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AD7946:  14-Bit, 500 kSPS PulSAR® ADC in MSOP

The AD7946 is a 14-bit, 500 kSPS, charge redistribution successive-approximation Analog-to-Digital Converter which operates from a single 5V power supply, VDD. It contains a very low power high-speed 16-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, very short aperture delay track/hold ...More

AD7946:  14-Bit, 500 kSPS PulSAR® ADC in MSOP

Product Description

The AD7946 is a 14-bit, 500 kSPS, charge redistribution successive-approximation Analog-to-Digital Converter which operates from a single 5V power supply, VDD. It contains a very low power high-speed 16-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, very short aperture delay track/hold circuit. On the CNV rising edge, it samples an analog input IN+ between 0 V to REF with respect to a ground sense IN-. The reference voltage REF is applied externally and can be set up to the supply voltage.

Its power scales linearly with 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 the separate supply VIO.

The AD7946 is housed in a 10-lead µSOIC or 10-lead QFN (LFCSP) with operation specified from –40°C to +85°C.

Applications

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

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    • 14-bit resolution with no missing codes
    • Throughput: 500 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 REF with REF up to VDD
    • No pipeline delay
    • Single-supply 5 V operation with
      1.8 V/2.5 V/3 V/5 V logic interface
    • 1.8 V/2.5 V/3 V/5 V logic interface
    • Serial interface, SPI/QSPI/MICROWIRE™/DSP compatible
    • Daisy-chain multiple ADCs and BUSY indicator
    • Power dissipation 3.3 mW @ 5 V/100 kSPS 3.3 μW @ 5 V/100 SPS
    • Resolution (Bits): 14bit
    • T-Put Rate: 500kSPS
    • # Chan: 1
    • Supply V: Single(+5)
    • Pwr Diss: 19mW
    • Interface: Ser,SPI
    • Ain Range: (Vref) p-p
    • SNR (dB): 85dB
    • Pkg Type: CSP,SOP

    Functional Block Diagram for AD7946

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    AD7492-5 12 1.25MSPS 1 16.5mW
    AD7495 12 1MSPS 1 13mW
    AD7472 12 1.5MSPS 1 12mW
    AD7476A 12 1MSPS 1 17.5mW
    AD7476 12 1MSPS 1 17.5mW
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    AD7453 12 555KSPS 1 7.25mW
    AD7475 12 1MSPS 1 10.5mW
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    Pricing, Packaging & Availability

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    • 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.