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AD7682:  16-Bit, 4-Channel/8-Channel,250 kSPS® ADC

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
  • FEATURES and BENEFITS

    • Chinese data sheet available
    • 16-bit resolution with no missing codes
    • 4-channel (AD7682)/8-channel (AD7689) multiplexer with:
         choice of inputs
         Unipolar single-ended
         Differential (GND sense)
         Pseudobipolar
    • Throughput: 250 kSPS
    • INL: ±0.4 LSB typical, ±1.5 LSB maximum (±23 ppm or FSR)
    • Dynamic range: 93.8 dB
    • SINAD: 92.5 dB @ 20 kHz
    • THD: −100 dB @ 20 kHz
    • Analog input range: 0 V to VREF with VREF up to VDD
    • See data sheet for additional features

    Functional Block Diagram for AD7682

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    Additional Information

    For additional ADI Healthcare Products and related information, please visit www.analog.com/healthcare.

    Documentation

    Title Content Type File Type
    AD7682/AD7689: 16-Bit, 4-Channel/8-Channel, 250 kSPS PulSAR ADC Datasheet (Rev D, 04/2012) (pdf, 2507 kB) Data Sheets PDF
    AN-1141: Powering a Dual Supply Precision ADC with Switching Regulators  (pdf, 640 kB) Application Notes PDF
    AN-931: Understanding PulSAR ADC Support Circuitry  (pdf, 299 kB)
    This application note discusses in general the pitfalls that occur regularly when using SAR ADCs and, more importantly, how to easily prevent them.
    Application Notes PDF
    AN-932: Power Supply Sequencing  (pdf, 95 kB) Application Notes PDF
    AN-877: Interfacing to High Speed ADCs via SPI  (pdf, 1594 kB) Application Notes PDF
    AN-935: Designing an ADC Transformer-Coupled Front End  (pdf, 363 kB) Application Notes PDF
    AN-742: Frequency Domain Response of Switched-Capacitor ADCs  (pdf, 401 kB) Application Notes PDF
    The Data Conversion Handbook Design Handbooks HTML
    MT-031: Grounding Data Converters and Solving the Mystery of  (pdf, 144 kB) Tutorials PDF
    MT-002: What the Nyquist Criterion Means to Your Sampled Data System Design  (pdf, 152 kB) Tutorials PDF
    MT-001: Taking the Mystery out of the Infamous Formula, "SNR=6.02N + 1.76dB," and Why You Should Care  (pdf, 94 kB) Tutorials PDF
    EVAL-AD76MUXEDZ: Evaluation Board For AD7682/89/99/7949 PulSAR® ADCs (Preliminary, Rev. PrD)  (pdf, 4664 kB) User Guides PDF
    MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
    MS-2124: Understanding AC Behaviors of High Speed ADCs  (pdf, 276 kB) Technical Articles PDF
    Nine Often Overlooked ADC Specifications  (pdf, 445 kB)
    Analog-to-digital converters (ADCs) have many specifications; some are more important for a given application than others. Understanding these specifications and controlling external devices affecting the ADC will lead to better performance.
    Technical Articles PDF
    SAR ADC & Driver Quick-Match Guide  (pdf, 251 kB)
    Find drivers for ADI's most popular single-ended and differential SAR ADCs based on your specific application conditions.
    Product Selection Guide PDF
    Industrial ICs
    Industrial ICs Solutions Bulletin, Volume 10, Issue 8
    Solutions Bulletins HTML
    RAQs index Rarely Asked Questions HTML
    Glossary of EE Terms Glossary HTML

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    CED1Z FPGA Project for AD7682 with Nios driver (Wiki Site) Device Drivers HTML

    Evaluation Kits & Symbols & Footprints

    Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

    Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

    Product Recommendations & Reference Designs

    Companion Products

    Suggested Companion Products


    Recommended Driver Amplifiers for the AD7682

    Recommended External Voltage References for the AD7682
    • For low drift and high current output applications, we recommend the ADR430 family.
    • For low drift and lower cost sensitive applications, we recommend the ADR440 family.
    Recommended Voltage Regulators for the AD7682
    • For low dropout regulators with inputs up to 5V, we recommend the low noise ADP151 or the low power ADP160.
    • For high current switching regulators with inputs up to 5V, we recommend the low noise ADP2114.

    Recommended Digital Isolators for the AD7682
    • 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, low power, 5.0 kVrms isolation, we recommend the ADuM4401.
    • For SPI Interface, smallest package, low voltage I/O (1.8 V to 5.5 V), we recommend the ADuM3481.
    Recommended Power Solutions for the AD7682
    • For input voltages up to 5.5V we would recommend the ADM7160.
    • For input voltages up to 20V we would recommend the ADP7118.
    Recommended Power Solutions
    • For selecting voltage regulator products, use ADIsimPower.

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    Price, packaging, availability

    AD7682 Model Options
    Price Table Help

    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.

    AD7682 Evaluation Kit
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    EVAL-AD7682EDZ Status: Production Evaluation Board $99.00 Yes -
    EVAL-CED1Z Status: Production Evaluation Board $249.00 Yes -

    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.

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