AD7716

a FEATURES 22-Bit Sigma-Delta ADC Dynamic Range of 105 dB (146 Hz Input) ؎0.003% Integral Nonlinearity On-Chip Low-Pass Digital Filter Cutoff Programmable from 584 Hz to 36.5 Hz Linear Phase Response Five Line Serial I/O Twos Complement Coding Easy Interface to DSPs and Microcomputers Software Control of Filter Cutoff ؎5 V Supply Low Power Operation: 50 mW APPLICATIONS Biomedical Data Acquisition ECG Machines EEG Machines Process Control High Accuracy Instrumentation Seismic Systems LC2MOS 22-Bit Data Acquisition System AD7716 FUNCTIONAL BLOCK DIAGRAM AVDD DVDD AVSS RESET A0 A1 A2 CLKIN CLKOUT AIN 1 AD7716 ANALOG MODULATOR LOW PASS DIGITAL FILTER AIN 2 ANALOG MODULATOR LOW PASS DIGITAL FILTER AIN 3 ANALOG MODULATOR LOW PASS DIGITAL FILTER AIN 4 ANALOG MODULATOR LOW PASS DIGITAL FILTER CLOCK GENERATION CONTROL LOGIC OUTPUT SHIFT REGISTER CONTROL REGISTER MODE CASCIN CASCOUT RFS SDATA SCLK DRDY TFS VREF AGND DGND DIN 1 DOUT1 DOUT2 GENERAL DESCRIPTION The AD7716 is ...