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Texas Instruments ADS7028 12-Bit Analog-to-Digital Converter

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

Features

  • Small package size
    • WQFN 3mm × 3mm
  • 8-channels configurable as any combination of
    • Up to 8 analog inputs, digital inputs, or digital outputs
  • GPIOs for I/O expansion
    • Open-drain, push-pull digital outputs
  • Analog watchdog
    • Programmable thresholds per channel
    • Event counter for transient rejection
  • Wide operating ranges
    • 2.35V to 5.5V AVDD 
    • 1.65V to 5.5V DVDD 
    • –40°C to +85°C temperature range
  • Enhanced-SPI digital interface
    • High-speed, 60MHz interface
    • Achieve full throughput with > 13.5MHz SPI
  • CRC for read/write operation
    • CRC on data read/write
    • CRC on power-up configuration
  • Programmable averaging filters
  • Root-mean-square module
    • 16-bit true RMS output
    • Programmable RMS time window
  • Zero-crossing-detect module
    • ZCD output corresponding to analog input
    • Built-in transient rejection and hysteresis
    • Digitally adjustable detection threshold

Applications

  • Refrigerator and freezer
  • Rack server
  • Mixed module (AI, AO, DI, DO)
  • AC drive power stage module

Functional Block Diagram

Block Diagram - Texas Instruments ADS7028 12-Bit Analog-to-Digital Converter
Published: 2020-07-01 | Updated: 2024-06-26