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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.


  • Battery Powered Equipment
  • Data acquisitions
  • Instrumentation
  • Medical instruments
  • Process controls

    • 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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    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.

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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.
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    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/
    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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