GENERAL DESCRIPTION

The AD7701 is a 16-bit ADC that uses a sigma-delta conversion technique. The analog input is continuously sampled by an analog modulator whose mean output duty cycle is proportional to the input signal. The modulator output is processed by an on-chip digital filter with a six-pole Gaussian response, which updates the output data register with 16-bit binary words at word rates up to 4 kHz. The sampling rate, filter corner frequency, and output word rate are set by a master clock input that may be supplied externally, or by a crystal controlled on-chip clock oscillator.

FEATURES

Monolithic 16-Bit ADC

0.0015 Linearity Error

On-Chip Self-Calibration Circuitry

Programmable Low-Pass Filter

0.1 Hz to 10 Hz Corner Frequency

0 V to +2.5 V or ±2.5 V Analog Input Range

4 kSPS Output Data Rate

Flexible Serial Interface

Ultralow Power

APPLICATIONS

Industrial Process Control

Weigh Scales

Portable Instrumentation

Remote Data Acquisition