AD7738

a FEATURES High Resolution ADC 24 Bits No Missing Codes ؎0.0015% Nonlinearity Optimized for Fast Channel Switching 18-Bits p-p Resolution (21 Bits Effective) at 500 Hz 16-Bits p-p Resolution (19 Bits Effective) at 8.5 kHz 15-Bits p-p Resolution (18 Bits Effective) at 15 kHz On-Chip Per Channel System Calibration Configurable Inputs 8 Single-Ended or 4 Fully Differential Input Ranges +625 mV, +1.25 V, +2.5 V, ؎625 mV, ؎1.25 V, ؎2.5 V 3-Wire Serial Interface SPI™, QSPI™, MICROWIRE™ and DSP Compatible Schmitt Trigger on Logic Inputs Single-Supply Operation 5 V Analog Supply 3 V or 5 V Digital Supply Package: 28-Lead TSSOP APPLICATIONS PLCs/DCS Multiplexing Applications Process Control Industrial Instrumentation 8-Channel, High Throughput, 24-Bit ⌺-⌬ ADC AD7738 FUNCTIONAL BLOCK DIAGRAM MUXOUT ADCIN REFIN– REFIN+ REFERENCE DETECT AIN0 AIN1 AIN2 AIN3 MUX AIN4 AIN5 AIN6 AIN7 CALIBRATION CIRCUITRY BUFFER 24-BIT ⌺-⌬ ADC AD7738 SCLK SERIAL INTERFACE DOUT DIN CS AINCOM/P0 I/O PORT SYNC/P1 CLOCK GENERATOR CONTROL LOGIC RDY RESET AGND AVDD MCLKOUT MCLKIN DGND DVDD GENERAL DESCRIPTION The AD7738 is a high precision, high throughput analog front end. True 16-bit p-p resolution is achievable with a total conversion time of 117 µs (8.5 kHz channel switching), making it ideally suitable for high resolution multiplexing applications. The part can be configured via a simple digital interface, which allows users to balance the noise performance against data throughput up to a 15....