AD7762

www.DataSheet4U.com 625 kSPS, 24-Bit, 109 dB Σ−Δ ADC With On-Chip Buffer AD7762 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 FUNCTIONAL BLOCK DIAGRAM VIN– VIN+ DIFF MULTIBIT Σ-Δ MODULATOR AVDD1 AVDD2 AVDD3 VREF+ BUF RECONSTRUCTION AVDD4 DECAPA/B RBIAS AD7762 MCLK SYNC RESET CONTROL LOGIC I/O OFFSET AND GAIN REGISTERS PROGRAMMABLE DECIMATION AGND VDRIVE DVDD DGND FIR FILTER ENGINE 05477-001 CS RD/WR DRDY DB0 TO DB15 APPLICATIONS Data acquisition systems Vibration analysis Instrumentation Figure 1. GENERAL DESCRIPTION The AD7762 is a high performance, 24-bit Σ-Δ analog-todigital 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 buf...