AD8629:  Zero Drift, Single-Supply, Rail-to-Rail, Input/Output Operational Amplifier

This amplifier has ultralow offset, drift, and bias current. The AD8628/AD8629/AD8630 are wide bandwidth auto-zero amplifiers featuring rail-to-rail input and output swing and low noise. Operation is ...More

AD8629:  Zero Drift, Single-Supply, Rail-to-Rail, Input/Output Operational Amplifier

Product Description

This amplifier has ultralow offset, drift, and bias current. The AD8628/AD8629/AD8630 are wide bandwidth auto-zero amplifiers featuring rail-to-rail input and output swing and low noise. Operation is fully specified from 2.7 V to 5 V single supply (±1.35 V to ±2.5 V dual supply).

The AD8628/AD8629/AD8630 provide benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. Using Analog Devices, Inc., topology, these zero-drift amplifiers combine low cost with high accuracy and low noise. No external capacitor is required. In addition, the AD8628/ AD8629/AD8630 greatly reduce the digital switching noise found in most chopper-stabilized amplifiers.

With an offset voltage of only 1 μV, drift of less than 0.005 μV/°C, and noise of only 0.5 μV p-p (0 Hz to 10 Hz), the AD8628/ AD8629/AD8630 are suited for applications where error sources cannot be tolerated. Position and pressure sensors, medical equipment, and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature range. Many systems can take advantage of the rail-to-rail input and output swings provided by the AD8628/AD8629/AD8630 to reduce input biasing complexity and maximize SNR.

The AD8628/AD8629/AD8630 are specified for the extended industrial temperature range (−40°C to +125°C). The AD8628 is available in tiny 5-lead TSOT, 5-lead SOT-23, and 8-lead narrow SOIC plastic packages. The AD8629 is available in the standard 8-lead narrow SOIC and MSOP plastic packages. The AD8630 quad amplifier is available in 14-lead narrow SOIC and 14-lead TSSOP plastic packages.

Applications

  • Automotive sensors
  • Pressure and position sensors
  • Strain gage amplifiers
  • Medical instrumentation
  • Thermocouple amplifiers
  • Precision current sensing
  • Photodiode amplifiers

    • Data Sheet, Rev. G, 6/08

    Features

    • Lowest Auto-zero Amplifier Noise
    • Low Offset Voltage: 1 µV
    • Input Offset Drift: 0.002 µV/°C
    • Rail-to-rail Input and Output Swing
    • 5 V Single-supply Operation
    • High Gain, CMRR, and PSRR: 120 dB
    • Very Low Input Bias Current: 100 pA max
    • See Data Sheet for Additional Information

    Verified Circuits Using This Part

    Verified Circuits are designed for ease of use and proven to work by ADI applications engineers. To learn more about Verified Circuits from ADI, please visit Verified Circuits Home.

    Circuit Diagram

    Diagrams

    AD8629 Diagram
    Pin Configuration Diagram for AD8629

    Specifications

    -3dB Bandwidth 2.5MHz
    Slew Rate 1V/µs
    Vos 1µV
    Ib 30pA
    Input Noise (nV/rtHz) 22nV/rtHz
    Vcc-Vee Supply (V) 2.7 to 6
    Iq per Amplifier (max) 1.1mA
    # OpAmps per Pkg 2
    Operating Temp Range -40 to +125
    Packages SOP,SOIC

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    Part# Small Signal Bandwidth Slew Rate Vos Ib V Noise Density Amplifiers Per Package Widest Temp Range (°C)
    AD8629 2.5MHz 1V/µs 1µV 30pA 22nV/rtHz 2 -40 to +125
    AD8628 2.5MHz 1V/µs 1µV 30pA 22nV/rtHz 1 -40 to +125
    ADA4000-2 5MHz 20V/µs 200µV 5pA 16nV/rtHz 2 -40 to +125
    AD8606 10MHz 5V/µs 20µV 200fA 6.5nV/rtHz 2 -40 to +125
    AD8666 4MHz 3.5V/µs 600µV 200fA 10nV/rtHz 2 -40 to +125
    AD8692 10MHz 5V/µs 400µV 200fA 8nV/rtHz 2 -40 to +125
    AD8602 8.4MHz 6V/µs 500µV 200fA 18nV/rtHz 2 -40 to +125