Small 8-channel 12-bit analog-to-digital converter (ADC) with SPI, GPIOs and CRC

The ADS7028 is an easy-to-use, 8-channel, multiplexed, 12-bit, 1-MSPS, successive approximation register analog-to-digital converter (SAR ADC). The eight channels can be independently configured as either analog inputs, digital inputs, or digital outputs. The device has an internal oscillator for the ADC conversion process.

The ADS7028 communicates through an SPI-compatible interface and operates in either autonomous or single-shot conversion mode. The ADS7028 implements the analog watchdog function by event-triggered interrupts per channel using a digital window comparator with programmable high and low thresholds, hysteresis, and an event counter. The ADS7028 has a built-in cyclic redundancy check (CRC) for data read/write operations and the power-up configuration. The ADS7028 features a root-mean-square (RMS) module that computes a 16-bit true RMS result for any analog input channel. The integrated zero-crossing-detect (ZCD) module allows for transient rejection and hysteresis near the configurable threshold crossings.