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High Temperature, Low Power

Operational Amplifier

Data Sheet AD8634

Rev. 0 Document FeedbackInformation furnished by Analog Devices is believed to be accurate and reliable. However, noresponsibility is assumed by Analog Devices for its use, nor for any infringements of patents or otherrights of third parties that may result from its use. Specifications subject to change without notice. Nolicense is granted by implication or otherwise under any patent or patent rights of Analog Devices.Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.ATel: 781.329.4700 2013Analog Devices, Inc. All rights reservedTechnical Support www.analog.com

FEATURES

Extreme high temperature operation40C to +210C, FLATPACK package

40C to +175C, SOIC packageRail-to-rail outputLow power: 1.3 mA maximum

Gain bandwidth product: 9.7 MHz typical at AV= 100Low offset voltage: 250 V maximum

Unity-gain stableHigh slew rate: 5.0 V/s typical at 210C

Low noise: 4.2 nV/Hz typical at 1 kHz and 210C

APPLICATIONS

Downhole drilling and instrumentation

AvionicsHeavy industrialHigh temperature environments

GENERAL DESCRIPTION

TheAD8634is a precision, 9.7 MHz bandwidth, dual amplifierthat features rail-to-rail outputs. TheAD8634is guaranteed tooperate from 3 V to 30 V (or from 1.5 V to 15 V) and at veryhigh temperatures.

TheAD8634is well suited for applications that require bothac and dc precision performance. The combination of widebandwidth, low noise, and precision makes theAD8634useful

in a wide variety of applications, including filters and interfacingwith a variety of sensors.

PIN CONFIGURATION

OUT A 1

IN A 2

+IN A 3

V 4

V+8

OUT B7

IN B6

+IN B5

AD8634TOP VIEW

(Not to Scale)11524-001

Figure 1. SOIC and FLATPACK Pinout

This dual-channel op amp is offered in an 8-lead SOIC packagewith an operating temperature range of 40C to +175C. It isalso available in an 8-lead ceramic flat package (FLATPACK)with an operating temperature range of 40C to +210C. Bothpackages are designed for robustness at extreme temperatures andare qualified for up to 1000 hours of operation at the maximumtemperature rating.

TheAD8634is a member of a growing series of high temperaturequalified products offered by Analog Devices, Inc. For a completeselection table of available high temperature products, see thehigh temperature product list and qualification data available atwww.analog.com/hightemp.

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AD8634 Data Sheet

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TABLE OF CONTENTSFeatures .............................................................................................. 1Applications ....................................................................................... 1General Description ......................................................................... 1Pin Configuration ............................................................................. 1Revision History ............................................................................... 2Specifications ..................................................................................... 3

Electrical Characteristics, VSY= 15.0 V................................... 3Electrical Characteristics, VSY= 3.0 V ....................................... 4

Absolute Maximum Ratings ............................................................5Predicted Lifetime vs. Operating Temperature .........................5Thermal Resistance .......................................................................5ESD Caution...................................................................................5

Typical Performance Characteristics ..............................................6Applications Information .............................................................. 10

Input Protection ......................................................................... 10Outline Dimensions ....................................................................... 11

Ordering Guide .......................................................................... 11REVISION HISTORY

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Data Sheet AD8634

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SPECIFICATIONSELECTRICAL CHARACTERISTICS, VSY= 15.0 V

VSY= 15.0 V, VCM= 0 V, TMIN TA TMAX, unless otherwise noted.

Table 1.

Parameter SymbolTest Conditions/Comments

SOIC Package40C TA +175C

FLATPACK Package40C TA +210C

UnitMin Typ Max Min Typ Max

INPUT CHARACTERISTICS

Offset Voltage VOS 250 250 V

Offset Voltage Drift VOS/T 0.35 0.35 V/C

Offset Voltage Matching TA= TMAX 150 150 VInput Bias Current IB 200 45 +200 200 40 +200 nA

Input Offset Current IOS 30 30 nA

Input Voltage Range VIN 14.7 +14.7 14.5 +14.5 V

Common-Mode RejectionRatio

CMRR VCM= 14.0 V to +14.0 V 105 120 100 115 dB

Large Signal Voltage Gain AVO 13.5 V VOUT +13.5 V,RL= 2 k 104 112 100 108 dB

Input Impedance

Differential 53||1.1 53||1.1 k||pFCommon-Mode 1.1||2.5 1.1||2.5 G||pF

OUTPUT CHARACTERISTICSOutput Voltage High VOH RL= 10 k to VCM 14.8 14.90 14.8 14.90 V

