AD7783

a FEATURES 2-Channel, 24-Bit ⌺- ⌬ ADC Pin Configurable (No Programmable Registers) Pin Selectable Input Channels Pin Programmable Input Ranges (؎2.56 V or ؎160 mV) Fixed 19.79 Hz Update Rate Simultaneous 50 Hz and 60 Hz Rejection ISOURCE Select™ 24-Bit No Missing Codes 18.5-Bit p-p Resolution (؎2.56 V Range) 16.5-Bit p-p Resolution (؎160 mV Range) INTERFACE Master or Slave Mode of Operation Slave Mode 3-Wire Serial SPI™, QSPI™, MICROWIRE™, and DSP-Compatible Schmitt Trigger on SCLK POWER Specified for Single 3 V and 5 V Operation Normal: 1.3 mA@ 3 V Power-Down: 9 ␮ A www.DataSheet4U.com Read Only, Pin Configured 24-Bit ⌺-⌬ ADC AD7783 FUNCTIONAL BLOCK DIAGRAM VDD IEXC1 200␮A GND VDD REFIN(+) REFIN(–) XTAL1 XTAL2 IEXC2 200␮A IOUT1 IOUT2 IPIN OSCILLATOR AND PLL AIN(+) AIN(–) MUX BUF PGA 24-BIT ⌺-⌬ ADC SERIAL INTERFACE AND CONTROL LOGIC DOUT/RDY SCLK MODE AD7783 RANGE CS BASIC CONNECTION DIAGRAM POWER SUPPLY VDD ON-CHIP FUNCTIONS Rail-Rail Input Buffer and PGA APPLICATIONS Sensor Measurement Industrial Process Control Temperature Measurement Pressure Measurements Weigh Scales Portable Instrumentation GENERAL DESCRIPTION ANALOG INPUT CURRENT SOURCES REFERENCE INPUT AIN(+) AIN(–) IOUT1 IOUT2 AD7783 CS DOUT/RDY SCLK XTAL1 REFIN(+) REFIN(–) GND XTAL2 32.768kHz CRYSTAL DIGITAL INTERFACE The AD7783 is a complete analog front end for low-frequency measurement applications. The 24-bit sigma-delta ADC contains one fully differential input channel that can be configured w...