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 (max) 12.5mW
    Interface Ser,SPI
    Ain Range (Vref) p-p,Uni (Vref)
    SNR (dB) 85dB
    Pkg Type CSP,SOP

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