0Ω Load (i.e. Short) is a valid condition

Using Fixed 30V SupplyRload = 0Ω, Iout = 24 mA

Power = 30 * 0.024 = 0.72W For 4-Channel System

Power = 4 * 0.72W = 2.88 W !

67

I

30V

0-24 mA

0 Ω load

Incumbent Solution

68

Using DPC ArchitectureRload = 0Ω, Iout = 24mA

Power = 7 * 0.024 = 0.168WFor 4-channel System

Power = 4 * 0.168W = 0.672W !

>4X ReductionIn Power & Energy Usage

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I

5V

24 mA

0 Ω load

DC-DCVoltage & Power is Dynamically Adjusted

Dynamic Power Control Enables Deployment of Channel Rich, High-Performance Designs

DPC works by continually sensing the load, delivering only the required power while minimizing power loss in the rest of the system

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AD5755 16-Bit 4-Channel Control DACNew Benchmark in System Performance and Power OptimizationFeatures:16-Bit ResolutionDynamic Power Control

Enables Thermal Management 4X Improvement In Power Efficiency

Voltage or Current Output on the Same Pin IOUT Range: 0mA-20mA, 4mA–20mA or 0mA–24mA

±0.05% TUE AccuracyVOUT Range: 0-5V, 0-10V, ±5V, ±10V,±6V,±12V

±0.05% TUE AccuracyUser programmable Offset and GainOn Chip DiagnosticsOn-Chip Reference (5 ppm/°C Max)−40°C to +105°C Temperature RangeHART Connectivity – Special Dedicated HART PINS

69

9mm

9mm

70

S-DADC

MU

XDifferential Pressure(Main Value Measured)

Static Pressure(Compensation)

Temperature(Compensation)

S-DADC

uC

CALIBRATIONLINEARIZATIONCOMPENZATION

In-AMP(PGA)

ADC(24-bit)

In-AMP(PGA)

ADC(24-bit)

uC

COMMUNICATION

HARTMODEM

DAC(16-bit)

4-20mADriver

DAC

LINEARREGULATORand/orSWITCH MODE REGULATOR

LINEARREGULATORS

12V..50V4-20mA

POWER MANAGEMENT

VREF

uC

DISPLAYLCDWATCHDOGSDIAGNOSTICS

Field Instruments – Analog Communication

71

AD5421 – Loop Powered 4mA-20mA DAC

Complete solution for Loop Powered Smart Transmitters

Current Output 16 bit Resolution 4 to 20mA (3.8 to 21mA, 3.2 to 24mA options) ±0.05% max FSR Total Accuracy ±3ppm/oC Output Drift

On-chip Voltage Regulator Adjustable 1.8V to 12V output

Features 250 µA quiescent current consumption On-chip 2.5V 4ppm/ oC Voltage Reference Die Temperature Monitoring Fault Detection – Alarms NAMUR 43 Compliant HART Compatible

Resolution Features Temp range Interface Power Supply Package

16-Bit System Solution -40oC to +105oC Serial From Loop

5.5V to 52V28 – TSSOP32 – LFCSP (5mm * 5mm)

Adobe Acrobat Document

The World Leader in High Performance Signal Processing Solutions

AD5700 & AD5700-1

Industry’s Lowest Power, Smallest Size Complete HART Modem Registered with the

HART Communication Foundation.

HART Modem

What Is HART?Highway Addressable Remote Transducer

1.2kHz2.2kHz

PLC/DCSInput/Output Cards Field Instruments

Global Communication

Standard

HART DIGITAL DATA

ANALOG 4mA TO 20mA INTELLIGENT

HART DEVICE

HART-ENABLED I/O

I/O TO DEVICE

EnhancesMeasurement

Capability

EnablesDiagnostics

74

AD5700 HART Modem – Key Benefits Lowest power HART modem on the Market

50% lower power than competing solutionsIdeal for Smart Transmitters enabling optimisation of the power budget

and subsequent enhancement of the feature set. Smallest Footprint

Supporting industry trend towards smaller form factors with enhanced functionality

Wide Temperature rangeSpecified performance up to 125oC

On-chip, low power, ±1% oscillatorAD5700 does not require external crystal or

clock sourcePCB area saving

Drive capability of HART_OUTNo need for external buffering

Robust demodulation in the presence of in band and out of band interferers giving a lower BER.

Complete & application tailored feature set Simplifying design and reducing overall BOM cost

HART Modem Competitive ComparisonADI DS8500 A5191HRT HT2012

Power 120 – 140 µA 285µA 450µA – 3.3V600µA – 5.0V

500µA

PKG Size 4mm x 4mm 5mm x 5mm 9mm x 9mm 19mm x 6mm

Supply Range

2V to 5.5V 2.7V to 3.6V 3.3V to 5V 3.0V to 5.5V

TempRange

-40°C to +125°C

-40°C to +85°C

-40°C to +85°C -40°C to +85°C

Features Minimal external componentsIntegrated

•Rx Filter•Oscillator

External components required

•Filter•Oscillator

Many external components required

•Wave-shaping

• Filter•Oscillator

Many external components required

Analog Devices confidential

AD5700 Demo: Compliance Registered with the HART Communication FoundationFully Compliant, Low Risk Design

Demo—AD5700D1Z

AD5700/AD5700-1 Integrated HART FSK Modem

Design ResourcesDatasheet, Evaluation BoardCFTL’sApplications Support

DAC.info@analog.com

ReleasedSamples Available Nowwww.analog.com/AD5700

Production QuantitiesAvailable Now

Hart Certification testing –AD5700 passed & now registeredhttp://www.hartcommproduct.com/i

nventory2/index.php?action=memberdirectory&num=325

AD

AD5700HART

78

Loop powered 4-20mA + HART interface with AD5421+AD5700(CNxxx)

AD5700 can use anexternal crystal or ceramic resonator, a CMOS input, or aninternal oscillator

In safety critical applications the AD5700 must be isolated fromthe high voltage of the loop supply

A complete industrial 4-20mA + HART interface solution for loop powered applications – industrial field instruments / loop powered transmitters / smart transmitters

AD5421 includes a regulated voltage output that is used to power itself and other devices in the transmitter. This regulator provides a regulated 1.8 V to 12 V output voltage.

The AD5421 also contains 1.22 V and 2.5 V references,

The high speed serial interface is capable of operating at 30 MHz

The ratio of C_SLEW:C_HART sets the amplitude of the HART signal.C-code is supplied with the Circuit Note to digitally control the slew rate so it does not interfere with the HART signaling

Loop Powered Smart Transmitter DemoAD5700 HART Modem

“High Impedance”Transmitter/Sensor

Slave Devices “Low Impedance”Master Device

24V Loop Power Supply

Secondary Device

HART DIGITAL DATA

AD5700HART

ANALOG 4mA TO 20mA

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