RL= 2 k to VCM 14.0 14.5 14.0 14.5 VRL= 2 k to VCM, TA= TMAX 14.60 14.75 14.60 14.75 V

Output Voltage Low VOL RL= 10 k to VCM 14.95 14.8 14.95 14.8 VRL= 2 k to VCM 14.8 14.70 14.75 14.65 V

RL= 2 k to VCM, TA= TMAX 14.70 14.65 VShort-Circuit Current ISC VOUT= 0 V, TA= TMAX +100/20 +105/18 mA

POWER SUPPLYPower Supply Rejection

RatioPSRR VSY= 2 V to 18 V 105 115 103 113 dB

Supply Current perAmplifier

ISY IOUT= 0 mA, TA= TMAX 1.0 1.2 1.1 1.3 mA

DYNAMIC PERFORMANCE

Slew Rate SR RL= 2 k 3.6 4.9 3.6 5.0 V/sGain Bandwidth Product GBP VIN= 5 mV p-p, RL= 10 k,

AV= 1009.7 9.7 MHz

Unity-Gain Crossover UGC VIN= 5 mV p-p, RL= 10 k,AV= 1

2.5 2.5 MHz

3 dB Closed-LoopBandwidth

3dB VIN= 5 mV p-p, AV= 1 4.9 4.9 MHz

Phase Margin M 84 82 DegreesNOISE PERFORMANCEVoltage Noise enp-p 0.1 Hz to 10 Hz 0.13 0.13 V p-p

Voltage Noise Density en f = 1 kHz 4.2 4.2 nV/HzCurrent Noise Density in 0.6 0.6 pA/Hz

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AD8634 Data Sheet

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ELECTRICAL CHARACTERISTICS, VSY= 3.0 V

VSY= 3.0 V, VCM= 1.5 V, VOUT= 1.5 V, TMIN TA TMAX, unless otherwise noted.

Table 2.

Parameter SymbolTest Conditions/Comments

SOIC Package40C TA +175C

FLATPACK Package40C TA +210C

UnitMin Typ Max Min Typ Max

INPUT CHARACTERISTICS

Offset Voltage VOS 250 250 VOffset Voltage Drift VOS/T 0.35 0.35 V/C

Offset Voltage Matching TA= TMAX 150 150 V

Input Bias Current IB 200 45 +200 200 40 +200 nA

Input Offset Current IOS 30 30 nAInput Voltage Range VIN 0.3 2.7 0.5 2.5 V

Common-Mode RejectionRatio

CMRR VCM= 0.3 V to 2.7 V 60 65 55 60 dB

Large Signal Voltage Gain AVO 0.5 V VOUT 2.5 V,RL= 2 k

104 112 100 108 dB

Input Impedance

Differential 53||1.1 53||1.1 k||pFCommon-Mode 2.8||2.5 2.8||2.5 G||pF

OUTPUT CHARACTERISTICSOutput Voltage High VOH RL= 10 k to VCM 2.8 2.90 2.8 2.90 V

RL= 2 k to VCM 2.0 2.5 2.0 2.5 V

RL= 2 k to VCM, TA= TMAX 2.60 2.75 2.60 2.75 V

Output Voltage Low VOL RL= 10 k to VCM 50 200 50 200 mVRL= 2 k to VCM 200 300 250 350 mV

RL= 2 k to VCM, TA= TMAX 300 350 mV

Short-Circuit Current ISC VOUT= 0 V, TA= TMAX +65/13 +70/11 mA

POWER SUPPLY

Power Supply Rejection

Ratio

PSRR VSY= 1.25 V to 1.75 V 97 102 95 100 dB

Supply Current perAmplifier

ISY IOUT= 0 mA, TA= TMAX 0.9 1.1 1.0 1.2 mA

DYNAMIC PERFORMANCE

Slew Rate SR RL= 2 k 3.5 4.9 3.5 5.0 V/sGain Bandwidth Product GBP VIN= 5 mV p-p, RL= 10 k,

AV= 1009.7 9.7 MHz

Unity-Gain Crossover UGC VIN= 5 mV p-p, RL= 10 k,AV= 1

2.5 2.5 MHz

3 dB Closed-LoopBandwidth

3dB VIN= 5 mV p-p, AV= 1 4.9 4.9 MHz

Phase Margin M 84 82 Degrees

NOISE PERFORMANCE

Voltage Noise enp-p 0.1 Hz to 10 Hz 0.13 0.13 V p-pVoltage Noise Density en f = 1 kHz 4.2 4.2 nV/HzCurrent Noise Density in 0.6 0.6 pA/Hz

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Data Sheet AD8634

Rev. 0 | Page 5 of 12

ABSOLUTE MAXIMUM RATINGSTable 3.

