ADS7128IRTER

The ADS7128 is an easy-to-use 8-channel multiplexed 12-bit successive approximation register analog-to-digital converter (SAR ADC). The 8 channels can be independently configured as analog inputs, digital inputs, or digital outputs. The device features an internal oscillator for performing the ADC conversion process. The ADS7128 communicates via an I²C-compatible interface and can operate in autonomous or single-shot conversion modes. The ADS7128 implements analog monitoring functions through per-channel event-triggered interrupts using a digital window comparator with programmable high and low thresholds, hysteresis, and an event counter. The ADS7128 has a built-in cyclic redundancy check (CRC) function for data read/write operations and power-on configuration. The ADS7128 features a root mean square (RMS) module that can calculate 16-bit true RMS results for any analog input channel. The integrated zero-crossing detection (ZCD) module can trigger transient suppression and hysteresis when approaching the configurable threshold.

Applications

• Monitoring functions
• Portable instruments
• Appliances
• Telecom infrastructure
• Power monitoring

Key features

• Compact package: 3mm × 3mm WQFN
• 8-channel, configurable as any combination of: up to 8 analog inputs, digital inputs, or digital outputs
• GPIO for I/O expansion: open-drain, push-pull digital outputs
• Analog monitoring: programmable threshold per channel with event counter for transient suppression
• Wide operating range: AVDD: 2.35V to 5.5V; DVDD: 1.65V to 5.5V; temperature range: -40°C to +85°C
• CRC for read/write operations: data read/write CRC; power-on configuration CRC
• I²C interface: up to 3.4MHz (high-speed); 8 configurable I²C addresses
• Programmable averaging filter
• RMS module: 16-bit true RMS output; programmable RMS time window
• Zero-crossing detection module: ZCD output for any analog input; built-in transient suppression and hysteresis
• Digitally adjustable detection threshold