109 dB Sigma-Delta ADC
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625 kSPS, 24-Bit, 109 dB Σ−Δ ADC With On-Chip Buffer AD7762
FEATURES
120 dB dynamic range at 78 kHz...
Description
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...
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