AD7682

16-Bit, 4-Channel/8-Channel,250 kSPS® ADC
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Product Details

The AD7682/AD7689 are 4-channel/8-channel, 16-bit, charge redistribution successive approximation register (SAR) analog-to-digital converters (ADCs) that operate from a single power supply, VDD.

The AD7682/AD7689 contain all components for use in a multichannel, low power data acquisition system, including a true 16-bit SAR ADC with no missing codes; a 4-channel (AD7682) or 8-channel (AD7689), low crosstalk multiplexer that is useful for configuring the inputs as single-ended (with or without ground sense), differential, or bipolar; an internal low drift reference (selectable 2.5 V or 4.096 V) and buffer; a temperature sensor; a selectable one-pole filter; and a sequencer that is useful when channels are continuously scanned in order.

The AD7682/AD7689 use a simple SPI interface for writing to the configuration register and receiving conversion results. The SPI interface uses a separate supply, VIO, which is set to the host logic level. Power dissipation scales with throughput.

The AD7682/AD7689 are housed in a tiny 20-lead LFCSP with operation specified from −40°C to +85°C.

Applications

  • Multichannel system monitoring
  • Battery-powered equipment
  • Medical instruments: ECG/EKG
  • Mobile communications: GPS
  • Power line monitoring
  • Data acquisition
  • Seismic data acquisition systems
  • Instrumentation
  • Process control
  • Product Lifecycle

    checked Production

    At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

    Evaluation Kits

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    Product Details

    The EVAL-AD7682EDZ is a fully featured evaluation Kit for the AD7682. This board operates in stand alone mode or in conjunction with the Converter Evaluation and Development board, EVAL-CED1Z . When operated with the Converter Evaluation and Development board, software is provided enabling the user to perform detailed analysis of the ADC's performance. This software includes the technical note describing the operation and set up of the evaluation board in standalone operation or when operated with the Converter Evaluation and Development board.

    Documentation

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    Software & Systems Requirements

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    Product Recommendations

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    AD7682 Companion Parts

    Recommended Digital Isolators

    • For SPI Interface, lowest power, 2.5 kVrms isolation , we recommend the ADUM1401 .
    • For SPI Interface, enhanced system-level ESD performance, 2.5 kVrms isolation , we recommend the ADUM3401 .
    • For SPI Interface, smallest package, low voltage I/O (1.8 V to 5.5 V) , we recommend the ADUM3481 .
    • For SPI Interface, low power, 5.0 kVrms isolation , we recommend the ADUM4401 .

    Recommended Driver Amplifiers

    Recommended External Voltage References

    • For low drift and lower cost sensitive applications , we recommend the ADR440 .
    • For low drift and high current output applications , we recommend the ADR430 .

    Recommended Voltage Regulators

    • For low dropout regulators with inputs up to 5V , we recommend the ADP151 or the ADP160 .
    • For high current switching regulators with inputs up to 5V , we recommend the ADP2114 .

    Reference Materials

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    Design Resources

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    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

    AD7682 Material Declaration
    PCN-PDN Information Quality And Reliability Symbols and Footprints

    Reviews

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    Overview

    1 Review
    1 out of 1 (100%) customers recommend this product.
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    Most Helpful Review

    by Anonymous
    the device is excellent, however the data sheet is not particularly user friendly. the chip is actually quite simple to use, so clarification of timing diagrams and also explanation of modes of operation would have been helpful in getting started. cheers!

    All Reviews

    by Anonymous, 24 Jan 13
    a excellent device, however the data sheet timing diagrams are very confusing, also same goes for the deion of modes of opperation
    the device is excellent, however the data sheet is not particularly user friendly. the chip is actually quite simple to use, so clarification of timing diagrams and also explanation of modes of operation would have been helpful in getting started. cheers!
    Was this Helpful?Helpful(2)

    Sample & Buy

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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.


    Price Table Help

     
    Evaluation Boards Pricing displayed is based on 1-piece.
    Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.