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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

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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

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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.