AD820:  Single-Supply, Rail-to-Rail, Low Power FET-Input Op Amp

The AD820 is a precision, low power FET input op amp that can operate from a single supply of 5.0 V to 36 V, or dual supplies of ±2.5 V to ±18 V. It has true single-supply capability, with an ...More

AD820:  Single-Supply, Rail-to-Rail, Low Power FET-Input Op Amp

Product Description

The AD820 is a precision, low power FET input op amp that can operate from a single supply of 5.0 V to 36 V, or dual supplies of ±2.5 V to ±18 V. It has true single-supply capability, with an input voltage range extending below the negative rail, allowing the AD820 to accommodate input signals below ground in the single-supply mode. Output voltage swing extends to within 10 mV of each rail, providing the maximum output dynamic range.

Offset voltage of 800 μV maximum, offset voltage drift of 1 μV/°C, typical input bias currents below 25 pA, and low input voltage noise provide dc precision with source impedances up to 1 GΩ. 1.8 MHz unity gain bandwidth, −93 dB THD at 10 kHz, and 3 V/μs slew rate are provided for a low supply current of 800 μA. The AD820 drives up to 350 pF of direct capacitive load and provides a minimum output current of 15 mA. This allows the amplifier to handle a wide range of load conditions. This combination of ac and dc performance, plus the outstanding load drive capability, results in an exceptionally versatile amplifier for the single-supply user.

The AD820 is available in two performance grades. The A and B grades are rated over the industrial temperature range of −40°C to +85°C. The AD820 is offered in two 8-lead package options: plastic DIP (PDIP) and surface mount (SOIC).

Applications

  • Battery-powered precision instrumentation
  • Photodiode preamps
  • Active filters
  • 12- to 14-bit data acquisition systems
  • Medical instrumentation
  • Low power references and regulators

    • Data Sheet, Rev. E, 2/07

    Features

    • True single-supply operation
      Output swings rail-to-rail
      Input voltage range extends below ground
      Single-supply capability from 5 V to 36 V
      Dual-supply capability from ±2.5 V to ±18 V
    • Excellent load drive
      Capacitive load drive up to 350 pF
      Minimum output current of 15 mA
    • Excellent ac performance for low power
      800 μA maximum quiescent current
      Unity gain bandwidth: 1.8 MHz
      Slew rate of 3.0 V/μs
    • Excellent dc performance
      800 μV maximum input offset voltage
      1 μV/°C typical offset voltage drift
      25 pA maximum input bias current
    • Low noise
      13 nV/√Hz @ 10 kHz

    Diagrams

    AD820 Diagram
    Pin Configuration Diagram for AD820

    Specifications

    -3dB Bandwidth 1.9MHz
    Slew Rate 3V/µs
    Vos 100µV
    Ib 2pA
    Input Noise (nV/rtHz) 13nV/rtHz
    Vcc-Vee Supply (V) 5 to 36
    Iq per Amplifier (max) 900µA
    # OpAmps per Pkg 1
    Operating Temp Range -40 to +85
    Packages DIP,SOIC

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    Part# Small Signal Bandwidth Slew Rate Vos Ib V Noise Density Amplifiers Per Package Widest Temp Range (°C)
    AD820 1.9MHz 3V/µs 100µV 2pA 13nV/rtHz 1 -40 to +85
    AD8661 4MHz 3.5V/µs 30µV 300fA 12nV/rtHz 1 -40 to +125
    AD8605 10MHz 5V/µs 20µV 200fA 6.5nV/rtHz 1 -40 to +125
    AD8615 23MHz 12V/µs 80µV 200fA 7nV/rtHz 1 -40 to +125
    AD8610 25MHz 60V/µs 75µV 2pA 6nV/rtHz 1 -40 to +125
    AD8651 50MHz 41V/µs 100µV 1pA 4.5nV/rtHz 1 -40 to +125
    AD822 1.9MHz 3V/µs 100µV 2pA 13nV/rtHz 2 -40 to +85