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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