ADS1224

ADS1224 SBAS286A − JUNE 2003 − REVISED MARCH 2004 24ĆBit AnalogĆtoĆDigital Converter with 4ĆChannel Differential Input Multiplexer FEATURES D 240SPS Data Rate with 4MHz Clock D 20-Bit Effective Resolution D Input Multiplexer with Four Differential D D D D D D D D D D Channels Pin-Selectable, High-Impedance Input Buffer ±5V Differential Input Range 0.0003% INL (typ), 0.0015% INL (max) Self-Calibrating Simple 2-Wire Serial Interface On-Chip Temperature Sensor Single Conversions with Standby Mode Low Current Consumption: 300µA Analog Supply: 2.7V to 5.5V Digital Supply: 2.7V to 5.5V DESCRIPTION The ADS1224 is a 4-channel, 24-bit, delta-sigma analog-to-digital (A/D) converter. It offers excellent performance and low power in a TSSOP-20 package. The ADS1224 is well-suited for demanding, high-resolution measurements, especially in portable systems and other space-saving and power-constrained applications. A delta-sigma 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 four 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 single conversions are needed, the ADS1224 can be quickly shut down (Standby mode) while idle between m...