ADS122C04IRTER

Overview

The ADS122C04IRTER is a 24-bit, low-power analog-to-digital converter (ADC) from Texas Instruments, featuring four channels and a Sigma-Delta architecture. It supports differential or single-ended inputs with an integrated programmable gain amplifier (PGA) offering gains up to 128. The device utilizes an I2C interface for communication and operates on supply voltages ranging from 2.3 V to 5.5 V for both analog and digital domains. It achieves sampling rates up to 2 kSPS and includes features such as internal excitation current sources, a temperature sensor, and 50/60 Hz line frequency rejection. The component is housed in a WQFN-16 package and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Integrates a flexible input multiplexer supporting two differential or four single-ended channels with an internal low-noise PGA.
• Includes built-in excitation current sources (iDACs), a voltage reference, and a precision temperature sensor to reduce external component count.
• Features a 2-wire I2C compatible interface supporting bus speeds up to 1 Mbps with configurable addressing.

Applications

• Resistance Temperature Detector (RTD) measurement systems
• Thermocouple signal conditioning
• Strain gauge and resistive bridge sensor interfaces

Procurement Notes

Verify the specific suffix 'IRTER' corresponds to the WQFN-16 package and tape-and-reel packaging configuration. Confirm RoHS compliance status and moisture sensitivity level requirements during storage and handling. Ensure the I2C address pins are configured correctly for the target system topology to avoid bus conflicts.

Selection Notes

Select this model when a 24-bit resolution and high channel count are required in a compact form factor. The integrated iDACs make it suitable for exciting bridge sensors without external circuitry. Consider the I2C interface constraint if higher data throughput or multi-master support is needed, as alternatives like the ADS122U04 offer UART connectivity.

Part Context

This part belongs to the ADS122C04 family of precision ADCs designed for small-sensor signal measurements. It shares architectural similarities with other members like the ADS112C04 but offers higher 24-bit resolution compared to the 16-bit ADS112 series. The IRTER suffix specifically denotes the reel-packaged version of the WQFN-16 footprint variant.

Replacement Considerations

The ADS122C04IPWR serves as a pin-compatible alternative in a TSSOP-16 package. For UART interface requirements, the ADS122U04IRTER provides similar performance with different communication protocols. Verify that any substitute maintains the same 2.3V to 5.5V operating voltage range and thermal specifications.