GENERAL DESCRIPTION

The AD7762 is a high performance, 24-bit Σ-Δ analog-to digital converter (ADC). It combines wide input bandwidth and high speed with the benefits of Σ-Δ conversion with a performance of 106 dB SNR at 625 kSPS, making it ideal for high speed data acquisition. Wide dynamic range combined with significantly reduced antialiasing requirements simplify the design process. An integrated buffer to drive the reference, a differential amplifier for signal buffering and level shifting, an overrange flag, internal gain and offset registers, and a low-pass digital FIR filter make the AD7762 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 AD7762 is ideal for applications demanding high SNR without a complex front end signal processing design.

FEATURES

  120 dB dynamic range at 78 kHz output data rate

  109 dB dynamic range at 625 kHz output data rate

  112 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 (32× to 256×)

  Fully differential modulator input

  On-chip differential amplifier for signal buffering

  Low-pass finite impulse response (FIR) filter with default or user-programmable coefficients

  Overrange alert bit

  Digital offset and gain correction registers

  Filter bypass modes

  Low power and power-down modes

  Synchronization of multiple devices via SYNC pin

APPLICATIONS

  Data acquisition systems

  Vibration analysis

  Instrumentation