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

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 ...More

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

Product Description

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

    • Data Sheet, Rev. B, 6/09

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    EVALUATION BOARDS & DEVELOPMENT KITS

    • 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
    • Resolution (Bits): 16bit
    • T-Put Rate: 250kSPS
    • # Chan: 8
    • Supply V: Multi(+3, +5),Multi(+3.3, +5),Single(+2.7 to +5.5),Single(+2.7),Single(+3),Single(+3.3),Single(+5)
    • Pwr Diss: 19.2mW
    • Interface: Ser,SPI
    • Ain Range: (Vref) p-p,Bip (Vref) x 0.5,Uni (Vref)
    • SNR (dB): 93.5dB
    • Pkg Type: CSP

    AD7689 Functional Block Diagram

    Similar Products

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    Part# Bits Throughput Rate # of Inputs Operating Pwr Diss
    AD7689 16 250KSPS 8 19.2mW
    AD7949 14 250KSPS 8 13.5mW
    AD7938 12 1.5MSPS 8 16mW
    AD7682 16 250KSPS 4 19.2mW
    AD7327 13 500KSPS 8 17mW
    AD7928 12 1MSPS 8 13.5mW
    AD7939 10 1.5MSPS 8 16mW
    AD7918 10 1MSPS 8 13.5mW
    AD7812 10 350KSPS 8 10.5mW
    AD7980 16 1MSPS 1 10mW
    AD7687 16 250KSPS 1 12.5mW
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    Pricing, Packaging & Availability

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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.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.