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AD7687:  16-Bit, 1.5 LSB INL, 250 kSPS PulSAR™ Differential ADC in MSOP/QFN

Product Details


The AD7687 is a 16-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD, between 2.3 V to 5.5 V. It contains a low power, high speed, 16-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. The part also contains a low noise, wide bandwidth, short aperture delay track-and-hold circuit. On the CNV rising edge, it samples the voltage difference between IN+ and IN− pins. The voltages on these pins usually swing in opposite phase between 0 V to REF. The reference voltage, REF, is applied externally and can be set up to the supply voltage.

Its power scales linearly with throughput.

The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single, 3-wire bus and provides an optional BUSY indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate supply VIO.

The AD7687 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.

Applications

  • Battery Powered Equipment
  • Data acquisitions
  • Instrumentation
  • Medical instruments
  • Process controls
  • FEATURES and BENEFITS

    • 16 Bits Resolution with No Missing 16-Bit Codes
    • Throughput: 250 kSPS
    • INL: ±0.4 LSB typ, ±1.5 LSB max (±23 ppm of FSR)
    • Dynamic range: 96.5 dB
    • S/(N + D): 95.5 dB @ 20 kHz
    • THD: −118 dB @ 20 kHz
    • True differential analog input range ±VREF 0 V to VREF with VREF up to VDD on both inputs
    • No pipeline delay
    • Single-supply 2.3 V to 5.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
    • Serial interface SPI®/QSPI™/MICROWIRE™/DSP-compatible
    • Daisy-chain multiple ADCs and BUSY indicator
    • Power dissipation: 1.35 mW @ 2.5 V/100 kSPS, 4 mW @ 5 V/100 kSPS, and 1.4 μW @ 2.5 V/100 SPS

    Functional Block Diagram for AD7687

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    Documentation

    Title Content Type File Type
    AD7687: 16-Bit, 1.5 LSB INL, 250 kSPS PulSAR Differential ADC in MSOP Data Sheet (Rev C, 07/2014) (pdf, 723 kB) Data Sheets PDF
    Tested ADC Driver to PulSAR ADC Application Notes HTML
    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-935: Designing an ADC Transformer-Coupled Front End  (pdf, 363 kB) Application Notes PDF
    CN-0225: High Impedance, High CMR, ±10 V Analog Front End Signal Conditioner for Industrial Process Control and Automation  (pdf, 640 kB) Circuit Note PDF
    MT-074: Differential Drivers for Precision ADCs  (pdf, 249 kB) Tutorials PDF
    UG-682: 6-Lead SOT-23 ADC Driver for the 8-/10-Lead Family of 14-/16-/18-Bit PulSAR ADC Evaluation Boards  (pdf, 433 kB) User Guides PDF
    UG-340: Evaluation Board for the 10-Lead Family 14-/16-/18-Bit PulSAR ADCs  (pdf, 4636 kB) User Guides PDF
    MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
    MS-2022: Seven Steps to Successful Analog-to-Digital Signal Conversion (Noise Calculation for Proper Signal Conditioning)  (pdf, 277 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
    High Speed Op Amp Drives a 16-Bit, 1-MSPS Differential-Input A/D Converter
    (Analog Dialogue, Vol. 36, No. 6, November/December 2002)
    Analog Dialogue HTML
    Low-Power Data Conversion Technology Enhances Portability
    (Electropages, 10/5/2006)
    Product Reviews HTML
    Lowest-Power 16-Bit ADC Optimizes Portable Designs
    (eeProductCenter, 10/4/2006)
    Product Reviews HTML
    8- to 18-Bit SAR ADCs ... From the Leader in High Performance Analog  (pdf, 1885 kB)
    8- to 18-Bit SAR ADCs with Sample Rates up to 3 MSPS -- The latest additions to ADI’s ADC portfolio offer unrivaled functionality in terms of channel count and power supply voltage, optimal power/speed ratios, and the smallest packages to meet the demands of any data acquisition application, including portable, industrial, medical, wireless, and communications.
    Overview PDF
    High Speed, High Accuracy 14-Bit, 16-Bit, and 18-Bit PulSAR ADCs  (pdf, 3826 kB)
    A PulSAR Family Brochure (6/2006)
    Overview PDF
    RAQs index Rarely Asked Questions HTML
    Glossary of EE Terms Glossary HTML

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    AD7685 IBIS Models IBIS Models HTML
    BeMicro FPGA Project for AD7687 with Nios driver FPGA HDL HTML
    AD7687 FMC-SDP Interposer & Evaluation Board / Xilinx KC705 Reference Design FPGA HDL 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

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    Companion Products

    Suggested Companion Products


    Recommended Driver Amplifiers for the AD7687
    • For low frequency and low bias current, we recommend the ADA4627-1.

    • For translating +/- 10V signals to 4V, low distortion, fast settling, we recommend the AD8275.
    Recommended Voltage Reference for the AD7687
    • For low dropout 2.5V reference, we recommend the ADR391 with the AD8605 or AD8031 buffer amplifier.
    • For best performance, we recommend the ADR435 (5V).
    Recommended Power Solutions
    • For selecting voltage regulator products, use ADIsimPower.

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    Price, packaging, availability

    AD7687 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD7687BCPZRL Status: Last Time Buy 10 ld LFCSP (3x3mm) 10 Ind Reel, 5000 - $9.06 Y  Material Info PDN Purchase
    AD7687BCPZRL7 Status: Production 10 ld LFCSP (3x3mm) 10 Ind Reel, 1500 - $9.06 Y  Material Info Notify Me Purchase Sample
    AD7687BRMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $10.02 $9.06 Y  Material Info PCN Purchase Sample
    AD7687BRMZRL7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 - $9.06 Y  Material Info PCN Purchase
    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.

    AD7687 Evaluation Kit
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    EVAL-AD7687-PMDZ Status: Production Evaluation Board PMOD compatible form factor $27.00 Yes -
    EVAL-AD7687SDZ Status: Production Evaluation Board SDP Interface $99.00 Yes -
    EVAL-SDP-CB1Z Status: Production Evaluation Controller Board SDP $99.00 Yes -
    SDP-PMD-IB1Z Status: Production Evaluation Interposer Board PMOD to SDP w/ Power Supply $55.00 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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