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AD7763:  Serial Interface, 625 kSPS, 24-Bit Sigma-Delta A/D Converter

The AD7763 high performance, 24-bit, sigma delta analog to digital converter combines wide input bandwidth and high speed with the benefits of sigma delta conversion, as well as performance of 106dB SNR at 625 kSPS making it ideal for high speed data acquisition. A wide dynamic range combined with significantly reduced anti-aliasing requirements simplifies the design process. An integrated buffer ...More

AD7763:  Serial Interface, 625 kSPS, 24-Bit Sigma-Delta A/D Converter

Product Description

The AD7763 high performance, 24-bit, sigma delta analog to digital converter combines wide input bandwidth and high speed with the benefits of sigma delta conversion, as well as performance of 106dB SNR at 625 kSPS making it ideal for high speed data acquisition. A wide dynamic range combined with significantly reduced anti-aliasing requirements simplifies the design process. An integrated buffer to drive the reference, a differential amplifier for signal buffering and level shifting, an over-range flag, internal gain & offset registers and a low-pass digital FIR filter make the AD7763 a compact highly integrated data acquisition device requiring minimal peripheral component selection. In addition the device offers programmable decimation rates and the digital FIR filter can be adjusted if the default characteristics are not appropriate to the application. The AD7763 is ideal for applications demanding high SNR without necessitating design of complex front end signal processing.

The differential input is sampled at up to 40MS/s by an analog modulator. The modulator output is processed by a series of low-pass filters, the final one having default or user programmable coefficients. The sample rate, filter corner frequencies and output word rate are set by a combination of the external clock frequency and the configuration registers of the AD7763.

The reference voltage supplied to the AD7763 determines the analog input range. With a 4V reference, the analog input range is ±3.2V differential biased around a common mode of 2V. This common mode biasing can be achieved using the on-chip differential amplifiers, further reducing the external signal conditioning requirements.

The AD7763 is available in an exposed paddle 64-lead TQFP and 48-lead CSP packages and is specified over the industrial temperature range from -40°C to +85°C.

Applications

  • Data acquisition systems
  • Vibration analysis
  • Instrumentation

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    • 118 dB SNR at 78 kHz output data rate
    • 106 dB SNR at 625 kHz output data rate
    • 625 kHz maximum fully filtered output word rate
    • Programmable over-sampling rate (32x to 256x)
    • Flexible serial interface
    • On-chip differential amplifier for signal buffering
    • Fully differential modulator input
    • Low pass FIR filter with default or user programmable coefficients
    • Over-range alert bit
    • Digital offset and gain correction registers
    • Low power and power down modes
    • Synchronization of multiple devices via SYNC pin
    • Resolution (Bits): 24bit
    • T-Put Rate: 625kSPS
    • # Chan: 1
    • Supply V: Multi(+2.5, +5, +3.3to+5)
    • Pwr Diss: 956mW
    • Interface: I2S,Ser
    • Ain Range: 4 V p-p,6.5 V p-p
    • SNR (dB): 107dB
    • Pkg Type: QFP

    Functional Block Diagram for AD7763

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    AD7982 18 1MSPS 1 8.6mW
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    AD7401A 16 20MSPS 1 105mW
    AD7612 16 750KSPS 1 230mW
    AD7621 16 3MSPS 1 86mW
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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.

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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.