GENERAL DESCRIPTION

The AD7731 is a complete analog front-end for process control applications. The device has a proprietary programmable gain front end that allows it to accept a range of input signal ranges, including low level signals, directly from a transducer. The sigmadelta architecture of the part consists of an analog modulator and a low pass programmable digital filter, allowing adjustment of filter cutoff, output rate and settling time.

FEATURES

24-Bit Sigma-Delta ADC

16 Bits p-p Resolution at 800 Hz Output Rate

Programmable Output Rates up to 6.4 kHz

Programmable Gain Front End

±0.0015 Nonlinearity

Buffered Differential Inputs

Programmable Filter Cutoffs

FASTStep™* Mode for Channel Sequencing

Single Supply Operation

APPLICATIONS

Process Control

PLCs/DCS

Industrial Instrumentation