AD8231:  Zero Drift, Digitally Programmable Instrumentation Amplifier

The AD8231 is a low drift, rail-to-rail, instrumentation amplifier with software-programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128. The gains are programmed via digital logic or pin strapping. ...More

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AD8231:  Zero Drift, Digitally Programmable Instrumentation Amplifier

Product Description

The AD8231 is a low drift, rail-to-rail, instrumentation amplifier with software-programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128. The gains are programmed via digital logic or pin strapping.

The AD8231 is ideal for applications that require precision performance over a wide temperature range, such as industrial temperature sensing and data logging. Because the gain setting resistors are internal, maximum gain drift is only 10 ppm/°C for gains of 1 to 32. Because of the auto-zero input stage, maximum input offset is 15 μV and maximum input offset drift is just 50 nV/°C. CMRR is 80 dB for G = 1, increasing to 110 dB at higher gains.

The AD8231 also includes an uncommitted op amp that can be used for additional gain, differential signal driving, or filtering. Like the in-amp, the op amp has an auto-zero architecture, rail-to-rail input, and rail-to-rail output.

The AD8231 includes a shutdown feature that reduces current to a maximum of 1 μA. In shutdown, both amplifiers also have a high output impedance, which allows easy multiplexing of multiple amplifiers without additional switches.

The AD8231 is specified over the extended industrial tempera-ture range of −40°C to +125°C. It is available in a 4 mm × 4 mm 16-lead LFCSP.

Applications

  • Pressure and strain transducers
  • Thermocouples and RTDs
  • Programmable instrumentation
  • Industrial controls
  • Weigh scales

    • Data Sheet, Rev. A, 9/07

    Features

    • Digitally/pin-programmable gain
      G = 1, 2, 4, 8, 16, 32, 64, or 128
    • Specified from −40°C to +125°C
      50 nV/°C maximum input offset drift
      10 ppm/°C maximum gain drift
    • Excellent dc performance
      80 dB minimum CMR, G = 1
      15 μV maximum input offset voltage
      500 pA maximum bias current
      0.7 μV p-p noise (0.1 Hz to 10 Hz)
    • Good ac performance
      2.7 MHz bandwidth, G = 1
      1.1 V/μs slew rate
    • Rail-to-rail output
    • Shutdown/multiplex
    • Extra op amp
    • Single-supply range: 3 V to 6 V
    • Dual-supply range: ±1.5 V to ±3 V

    Diagrams

    AD8231 Diagram
    Functional Block Diagram for AD8231

    Specifications

    Single/Dual Supply Single
    Voltage Supply (Vmax) +6V
    Gain Setting Method Pin,Software
    Gain Range (min to max) 128
    Bandwidth G=10 (kHz typ) 700kHz
    CMRR (dB) 100dB
    Vnoise RTI 1-10 Hz µVp-p 0.7µV p-p
    Temperature Range -40 to +125
    Supply Current 4mA

