ADS1222

www.ti.com ADS1222 SBAS314B − APRIL 2004 − REVISED JANUARY 2009 24ĆBit AnalogĆtoĆDigital Converter with 2ĆChannel Differential Input Multiplexer FEATURES D 240SPS Data Rate with 4MHz Clock D 20-Bit Effective Resolution D Input Multiplexer with Two Differential Channels D Pin-Selectable, High-Impedance Input Buffer D ±5V Differential Input Range D 0.0003% INL (typ), 0.0015% INL (max) D Self-Calibrating D Simple 2-Wire Serial Interface D On-Chip Temperature Sensor D Single Conversions with Standby Mode D Low Current Consumption: 300µA D Analog Supply: 2.7V to 5.5V APPLICATIONS D Hand-Held Instrumentation D Portable Medical Equipment D Industrial Process Control D Weigh Scales DESCRIPTION The ADS1222 is a 2-channel, 24-bit, delta-sigma analog-to-digital (A/D) converter. It offers excellent performance and low power in a TSSOP-14 package. The ADS1222 is well-suited for demanding, high-resolution measurements, especially in portable systems and other space-saving and power-constrained applications. A delta-sigma (∆Σ) modulator and digital filter form the basis of the A/D converter. The analog modulator has a ±5V differential input range. An input multiplexer (MUX) is used to select between two separate differential input channels. A buffer can be selected to increase the input impedance of the measurement. A simple, 2-wire serial interface provides all the necessary control. Data retrieval, self-calibration, and Standby mode are handled with a few simple waveforms. When only si...