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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 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 ...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

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    • 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
    • Iq per Amplifier: 1.5mA
    • # OpAmps per Pkg: 1
    • Operating Temp Range: -40 to +125
    • Packages: SOIC,SOT-23
    • -3dB Bandwidth: 1.5MHz
    • Slew Rate: 2V/µs
    • Vos: 3µV
    • Ib: 1pA
    • Input Noise (nV/rtHz): 59nV/rtHz
    • Vcc-Vee Supply (V): 5 to 16

    Pin Configuration Diagram for AD8638

    Circuits from the Lab

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    Similar Products

    arrow View Full Interactive Product Selection Table
    Part# Small Signal Bandwidth Slew Rate Vos Ib V Noise Density Amplifiers Per Package Widest Temp Range (°C)
    AD8638 1.5MHz 2V/µs 3µV 1pA 59nV/rtHz 1 -40 to +125
    AD8661 4MHz 3.5V/µs 30µV 300fA 12nV/rtHz 1 -40 to +125
    AD8641 3.5MHz 3V/µs 50µV 250fA 27.5nV/rtHz 1 -40 to +125
    AD8605 10MHz 5V/µs 20µV 200fA 6.5nV/rtHz 1 -40 to +125
    AD8665 4MHz 3.5V/µs 600µV 200fA 10nV/rtHz 1 -40 to +125
    AD8691 10MHz 5V/µs 400µV 200fA 6.5nV/rtHz 1 -40 to +125
    AD8601 8.4MHz 6V/µs 500µV 200fA 18nV/rtHz 1 -40 to +125
    AD8615 23MHz 12V/µs 80µV 200fA 7nV/rtHz 1 -40 to +125
    AD8651 50MHz 41V/µs 100µV 1pA 4.5nV/rtHz 1 -40 to +125
    AD8639 1.5MHz 2V/µs 3µV 1pA 80nV/rtHz 2 -40 to +125
    AD8642 3.5MHz 3V/µs 50µV 250fA 27.5nV/rtHz 2 -40 to +125
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    Pin Count
    Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

    Temperature Range
    This is the acceptable operating range of the device. The various ranges specified are as follows:
    • Commercial: 0 to +70 degrees Celsius
    • Military : -55 to +125 degrees Celsius
    • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
    • Automotive: -40 to +125 degrees Celsius
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    *The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.