GENERAL DESCRIPTION
The AD7703 is a 20-bit ADC that uses a S-D 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