AD8638:  16 V Auto-Zero, Rail-to-Rail Output Operational Amplifier

The AD8638/AD8639 are single and dual wide bandwidth, auto-zero amplifiers featuring rail-to-rail output swing and low noise. These amplifiers have very low offset, drift, and bias current. Operation ...More

AD8638:  16 V Auto-Zero, Rail-to-Rail Output Operational Amplifier

Product Description

The AD8638/AD8639 are single and dual wide bandwidth, auto-zero amplifiers featuring rail-to-rail output swing and low noise. These amplifiers have very low offset, drift, and bias current. Operation is fully specified from 5 V to 16 V single supply (±2.5 V to ±8 V dual supply).

The AD8638/AD8639 provide benefits previously found only in expensive zero-drift or chopper-stabilized amplifiers. Using the Analog Devices, Inc., topology, these auto-zero amplifiers combine low cost with high accuracy and low noise. No external capacitors are required. In addition, the AD8638/AD8639 greatly reduce the digital switching noise found in most chopper- stabilized amplifiers.

With a typical offset voltage of only 3 μV, drift of 0.01 μV/°C, and noise of 1.2 μV p-p (0.1 Hz to 10 Hz), the AD8638/AD8639 are suited for applications in which 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 ranges. Many systems can take advantage of the rail-to-rail output swing provided by the AD8638/AD8639 to maximize signal-to-noise ratio (SNR).

The AD8638/AD8639 are specified for the extended industrial temperature range (−40°C to +125°C). The single AD8638 is available in tiny 5-lead SOT-23 and 8-lead SOIC packages. The dual AD8639 is available in 8-lead MSOP, 8-lead SOIC, and 8-lead LFCSP packages.

The AD8638/AD8639 are members of a growing series of auto- zero op amps offered by Analog Devices (see Table 1 in the data sheet).

Applications

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

    • Features

    • Low offset voltage: 9 μV maximum
    • Offset drift: 0.04 μV/°C maximum
    • Rail-to-rail output swing
    • 5 V to 16 V single-supply or ±2.5 V to ±8 V dual-supply operation
    • High gain: 136 dB typical
    • High CMRR: 133 dB typical
    • High PSRR: 143 dB typical
    • Very low input bias current: 40 pA maximum
    • Low supply current: 1.3 mA maximum

    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

    AD8638 Diagram
    Pin Configuration Diagram for AD8638

    Specifications

    -3dB Bandwidth 1.5MHz
    Vos 3µV
    Ib 20pA
    Input Noise (nV/rtHz) 59nV/rtHz
    Vcc-Vee Supply (V) 5 to 16
    # OpAmps per Pkg 1
    Operating Temp Range -40 to +125
    Packages SOIC,SOT-23

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    Part# Small Signal Bandwidth Vos Ib V Noise Density Amplifiers Per Package Widest Temp Range (°C)
    AD8551 1.5MHz 1µV 10pA 42nV/rtHz 1 -40 to +125
    AD8571 1.5MHz 1µV 10pA 51nV/rtHz 1 -40 to +125
    AD8638 1.5MHz 3µV 20pA 59nV/rtHz 1 -40 to +125
    AD8552 1.5MHz 1µV 10pA 42nV/rtHz 2 -40 to +125
    AD8572 1.5MHz 1µV 10pA 51nV/rtHz 2 -40 to +125
    AD8628 2.5MHz 1µV 30pA 22nV/rtHz 1 -40 to +125
    AD8538 430KHz 5µV 15pA 50nV/rtHz 1 -40 to +125