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 FUNCTIONAL BLOCK DIAGRAM DVDD 15 AVDD 14 AVSS 7 DVSS 6 SC1 4 SC2 17 AD7703 CALIBRATION SRAM CALIBRATION MICROCONTROLLER 13 CAL AIN 9 VREF 10 AGND 8 DGND 5 20-BIT CHARGE BALANCE A/D CONVERTER ANALOG MODULATOR 6-POLE GAUSSIAN LOW-PASS DIGITAL FILTER 12 BP/UP 11 SLEEP CLOCK GENERATOR SERIAL INTERFACE LOGIC 20 SDATA 19 SCLK 3 2 1 16 CLKIN CLKOUT MODE CS 18 DRDY GENERAL DESCRIPTION
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. The inherent linearity of the ADC is excellent and endpoint accuracy is ensured by self-calibration of zero and full scale, which may be initiated at any time.
Analog Devices
