Low-power delta-sigma ADC’s integrated features reduce system cost and component count

Texas Instruments ADS122U04 is a precision, 24-bit, ADC offering many integrated features to reduce system cost and component count in applications measuring small sensor signals. The device features two differential or four single-ended inputs through a flexible input MUX, a low-noise, PGA, two programmable excitation current sources, a voltage reference, an oscillator, and a precision temperature sensor. The device can perform conversions at data rates up to 2000 SPS with single-cycle settling. At 20 SPS, the digital filter offers simultaneous 50Hz and 60Hz rejection for noisy industrial applications. The internal PGA offers gains up to 128. This PGA makes the device ideally suited for applications measuring small sensor signals, such as RTDs, thermocouples, thermistors, and resistive bridge sensors. The device features a two-wire, UART-compatible interface. In applications that require galvanic isolation this UART interface minimizes the number of digital isolation channels, thus saving cost, board space, and power. The device is offered in a leadless 16-pin WQFN or a 16-pin TSSOP package and is specified over a temperature range of –40C to +125C.