Parameter Rating

Supply Voltage 18 V

Input Voltage V VIN V+Differential Input Voltage1 0.6 V

Output Short-Circuit Duration to GND IndefiniteStorage Temperature Range 65C to +150C

Operating Temperature Range

SOIC Package 40C to +175C

FLATPACK Package 40C to +210CJunction Temperature

SOIC Package 200C

FLATPACK Package 245C

Lead Temperature (Soldering 60 sec) 300C

1For differential input voltages greater than 0.6 V, limit the input current toless than 5 mA to prevent degradation or destruction of the input devices

(see theInput Protection section).Stresses above those listed under Absolute Maximum Ratingsmay cause permanent damage to the device. This is a stressrating only; functional operation of the device at these or anyother conditions above those indicated in the operationalsection of this specification is not implied. Exposure to absolutemaximum rating conditions for extended periods may affectdevice reliability.

PREDICTED LIFETIME vs. OPERATINGTEMPERATURE

Comprehensive reliability testing is performed on all AnalogDevices high temperature products, including theAD8634.

Product lifetimes at extended operating temperature are obtainedusing high temperature operating life (HTOL). Lifetimes arepredicted from the Arrhenius equation, taking into accountassumptions about potential design and manufacturing failuremechanisms. HTOL is performed in accordance with JEDECJESD22-A108. A minimum of three wafer fab and assemblylots are processed through HTOL at the maximum operatingtemperature.

1

100k

10k

1k

100

10

120 210200190180170160150140130

PREDICTED

LIFETIME(Hours)

OPERATING TEMPERATURE (C) 11524-126

Figure 2. Predicted Lifetime vs. Operating Temperature

THERMAL RESISTANCE

JAis specified for the device soldered on a 4-layer JEDECstandard printed circuit board (PCB) with zero airflow.

Table 4. Thermal Resistance

Package Type JA JC Unit

8-Lead SOIC_N 121 43 C/W8-Lead FLATPACK 100 15 C/W

ESD CAUTION

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AD8634 Data Sheet

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TYPICAL PERFORMANCE CHARACTERISTICS

80

70

60

50

40

30

20

10

0100 80 60 40 20 0

VOS(V)

NUMBER

OFAMPLIFIER

S

20 40 60 80 100

11524-120

Figure 3. Offset Voltage Distribution, SOIC Package,

VSY= 15.0 V, TA= 175C

25

20

15

10

5

00 0.05 0.10 0.15 0.20 0.25 0.30

TCVOS(V/C)

NUMBER

OFAMPLIFIERS

0.35 0.40 0.45 0.50 0.55 0.60

11524-121

Figure 4. TCVOSDistribution, SOIC Package, VSY= 15.0 V

100

80

60

40

20

0

20

40

100 50 0 50 100 150 200 250

OFFSETVOLT

AGE

(V)

TEMPERATURE (C)

VSY= 15VVCM= 0V

11524-104

Figure 5. Typical Offset Voltage vs. Temperature

0

10

20

30

40

50

60

100

95

90

85

80

75

70

65

60

55

50

45

40

35

30

25

20

15

10

50

NUMBER

OFAMPLIFIERS

IB(nA) 11524-105

Figure 6. Input Bias Current Distribution, SOIC Package,

VSY= 15.0 V, TA= 175C

0

1

2

3

4

5

6

7

8

9

10

2.6

2.4

2.2

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2 0

0.20.40.60.81.01.21.41.61.82.02.22.42.6

NUMBER

OFAMPLIFIERS

IOS(nA) 11524-106

Figure 7. Input Offset Current Distribution, SOIC Package,VSY= 15.0 V, TA= 175C

100

90

80

70

60

50

40

30

20

10

0

100 50 0 50 100 150 200 250

INPUTBIASCUR

RENT(nA)

