ADS1217

ADS1217ADS1217 SBAS260C – MAY 2002 – REVISED FEBRUARY 2007 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER FEATURES q 24 BITS NO MISSING CODES q INL: 0.0012% of FSR (max) q FULL-SCALE INPUT: ±2VREF q PGA FROM 1 TO 128 q 22 BITS EFFECTIVE RESOLUTION (PGA = 1), 19 BITS (PGA = 128) q SINGLE CYCLE SETTLING MODE q PROGRAMMABLE DATA OUTPUT RATES UP TO 1kHz q ON-CHIP 1.25V/2.5V REFERENCE q ON-CHIP CALIBRATION q SPI COMPATIBLE q POWER SUPPLY: 2.7V to 5.25V q < 1mW POWER CONSUMPTION, VDD = 3V APPLICATIONS q INDUSTRIAL PROCESS CONTROL q LIQUID/GAS CHROMATOGRAPHY q BLOOD ANALYSIS q SMART TRANSMITTERS q PORTABLE INSTRUMENTATION q WEIGH SCALES q PRESSURE TRANSDUCERS IDAC2 IDAC1 DESCRIPTION The ADS1217 is a precision, wide dynamic range, deltasigma, Analog-to-Digital (A/D) converter with 24-bit resolution operating from 2.7V to 5.25V supplies. The delta-sigma, A/D converter provides up to 24 bits of no missing code performance and effective resolution of 22 bits. The eight input channels are multiplexed. Internal buffering can be selected to provide a very high input impedance for direct connection to transducers or low-level voltage signals. Burnout current sources are provided that allow for the detection of an open or shorted sensor. An 8-bit Digital-toAnalog Converter (DAC) provides an offset correction with a range of 50% of the FSR (Full-Scale Range). The PGA (Programmable Gain Amplifier) provides selectable gains of 1 to 128 with an effective resolution of 19 bits at a gain of 12...