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 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).

Data Sheet, Rev. F, 11/08

Features and Benefits
  • 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 V/μs 
  • Excellent dc performance
    800 μV maximum input offset voltage
    2 μV/°C typical offset voltage drift
    25 pA maximum input bias current 
  • Low noise: 13 nV/√Hz @ 10 kHz
  • Amplifiers
    AD820 SPICE Macro-Model
    Data Sheets
    Documentnote
    AD820: Single-Supply, Rail-to-Rail, Low Power, FET-Input Op Amp Data Sheet (Rev. H)PDF 582 kB
    Application Notes
    Documentnote
    AN-106: A Collection of Amp ApplicationsPDF 1094 kB
    AN-358: Noise and Operational Amplifier CircuitsPDF 593 kB
    AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0)PDF 5.3 M
    Frequently Asked Questions
    Documentnote
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD820ANZ Production8 ld PDIPOTH 50-40 to 85C2.282.05Y
    AD820AR Production8 ld SOICOTH 98-40 to 85C2.542.28N
    AD820AR-REEL Production8 ld SOICREEL 2500-40 to 85C02.28N
    AD820AR-REEL7 Production8 ld SOICREEL 750-40 to 85C2.542.28N
    AD820ARMZ Production8 ld MSOPOTH 50-40 to 85C2.181.97Y
    AD820ARMZ-R7 Production8 ld MSOPREEL 1000-40 to 85C01.97Y
    AD820ARMZ-RL Production8 ld MSOPREEL 3000-40 to 85C01.97Y
    AD820ARZ Production8 ld SOICOTH 98-40 to 85C2.181.97Y
    AD820ARZ-REEL Production8 ld SOICREEL 2500-40 to 85C01.97Y
    AD820ARZ-REEL7 Production8 ld SOICREEL 750-40 to 85C2.181.97Y
    AD820BR Production8 ld SOICOTH 98-40 to 85C3.693.33N
    AD820BR-REEL Production8 ld SOICREEL 2500-40 to 85C03.33N
    AD820BRZ Production8 ld SOICOTH 98-40 to 85C3.22.87Y
    AD820BRZ-REEL Production8 ld SOICREEL 2500-40 to 85C02.87Y
    AD820BRZ-REEL7 Production8 ld SOICREEL 750-40 to 85C3.22.87Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    EVAL-PRAOPAMP-1KSZSingle KS-5 lead SC70 Evaluation Board20.19Y
    EVAL-PRAOPAMP-1RJZSingle RJ-5 lead SOT23 Evaluation Board20.19Y
    EVAL-PRAOPAMP-1RMZSingle RM-8 lead MSOP Evaluation Board20.19Y
    EVAL-PRAOPAMP-1RZSingle R-8 lead SOIC Evaluation Board20.19Y
    AD820: Single-Supply, Rail-to-Rail, Low Power, FET-Input Op Amp Data Sheet (Rev. H) ad820
    AD820 SPICE Macro-Model Rev. A, 8/91 ad820
    AD820A SPICE Macro-Model Rev. A, 2/95 ad820
    AD820B SPICE Macro-Model Rev. A, 2/95 ad820
    AN-106: A Collection of Amp Applications ad8532
    AN-358: Noise and Operational Amplifier Circuits ad8072
    AN-358: 噪声与运算放大器电路 (Rev. 0) ad8072
    AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0) ad8350