AD7713

LC2MOS Loop-Powered Signal Conditioning ADC AD7713 FEATURES Charge Balancing ADC 24 Bits No Missing Codes ؎0.0015% Nonlinearity 3-Channel Programmable Gain Front End Gains from 1 to 128 2 Differential Inputs 1 Single-Ended High Voltage Input Low-Pass Filter with Programmable Filter Cutoffs Ability to Read/Write Calibration Coefficients Bidirectional Microcontroller Serial Interface Single-Supply Operation Low Power (3.5 mW typ) with Power-Down Mode (150 ␮W typ) APPLICATIONS Loop Powered (Smart) Transmitters RTD Transducers Process Control Portable Industrial Instruments FUNCTIONAL BLOCK DIAGRAM REF REF AVDD DVDD IN(–) IN(+) STANDBY AVDD 1␮A AD7713 CHARGING BALANCING ADC AIN1(+) AIN1(–) AIN2(+) AIN2(–) AIN3 RTD1 PGA AUTO-ZEROED ⌺-⌬ MODULATOR DIGITAL FILTER MUX INPUT SCALING A = 1 – 128 200␮A AVDD CLOCK GENERATION SERIAL INTERFACE 200␮A CONTROL REGISTER OUTPUT REGISTER SYNC MCLK IN MCLK OUT RTD2 AGND DGND RFS TFS MODE SDATA SCLK DRDY A0 GENERA...