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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 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 ...More

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

Product Description

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

  • Multichannel system monitoring
  • 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. B, 5/09

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    EVALUATION BOARDS & DEVELOPMENT KITS

    • 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/±0.25 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
    • Resolution (Bits): 14bit
    • T-Put Rate: 250kSPS
    • # Chan: 8
    • Supply V: Single(+2.3 to +5.5)
    • Pwr Diss: 13.5mW
    • Interface: Ser,SPI
    • SNR (dB): 85.5dB
    • Pkg Type: CSP

    Functional Block Diagram for AD7949

    Similar Products

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    Part# Bits 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
    AD9252 14 50MSPS 8 773mW
    AD7924 12 1MSPS 4 13.5mW
    AD7914 10 1MSPS 4 13.5mW
    AD7811 10 350KSPS 4 10.5mW
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    Pricing, Packaging & Availability

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    Temperature Range
    This is the acceptable operating range of the device. The various ranges specified are as follows:
    • 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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    *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.