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AD7689:  16-Bit, 4-Channel/8-Channel,250 kSPS PulSAR® ADC

Product Status:   Production 

The AD7682/AD7689 are 4-channel/8-channel, 16-bit, charge redistribution successive approximation register (SAR) analogto- 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 ...More

AD7689:  16-Bit, 4-Channel/8-Channel,250 kSPS PulSAR® ADC

Product Description

The AD7682/AD7689 are 4-channel/8-channel, 16-bit, charge redistribution successive approximation register (SAR) analogto- 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

      • 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
      • For Additional Information Please Refer to the Datasheet

    AD7689 Functional Block Diagram

    Suggested Companion Products


    Recommended Driver Amplifiers for the AD7689

    • For low noise and high frequency, we suggest the AD8021 or the dual AD8022.
    • For translating +/- 10V signals to 4V, low distortion, fast settling, we recommend the AD8275.
    • For low noise and low frequency at high supply voltages( up to +-18V), we suggest the AD8597, ADA4627-1 or the dual AD8599.
    • For low noise and low frequency applications at medium supply voltages( up to +-13V), we recommend the AD8610, or the dual AD8620.
    * Recommended Voltage References for the AD7689
    • 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 AD7689
    • 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 Power Solutions
    • For selecting voltage regulator products, use ADIsimPower.

    Were these recommendations helpful?

    Budgetary Price & Packaging   |   Samples   |   Check Inventory & Purchase

    AD7689 Model Options
    Model Package Pins Temp.
    Range    		 Packing,
    Qty    		 Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD7689ACPZ Status: Production 20 ld LFCSP 4x4mm (2.5EP 20 Ind Tube, 490 $6.63 $5.99 Y  Material Info PCN Purchase Sample
    AD7689ACPZRL7 Status: Production 20 ld LFCSP 4x4mm (2.5EP 20 Ind Reel, 1500 - $5.99 Y  Material Info PCN Purchase
    AD7689BCPZ Status: Production 20 ld LFCSP 4x4mm (2.5EP 20 Ind Tube, 490 $7.82 $7.07 Y  Material Info PCN Purchase Sample
    AD7689BCPZRL7 Status: Production 20 ld LFCSP 4x4mm (2.5EP 20 Ind Reel, 1500 - $7.07 Y  Material Info PCN Purchase
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    Package Description
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    Temperature Range
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    • Commercial: 0 to +70 degrees Celsius
    • Military : -55 to +125 degrees Celsius
    • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
    • Automotive: -40 to +125 degrees Celsius
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    View PCN/PDN
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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.

    AD7689 Evaluation Kit
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    EVAL-AD7689EDZ Status: Production Evaluation Board $99.00 Yes -
    EVAL-CED1Z Status: Production Evaluation Board $249.00 Yes -

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    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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