AD7709ARU

The AD7709ARU is a 16-bit Sigma-Delta ADC designed for low-frequency measurement applications. It integrates a multiplexer, programmable gain amplifier (PGA), and a 16-bit Sigma-Delta modulator. The device supports 2 differential or 4 pseudo-differential inputs and features an external voltage reference. The converter achieves 16-bit no missing codes and provides simultaneous 50 Hz and 60 Hz rejection at a 20 Hz update rate. It operates from a single 2.7V to 3.3V or 5V supply, consuming only 1.25 mA typical at 3V. The digital interface is SPI, QSPI, MICROWIRE, and DSP compatible with a Schmitt trigger on SCLK. The AD7709ARU is available in a 24-TSSOP surface mount package and operates over -40°C to 85°C. Typical applications include sensor measurement, temperature measurement, pressure measurement, weigh scales, portable instrumentation, and 4-20 mA loop systems. The device also includes switchable current sources (IEXC) for RTD and VBE measurements, a 4-bit digital I/O port, and low-side power switches.