Mouser now stocks the ADS7028 and ADS7138 12-bit ADCs from Texas Instruments. The eight-channel, multiplexed, SAR ADCs offer reliable performance for applications including rack servers, AC drive power stage modules, automotive centre information displays, and mobile robot CPU boards.
The ADC features eight channels that can be configured in any combination of analog inputs, digital inputs, or digital outputs. The devices provide an internal oscillator for ADC processes, as well as a built-in cyclical redundancy check for power-up configuration and data read/write operations. Both ADCs provide open-drain, push-pull digital outputs for I/O expansion, while the devices’ analog watchdog function incorporates an event counter for transient rejection and programmable thresholds for each channel. The ADCs offer wide operating ranges of 2.35V to 5.5V AVDD and 1.65V to 5.5V DVDD.
The ADS7028 communicates through an SPI-compatible interface with a sampling frequency of 1MSPS, while the ADS7138 communicates using an I2C-compatible interface able to operate at a frequency of up to 3.4MHz. Both ADCs run in either autonomous or single-shot conversion mode. The ADS7028 ADC also provides a root-mean-square module that computes a 16-bit true RMS output for any analog input, as well as a zero-crossing-detect module that offers built-in transient rejection and hysteresis near configurable threshold crossings.