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    Part# Description Single/Dual Supply Vcc-Vee Gain Setting Method Bandwidth G=10 (kHz typ) Gain min. Gain max. Min CMRR @ 60 Hz Min Gain Min CMRR @ 60Hz Max Gain Vnoise RTI 1-10 Hz µVp-p Price* (1000-4999)
    AD522 Diff Amp Dual 10V to 36V Resistor 3 1 1,000 75dB 100dB 4 -
    AD524 Precision IA Dual 12V to 36V Pin 400 1 1,000 70dB 110dB 0.3 $9.52
    AD526 Software Programmable Dual 9V to 33V Software 350 1 16 - - 3 $6.39
    AD620 General Purpose IA Dual 4.6V to 36V Resistor 800 1 10,000 73dB 110dB 0.28 $3.18
    AD621 Precision IA Dual 4.6V to 18V Pin 800 10 100 93dB 110dB 0.28 $4.09
    AD622 Low Cost IA Dual 5.2V to 36V Resistor 800 1 1,000 66dB 103dB 0.3 $2.51
    AD623 S.S R-R IA Single/Dual 2.7V to 12V Resistor 100 1 1,000 70dB 105dB 2 $1.40
    AD624 Precision IA Dual 12V to 36V Pin 400 1 1,000 70dB 110dB 0.3 $11.93
    AD625 Programmable Gain IA Dual 12V to 36V Resistor 400 1 10,000 70dB 110dB 0.3 $8.78
    AD626 Diff Amp Single/Dual 4.8V to 12V Pin 100 10 100 55dB 55dB 2 $3.70
    AD627 Micropower IA Single/Dual 2.2V to 36V Resistor 30 5 1,000 77dB 77dB 1.2 $2.56
    AD628 High CMV DA Single/Dual 4.5V to 36V Pin, Resistor 600 0.1 100 75dB 75dB 15 $1.78
    AD629 High CMV DA Dual 5V to 36V fixed 500 - - 77dB 77dB 15 $2.84
    AD8129 Low Cost Diff Amp Single/Dual 4.5V to 25V Resistor 200000 10 - 94dB - - $1.57
    AD8202 High CMV DA Single 3.5V to 12V fixed 50 - - 82dB 82dB 10 $1.34
    AD8203 High CMV DA Single 3.5V to 12V fixed 60 - - 82dB 82dB 10 $1.37
    AD8205 S.S Diff Amp Single 4.5V to 5.5V fixed 50 - - 78dB 78dB 20 $1.51
    AD8206 S.S Diff Amp Single 4.5V to 5.5V fixed 100 - - 76dB 76dB 20 $1.37
    AD8210 Bi-Directional Shunt Mon Single 4.5V to 5.5V fixed 500 20 20 100dB 100dB 7 $1.81
    AD8211 High CMV Shunt Mon Single 4.5V to 5.5V fixed 500 20 20 100dB 100dB 7 $0.81
    AD8212 High CMV Shunt Mon Single 7V to 65V Resistor 1000 1 1,000 100dB 100dB 1.1 $0.93
    AD8213 Dual High CMV Shunt Mon Single 4.5V to 5.5V fixed 500 20 20 100dB 100dB 7 $2.01
    AD8214 High CMV Threshold Detec Single 5V to 65V Resistor - 1 100 80dB 80dB 2.2 $0.76
    AD8215 High CMV Shunt Mon Single 4.5V to 5.5V fixed 450 20 20 100dB 100dB 7 $1.21
    AD8216 High BW 65 V Diff Amp Single 4.5V to 5.5V fixed 3000 3 3 80dB 80dB 20 $1.62
    AD8220 R-R JFET IA Single/Dual 4.6V to 36V Resistor 800 1 1,000 78dB 94dB 0.8 $2.32
    AD8221 High Performance IA Dual 4.6V to 36V Resistor 562 1 1,000 80dB 130dB 0.25 $2.01
    AD8222 Dual High Performance IA Dual - to - Resistor 750 1 10,000 80dB 130dB 0.25 $3.63
    AD8223 S.S R-R IA Single/Dual 3V to 25V Pin 200 5 1,000 70dB 105dB 2 $1.05
    AD8224 Dual JFET R-R IA Single/Dual 4.6V to 36V Resistor 800 1 1,000 78dB 94dB 0.8 $4.17
    AD8225 Fixed G=5 IA Dual 3.4V to 36V fixed 900 - - 86dB 86dB 1.5 $3.29
    AD8226 Wide Supply R-R out IA Single/Dual 2.2V to 36V Resistor 160 1 1,000 80dB 105dB 2 $1.40
    AD8228 Precision IA Dual 4.6V to 36V Pin 650 10 100 100dB 120dB 0.5 $3.03
    AD8230 Zero Drift IA Single/Dual 8V to 16V Resistor 2 2 1,000 - 110dB 3 $2.99
    AD8231 Zero Drift Software Prog Single 3V to 6V Pin, Software 700 1 128 80dB 110dB 0.7 $1.71
    AD8236 - Single 1.8V to 5.5V Resistor 9 - - 94dB 110dB 4 $0.99
    AD8250 Software Programmable Dual 10V to 34V Pin, Software 3000 1 10 80dB 98dB 1 $5.01
    AD8251 Software Programmable Dual 10V to 34V Pin, Software 2500 1 8 80dB 98dB 1.2 $5.01
    AD8253 Software Programmable Dual 10V to 34V Pin, Software 10000 1 1,000 80dB 120dB 1 $4.95
    AD8270 Dual Diff Amp Dual 5V to 36V Pin 10000 0.5 2 70dB 80dB 1 $1.91
    AD8271 - - 5V to 36V - - - - - - - $1.25
    AD8273 Dual Audio Diff Amp Dual 5V to 36V Pin 20000 0.5 2 77dB - 2 $1.67
    AD8274 Precision Diff Amp Dual 5V to 36V - 10000 0.5 2 - - - $1.05
    AD8275 Level Shifting ACD Driver Single 3.3V to 15V Resistor - - - 96dB 96dB - $1.60
    AD8276 - Single/Dual 4V to 36V fixed - - - 86dB - - $1.00
    AD8290 Sensor Amp - 2.6V to 5.5V fixed - 50 50 - - 0.75 $1.52
    AD8293G160 Zero Drift Filter Amp Single 1.8V to 5.5V fixed 0.5 160 160 94dB 94dB 0.7 $0.99
    AD8293G80 Zero Drift Filter Amp Single 1.8V to 5.5V fixed 0.5 80 80 94dB 94dB 0.7 $0.99
    AD8295 Precision IA Dual 4.6V to 36V Resistor 750 1 1,000 80dB 130dB 0.25 $2.59
    AD8553 Zero Drift IA Single 1.8V to 5.5V Resistor 1 0.1 10,000 80dB 120dB 0.7 $1.32
    AD8555 Sensor Amp Single 5.5V to 2.7V Software n/a 70 1,280 80dB 96dB 0.5 $3.12
    AD8556 Sen/Filter Amp Single 2.7V to 5.5V Software n/a 70 1,280 80dB 94dB 0.5 $2.88
    AD8557 Sensor Amp Single 2.7V to 5.5V Software - 28 1,300 75dB 86dB - $2.13
    AMP03 Precision Diff Amp Dual 12V to 36V fixed 3000 - - 85dB 85dB 2 $2.81

    * The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    ** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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    This is the acceptable operating range of the device. The various ranges specified are as follows:
    • Commercial: 0 to +70 degrees Celsius
    • Military : -55 to +125 degrees Celsius
    • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
    • Automotive: -40 to +125 degrees Celsius
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    *The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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