AD7701

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 LC2MOS 16-Bit A/D Converter AD7701 FUNCTIONAL BLOCK DIAGRAM AVDD DVDD AVSS DVSS 14 15 7 6 SC1 4 SC2 17 AD7701 CALIBRATION SRAM CALIBRATION MICROCONTROLLER 13 CAL AIN 9 VREF 10 16-BIT A/D CONVERTER ANALOG MODULATOR 6-POLE GAUSSIAN LOW-PASS DIGITAL FILTER 12 BP/UP 11 SLEEP AGND 8 DGND 5 CLOCK GENERATOR SERIAL INTERFACE LOGIC 20 SDATA 19 SCLK 3 21 CLKIN CLKOUT MODE 16 CS 18 DRDY 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 modula...