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
    Circuits from the Lab

    Find more at our Circuits Library.

    Products Used in This Circuit:
    AD7366, AD7367, AD8021, AD845, AD8610, AD8638, OP07D, OP177

    Circuit Types:  ADC Circuit/Driver
    Applications:  Instrumentation; Medical; Process Control

    Products Used in This Circuit:
    AD7356, AD8138, AD8638, OP07D, OP177

    Circuit Types:  ADC Circuit/Driver
    Applications:  Instrumentation; Medical; Process Control
    Optimized For:  High Performance; Low Noise and Distortion

    Products Used in This Circuit:
    AD7352, AD8138, AD8638, OP07D, OP177

    Circuit Types:  ADC Circuit/Driver
    Applications:  Instrumentation; Medical; Process Control
    Optimized For:  High Performance; Low Noise and Distortion

    Diagrams

    AD8638 Diagram
    Pin Configuration Diagram for AD8638

    Specifications

    -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
    Iq per Amplifier 1.5mA
    # OpAmps per Pkg 1
    Operating Temp Range -40 to +125
    Packages SOIC,SOT-23

    Explore Other Products

    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
    Pricing, Packaging & Availability

    Help

    Model
    The model number is a specific version of a generic that can be purchased or sampled.

    Status
    Status indicates the current lifecycle of the product. This can be one of 4 stages:
    • Pre-Release: The model has not been released to general production, but samples may be available.
    • Production: The model is currently being produced, and generally available for purchase and sampling.
    • Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.
    • Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).
    Package Description
    The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

    For detailed drawings and chemical composition please consult our  Package Site

    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
    Price
    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.

    Production Availability
    This is the date Analog Devices, Inc. anticipates that the product will ship from the warehouse. Most orders ship within 48 hours of this date.Once an order has been placed, Analog Devices, Inc. will send an Order Acknowledgement email to confirm your delivery date. It is important to note the scheduled dock date on the order entry screen. We do take orders for items that are not in stock, so delivery may be scheduled at a future date. Also, please note the warehouse location for the product ordered. We have warehouses in the United States, Europe and Southeast Asia. Transit times from these sites may vary.
    Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

    RoHS Compliant
    Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.

    *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.

    View Sales and Distribution Offices