AD7682:  16-Bit, 4-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, ...続きを見る

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

製品概要

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 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.

Each AD7682/AD7689 is housed in a tiny 20-lead LFCSP with operation specified from −40°C to +85°C.

Applications

  • Battery-powered equipment
  • Medical instruments: ECG/EKG
  • Mobile communications: GPS
  • Personal digital assistants
  • Power line monitoring
  • Data acquisition
  • Seismic data acquisition systems
  • Instrumentation
  • Process control

    • Data Sheet, Rev. 0, 5/08

    Features

    • 16-bit resolution with no missing codes
    • 4-channel multiplexer with:
      Unipolar single ended or Differential (GND sense)/psuedo-bipolar inputs
    • Throughput: 250 kSPS
    • INL/DNL: ±0.6 LSB typical
    • 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 Information

    Diagrams

    AD7682 Diagram
    Functional Block Diagram for AD7682

    仕様

    Resolution (Bits) 16bit
    T-Put Rate 250kSPS
    # Chan 4
    Supply V Multi(+3, +5),Multi(+3.3, +5),Multi(+3.3Anlg, +3.3Dig),Single(+2.7 to +5.5),Single(+2.7),Single(+3),Single(+3.3),Single(+5)
    Pwr Diss (max) 19.2mW
    Interface Ser,SPI
    Ain Range Bip (Vref) x 0.5,Uni (Vref)
    SNR (dB) 93.5dB
    Pkg Type CSP

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    新製品情報のRSSフィードを取得 続きを見る
    Part# Res Throughput Rate # of Inputs Operating Pwr Diss
    AD7682 16 250KSPS 4 19.2mW
    AD7980 16 1MSPS 1 10mW
    AD7687 16 250KSPS 1 12.5mW
    AD7983 16 1.33MSPS 1 12mW
    AD7694 16 250KSPS 1 6.3mW
    AD7934 12 1.5MSPS 4 16mW
    AD7689 16 250KSPS 8 19.2mW