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AD8220:  JFET Input Instrumentation Amplifier with Rail-to-Rail Output in MSOP Package

The AD8220 is the first single-supply, JFET input instrumentation amplifier available in an MSOP package. Designed to meet the needs of high performance, portable instrumentation, the AD8220 has a minimum common-mode rejection ratio (CMRR) of 86 dB at dc and a minimum CMRR of 80 dB at 5 kHz for G = 1. Maximum input bias current is 10 pA and typically remains below 300 pA over the entire industrial ...More

AD8220:  JFET Input Instrumentation Amplifier with Rail-to-Rail Output in MSOP Package

Product Description

The AD8220 is the first single-supply, JFET input instrumentation amplifier available in an MSOP package. Designed to meet the needs of high performance, portable instrumentation, the AD8220 has a minimum common-mode rejection ratio (CMRR) of 86 dB at dc and a minimum CMRR of 80 dB at 5 kHz for G = 1. Maximum input bias current is 10 pA and typically remains below 300 pA over the entire industrial temperature range. Despite the JFET inputs, the AD8220 typically has a noise corner of only 10 Hz.

With the proliferation of mixed-signal processing, the number of power supplies required in each system has grown. The AD8220 is designed to alleviate this problem. The AD8220 can operate on a ±18 V dual supply, as well as on a single +5 V supply. Its rail-to-rail output stage maximizes dynamic range on the low voltage supplies common in portable applications. Its ability to run on a single 5 V supply eliminates the need to use higher voltage, dual supplies. The AD8220 draws a maximum of 750 μA of quiescent current, making it ideal for battery powered devices.

Gain is set from 1 to 1000 with a single resistor. Increasing the gain increases the common-mode rejection. Measurements that need higher CMRR when reading small signals benefit when the AD8220 is set for large gains.

A reference pin allows the user to offset the output voltage. This feature is useful when interfacing with analog-to-digital converters.

The AD8220 is available in an MSOP that takes roughly half the board area of an SOIC. Performance is specified over the industrial temperature range of −40°C to +85°C.

Applications

  • LCD gamma and VCOM drivers
  • Medical instrumentation
  • Precision data acquisition
  • Transducer interfaces

    • Data Sheet, Rev. A, 5/07

    RESOURCES & TOOLS

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    • High CMRR
      100 dB CMRR (minimum), G = 10 (B Grade)
      80 dB CMRR (minimum) to 5 kHz, G = 1 (B Grade)
    • Excellent ac specifications and low power
      1.5 MHz bandwidth (G = 1)
      14 nV/√Hz input noise (1 kHz)
      Slew rate: 2 V/μs
      750 μA quiescent supply current (maximum)
    • Low input currents
      10 pA maximum input bias current (B Grade)
      0.6 pA maximum input offset current (B Grade)
    • Versatile
      MSOP package
      Rail-to-rail output
      Input voltage range to below negative supply rail
      4 kV ESD protection
      4.5 V to 36 V single supply
      ±2.25 V to ±18 V dual supply
      Gain set with single resistor (G = 1 to 1000)
    • Single/Dual Supply: Single/Dual
    • Voltage Supply (Vmax) : +36V
    • Gain Setting Method: Resistor
    • Gain Range (min to max): 1000
    • Bandwidth G=10 (kHz typ): 800kHz
    • CMRR (dB): 100dB
    • Vnoise RTI 1-10 Hz µVp-p : 0.8µV p-p
    • Temperature Range: -40 to +85
    • Gain Error (%) max: +0.04%
    • Supply Current : 750µA
    • Package: MSOP
    • Vosi (µV): 125µV

    Pin Configuration for AD8220

    Circuits from the Lab

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    OF NOTE ...

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