TEMPERATURE (C)

IB+

IB

11524-107

VSY= 15VVCM= 0V

Figure 8. Typical Input Bias Current vs. Temperature

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Data Sheet AD8634

Rev. 0 | Page 7 of 12

400

300

200

100

0

100

200

300

400

16 14 12 10 8 6 4 2 0 2 4 6 8 10 12 14 16

OFFSETVOLTAGE

(V)

COMMON-MODE VOLTAGE (V)

40C+25C+210C

11524-108

Figure 9. Offset Voltage vs. Common-Mode Voltage and Temperature,VSY= 15.0 V

1m

100

10

1

100m

10m

0.1 1 10 100

VOLVSS

(V)

ILOAD(mA)

40C+175C+210C

11524-109

Figure 10. Negative Dropout Voltage vs. Load Current and Temperature

0

20

40

60

80

100

120

100 1k 10k 100k 1M 10M

CMRR

(dB)

FREQUENCY (Hz)

VSY= 15V

TA= 210C

11524-110

Figure 11. CMRR vs. Frequency, TA= 210C

140

120

100

80

60

40

20

0

16 14 12 10 8 6 4 2 0 2 4 6 8 10 12 14 16

INPUTBIASCURRENT(nA)

COMMON-MODE VOLTAGE (V)

40C+25C+175C+210C

11524-111

Figure 12. Input Bias Current vs. Common-Mode Voltage and Temperature,VSY= 15.0 V

10m

100m

1

10

100

1 10 100 1000

VOH

VDD

(V)

ILOAD(mA)

40C+25C+210C

11524-112

Figure 13. Positive Dropout Voltage vs. Load Current and Temperature

20

0

20

40

60

80

100

120

100 1k 10k 100k 1M 10M 100M

PSRR

(dB)

FREQUENCY (Hz)

+PSRRPSRR

11524-018

VSY= 15V

TA= 210C

Figure 14. PSRR vs. Frequency

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AD8634 Data Sheet

Rev. 0 | Page 8 of 12

90

45

0

45

90

135

180

40

20

0

20

40

60

80

1k 10k 100k 1M 10M 100M

PHASEMARGIN

(Degrees)

11524-114

GAIN(dB)

FREQUENCY (Hz)

GAINPHASE MARGIN

VSY = 15VRL = 10k

Figure 15. Gain and Phase Margin vs. Frequency, TA= 210C

CH1 500mV CH2 500mV A CH1 0V

: 1.85V

@: 920mV

: 320ns

@: 140ns

CH1 AMPL2.93V

11524-021

INPUT

OUTPUT

Figure 16. Large Signal Positive Edge Response, VSY= 15.0 V,TA= 175C

CH1 500mV CH2 500mV A CH1 0V

: 1.69V

@: 750mV

: 320ns

@: 140ns

CH1 AMPL2.92V

11524-023

INPUT

OUTPUT

Figure 17. Large Signal Negative Edge Response, VSY= 15.0 V,TA= 175C

0

500

1000

1500

2000

2500

0 5 10 15 20 25 30 35

SUPPLYCURRENT(A)

SUPPLY VOLTAGE (V)

40C+25C+175C+210C

11524-117

Figure 18. Supply Current vs. Supply Voltage and Temperature

CH1 500mV CH2 500mV A CH1 0V

: 1.61V

@: 710mV

: 280ns

@: 140ns

CH1 AMPL2.91V

11524-020

INPUT

OUTPUT

Figure 19. Large Signal Positive Edge Response, VSY= 15.0 V,TA= 210C

CH1 500mV CH2 500mV A CH1 0V

: 1.67V

@: 830mV

: 280ns

@: 140ns

CH1 AMPL2.91V

11524-022

INPUT

OUTPUT

Figure 20. Large Signal Negative Edge Response, VSY= 15.0 V,TA= 210C

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Data Sheet AD8634

Rev. 0 | Page 9 of 12

1

10

100

1000

10 100 1k 10k

VOLTAGENOISE

DE

NSITY(nV/Hz)

FREQUENCY (Hz)

+25C+210C

11524-125

VSY = 15V

Figure 21. Voltage Noise Density vs. Frequency

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AD8634 Data Sheet

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APPLICATIONS INFORMATIONFigure 23 illustrates a typical application circuit that uses theAD8634and other Analog Devices high temperature products.

