AD7689

16-Bit, 4-Channel/8-Channel,250 kSPS PulSAR® 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-AD7689EDZ is a fully featured evaluation Kit for the AD7689. 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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    AD7689 Companion Parts

    Recommended Digital Isolators

    • For SPI Interface, lowest power, 2.5 kVrms isolation , we recommend the ADUM1401 .
    • 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 .
    • For SPI Interface, enhanced system-level ESD performance, 2.5 kVrms isolation , we recommend the ADUM3401 .

    Recommended Driver Amplifiers

    Recommended External Voltage References

    • For low drift and lower cost sensitive applications , we recommend the ADR440 .
    • For low noise, low drift, low power , we recommend the ADR4520 .
    • 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 .

    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.

    AD7689 Material Declaration
    PCN-PDN Information Quality And Reliability Symbols and Footprints

    Discussions

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    AD7689 Discussions

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    Reviews

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    Overview

    4 Reviews
    4 out of 4 (100%) customers recommend this product.
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    Most Helpful Review

    by Anonymous
    The SPI interface is a bit odd (the fact that CS determines sampling), and I had to jump through some hoops to get things going. Luckly the pin I was using for CS was also a timer output. I think if that weren't the case I'd have to redesign the prototype. For comparison, I really appreciate the interface on the AD7767, where I can supply a sampling clock and it tells me when I'm OK to sample data. I couldn't use a 7767 in this product because I needed two single ended inputs.

    Most Recent Review

    by Mr_M_from_G
    I designed a board with AD7689 and developed a microcontroller software to trigger sampling and fetch the data via SPI, everything based on data sheet information. When the board arrived it all worked right from the start. Analog performance is good, the limitations I see are due to the signal sources. The only drawback I see is that there are no real conversion start and busy pins. I had to work around with some timer concatenation that was fortunately possible on my uC

    All Reviews

    by Mr_M_from_G, 3 Feb 15
    first prototype with AD7689
    I designed a board with AD7689 and developed a microcontroller software to trigger sampling and fetch the data via SPI, everything based on data sheet information. When the board arrived it all worked right from the start. Analog performance is good, the limitations I see are due to the signal sources. The only drawback I see is that there are no real conversion start and busy pins. I had to work around with some timer concatenation that was fortunately possible on my uC
    Was this Helpful?Helpful(0)
    by student, 13 Aug 13
    test adc
    this product has a good resolution, which pleased me most is that it has its own internal reference, reducing the number of external components, I recommend it
    Was this Helpful?Helpful(0)
    by Student, 8 Aug 13
    test ADC
    apparently it looks good (for applications with low sampling rate) but I want to make some measurements to see the offset, gain and non-linearities
    Was this Helpful?Helpful(0)
    by Anonymous, 22 Dec 12
    It fit the needs of the product
    The SPI interface is a bit odd (the fact that CS determines sampling), and I had to jump through some hoops to get things going. Luckly the pin I was using for CS was also a timer output. I think if that weren't the case I'd have to redesign the prototype. For comparison, I really appreciate the interface on the AD7767, where I can supply a sampling clock and it tells me when I'm OK to sample data. I couldn't use a 7767 in this product because I needed two single ended inputs.
    Was this Helpful?Helpful(1)

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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.


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    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.