AD820A Single-Supply, Rail-to-Rail, Low Power FET-Input Op Amp

SKU: 1115388


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AD820A 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 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. Battery-powered precision instrumentation Photodiode preamps Active filters 12-bit to 14-bit data acquisition systems Medical instrumentation Low power references and regulators

Offset voltage of 800 μV maximum, offset voltage drift of 2 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 three 8-lead package options: plastic DIP (PDIP), surface mount (SOIC) and (MSOP).

Features and Benefits
  1. 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
  2. Excellent load drive
    Capacitive load drive up to 350 pF
    Minimum output current of 15 mA
  3. Excellent ac performance for low power
    800 μA maximum quiescent current
    Unity-gain bandwidth: 1.8 MHz
    Slew rate of 3 V/μs
  4. Excellent dc performance
    800 μV maximum input offset voltage
    2 μV/°C typical offset voltage drift
    25 pA maximum input bias current
  5. Low noise: 13 nV/√Hz @ 10 kHz

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