INPUT PROTECTION

As with any semiconductor device, if the input voltages appliedto theAD8634exceed either supply voltage, the input overvoltageI-to-V characteristic of the device must be considered. Whenan overvoltage condition occurs, the amplifier can be damaged,depending on the magnitude of the applied voltage and themagnitude of the fault current.

The protection diodes between the input and supply pins conductwhen the input common-mode voltage exceeds either supply pinby a diode drop. This diode drop varies with temperature and is inthe range of 0.3 V to 0.8 V. TheAD8634has no internal current-limiting resistors; therefore, fault currents can quickly rise todamaging levels.

This input current is not inherently damaging to the device,provided that it is limited to 5 mA or less. If a fault conditioncauses more than 5 mA to flow, an external series resistorshould be added at the expense of additional thermal noise.

Figure 22 illustrates a typical noninverting configuration foran overvoltage-protected amplifier where the series resistance,RS, is chosen such that

RS= (VIN (MAX) VSUPPLY)/5 mA

RS

R2

VIN

VOUT1/2

AD8634

11524-075

Figure 22. Resistance in Series with InputsLimits Overvoltage Currents to Safe Values

For example, a 1 k resistor protects theAD8634againstinput signals up to 5 V above and below the supplies. Notethat the thermal noise of a 1 k resistor at room temperatureis 4 nV/Hz, which is close to the voltage noise of the AD8634.

For configurations where both inputs are used, add a seriesresistor at each input to protect the inputs against damage. Toensure optimum dc and ac performance, it is recommendedthat source impedance levels be balanced.

11524-076

U2A

AD8634

U1

AD R225

VS

GND

OUTPUT

R12.5k

C110F

C20.1F C3

1FC40.1F

SIGNAL OUT

R22.5k

R32.5k

VCC

+5V

VCC

+5V

VCC

+5V

VEE

5V

VEE

5V

RTD

U3

AD8229

++

Figure 23. Typical High Temperature RTD Signal Conditioning Circuit

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Data Sheet AD8634

Rev. 0 | Page 11 of 12

OUTLINE DIMENSIONS

CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS

(IN PARENTHESES)ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR

REFERENCE ONLYAND ARE NOT APPROPRIATE FOR USE IN DESIGN.

COMPLIANT TO JEDEC STANDARDS MS-012-AA

012407-A

0.25 (0.0098)

0.17 (0.0067)

1.27 (0.0500)

0.40 (0.0157)

0.50 (0.0196)

0.25 (0.0099) 45

8

0

1.75 (0.0688)

1.35 (0.0532)

SEATINGPLANE

0.25 (0.0098)

0.10 (0.0040)

41

8 5

5.00(0.1968)

4.80(0.1890)

4.00 (0.1574)3.80 (0.1497)

1.27 (0.0500)BSC

6.20 (0.2441)5.80 (0.2284)

0.51 (0.0201)

0.31 (0.0122)

COPLANARITY

0.10

Figure 24. 8-Lead Standard Small Outline Package [SOIC_N]

Narrow Body(R-8)Dimensions shown in millimeters and (inches)

0.260

0.255 SQ

0.250

1.00

TOP VIEW BOTTOM VIEW

END VIEW

SIDE VIEW

0.012 RTYP

0.175

0.026 MIN

0.195

0.190 SQ

0.185

0.155

0.1500.145

0.053

0.050

0.047

0.006

0.005

0.004

0.091

0.083

0.075

0.019

0.017

0.015

1

4

8

5

IDEXMARK

0.054

0.044

0.034

0.05 TYP

0.024

0.007MIN

0.035TYP

Figure 25. 8-Lead Ceramic Flat Package [FLATPACK](F-8-2)

Dimensions shown in inches

ORDERING GUIDEModel1, 2 Temperature Range Package Description Package Option

AD8634HRZN 40C to +175C 8-Lead Standard Small Outline Package [SOIC_N] R-8

AD8634HFZ 40C to +210C 8-Lead Ceramic Flat Package [FLATPACK] F-8-2

1Z = RoHS Compliant Part.2The FLATPACK is prerelease only.

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AD8634 Data Sheet

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NOTES

2013 Analog Devices, Inc. All rights reserved. Trademarks andregistered trademarks are the property of their respective owners.

D11524-0-7/13(0)

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