AD7942:  14-Bit, 250 kSPS PulSAR®, Pseudo Differential ADC in MSOP/QFN

The AD7942 is a 14-bit, charge redistribution, successive approximation PulSAR® ADC that operates from a single power supply, VDD, between 2.3 V to 5.5 V. It contains a low power, high speed, 14-bit ...More

AD7942:  14-Bit, 250 kSPS PulSAR®, Pseudo Differential ADC in MSOP/QFN

Product Description

The AD7942 is a 14-bit, charge redistribution, successive approximation PulSAR® ADC that operates from a single power supply, VDD, between 2.3 V to 5.5 V. It contains a low power, high speed, 14-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. The part also contains a low noise, wide bandwidth, short aperture delay track-and-hold circuit. On the CNV rising edge, it samples an analog input, IN+, between 0 V to VREF with respect to a ground sense, IN−. The reference voltage, VREF, is applied externally and is set up to be the supply voltage. Its power scales linearly with the throughput.

The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and provides an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic using a separate supply (VIO).

The AD7942 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) package yet fits in the same size footprint as the 8-lead MSOP or SOT-23. Operation for the AD7942 is specified from −40°C to +85°C.

Applications

  • Battery-powered equipment
  • Data acquisition
  • Instrumentation
  • Medical instruments
  • Process controls

    • Data Sheet, Rev. B, 6/08

    Features

    • 14-bit resolution with no missing codes
    • Throughput: 250 kSPS
    • INL: ±0.4 LSB typical, ±1 LSB maximum (±0.0061% of FSR)
    • SINAD: 85 dB @ 20 kHz
    • THD: −100 dB @ 20 kHz
    • Pseudo differential analog input range
      0 V to VREF with VREF up to VDD
    • No pipeline delay
    • See Data Sheet for Additional Information

    Diagrams

    AD7942 Diagram
    Functional Block Diagram for AD7942

    Specifications

    Resolution (Bits) 14bit
    T-Put Rate 250kSPS
    # Chan 1
    Supply V Single(+2.5),Single(+3),Single(+3.3),Single(+5)
    Pwr Diss 12.5mW
    Interface Ser,SPI
    Ain Range (Vref) p-p,Uni (Vref)
    SNR (dB) 85dB
    Pkg Type CSP,SOP

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    Part# Bits Throughput Rate # of Inputs Operating Pwr Diss
    AD7942 14 250KSPS 1 12.5mW
    AD7452 12 555KSPS 1 7.25mW
    AD7980 16 1MSPS 1 10mW
    AD7450 12 1MSPS 1 1.3mW
    AD7451 12 1MSPS 1 9.25mW
    AD7687 16 250KSPS 1 12.5mW
    AD7694 16 250KSPS 1 6.3mW
    AD7983 16 1.33MSPS 1 12mW
    AD7450A 12 1MSPS 1 9mW
    AD7475 12 1MSPS 1 10.5mW
    AD7453 12 555KSPS 1 7.25mW
    Pricing, Packaging & Availability

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    Package Description
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    For detailed drawings and chemical composition please consult our  Package Site

    Pin Count
    Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

    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
    Price
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    Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.

    *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.

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