24-Bit, 156 kSPS, 112 dB Sigma-Delta ADC
with On-Chip Buffers and Serial Interface
AD7765
FEATURES APPLICATIONS
Data acquisition systems
Vibration analysis
Instrumentation GENERAL DESCRIPTION
The AD7765 is a high performance, 24-bit sigma-delta (Σ-Δ)
analog-to-digital converter (ADC). It combines wide input
bandwidth, high speed, and performance of 112 dB dynamic
range at a 156 kHz output data rate. With excellent dc
specifications, the converter is ideal for high speed data
acquisition of ac signals where dc data is also required.
Using the AD7765 eases the front-end antialias filtering
requirements, simplifying the design process significantly. The
AD7765 offers pin-selectable decimation rates of 128× and
256×. Other features include an integrated buffer to drive the
reference, as well as a fully differential amplifier to buffer and
level shift the input to the modulator.
An overrange alert pin indicates when an input signal has
exceeded the acceptable range. The addition of internal gain
and internal overrange registers makes the AD7765 a compact,
highly integrated data acquisition device requiring minimal …