ADS7128IRTET

Analog To Digital Converters (ADC) Overview

The ADS7128IRTET is an 8-channel, multiplexed, 12-bit successive approximation register (SAR) analog-to-digital converter manufactured by Texas Instruments. It features a small 3-mm × 3-mm WQFN-16 package and supports I2C communication with up to 3.4 MHz high-speed mode. The device operates with an analog supply voltage range of 2.35 V to 5.5 V and a digital supply voltage range of 1.65 V to 5.5 V. It includes built-in cyclic redundancy check (CRC), programmable averaging filters, root-mean-square (RMS) modules, and zero-crossing detection (ZCD).

Analog To Digital Converters (ADC) Feature Summary

• Eight channels configurable as analog inputs or general-purpose digital I/O.
• Integrated digital window comparator for analog watchdog functions.
• Built-in RMS module providing 16-bit true RMS output results.
• Zero-crossing detection module with transient rejection capabilities.

Analog To Digital Converters (ADC) Applications

• Mobile robot CPU boards
• Refrigerators and freezers
• Digital multimeters (DMM)
• Rack servers

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging and temperature grade specifications. Confirm that the component matches the required pinout and electrical characteristics for the intended application design before finalizing procurement orders.

Analog To Digital Converters (ADC) Selection Notes

Select this component when an 8-channel ADC with integrated GPIO functionality is required. Ensure the system design accommodates the specified AVDD and DVDD voltage ranges. Verify that the I2C bus configuration supports the necessary address selection and clock speeds for the target application performance requirements.

Analog To Digital Converters (ADC) Part Context

This part belongs to the ADS7128 family of small, 8-channel, 12-bit SAR ADCs. It is distinguished from similar parts like the ADS7138 by its inclusion of CRC, RMS, and ZCD modules. The device is designed for applications requiring flexible channel configuration and advanced signal processing features within a compact footprint.

Analog To Digital Converters (ADC) Replacement Considerations

ADS7138IRTET: Lacks CRC, RMS, and ZCD modules.

Analog To Digital Converters (ADC) FAQ

How is the I2C address configured?

The I2C address is determined by connecting external resistors to the ADDR pin at power-up. Eight different addresses can be selected using specific resistor values between the ADDR and DECAP/GND pins.

What is the function of the DECAP pin?

The DECAP pin is used to connect a decoupling capacitor (typically 1 µF) to ground. It provides a stable internal reference voltage for the ADC conversion process.

Can the channels be used as digital outputs?

Yes, all eight channels can be independently configured as analog inputs, digital inputs, or digital outputs via the PIN_CFG and GPIO_CFG registers.