AD7949:  14-Bit, 8-Channel, 250 kSPS PulSAR® ADC

The AD7949 is an 8-channel, 14-bit, charge redistribution successive approximation register (SAR) analog-to-digital converter (ADC) that operates from a single power supply, VDD.

The AD7949 ...続きを見る

AD7949:  14-Bit, 8-Channel, 250 kSPS PulSAR® ADC

製品概要

The AD7949 is an 8-channel, 14-bit, charge redistribution successive approximation register (SAR) analog-to-digital converter (ADC) that operates from a single power supply, VDD.

The AD7949 contains all components for use in a multichannel, low power data acquisition system, including a true 14-bit SAR ADC with no missing codes; an 8-channel, low crosstalk multi-plexer 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 AD7949 uses 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 AD7949 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. A, 5/08

    Features

    • 14-bit resolution with no missing codes
    • 8-channel multiplexer with choice of inputs:
      Unipolar single ended
      Differential (GND sense)
      Pseudobipolar
    • Throughput: 250 kSPS
    • INL/DNL: ±0.5 LSB typical
    • SINAD: 85 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

    AD7949 Diagram
    Functional Block Diagram for AD7949

    仕様

    Resolution (Bits) 14bit
    T-Put Rate 250kSPS
    # Chan 8
    Supply V Single(+2.3 to +5.5)
    Pwr Diss (max) 13.5mW
    Interface Ser,SPI
    SNR (dB) 85.5dB
    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
    AD7949 14 250KSPS 8 13.5mW
    AD7928 12 1MSPS 8 13.5mW
    AD7918 10 1MSPS 8 13.5mW
    AD7812 10 350KSPS 8 10.5mW
    AD7908 8 1MSPS 8 13.5mW
    AD7942 14 250KSPS 1 12.5mW
    AD7856 14 285KSPS 8 89.25mW