ADS122C04IRTET

Overview

The ADS122C04IRTET is a 24-bit, low-power analog-to-digital converter (ADC) from Texas Instruments, housed in a 16-pin WQFN package. It features a sigma-delta architecture with an integrated programmable gain amplifier (PGA) offering gains up to 128. The device supports four single-ended or two differential inputs via a flexible multiplexer and communicates through an I2C-compatible interface with speeds up to 1 Mbps. Operating on a single supply voltage ranging from 2.3 V to 5.5 V for both analog and digital domains, it delivers data rates up to 2 kSPS. The component is rated for industrial temperatures between -40°C and +125°C.

Feature Summary

• Integrated excitation current sources (iDACs) for direct sensor interfacing
• Built-in precision temperature sensor and internal voltage reference
• Digital filter with simultaneous 50 Hz and 60 Hz rejection capabilities

Applications

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

Procurement Notes

Verify the specific suffix 'IRTET' corresponds to the WQFN-16 package and tape-and-reel shipping configuration. Confirm that the I2C address pins are configured correctly for the target system bus topology. Ensure power supply decoupling meets the datasheet recommendations for optimal noise performance at 24-bit resolution.

Selection Notes

Select this model when high-resolution 24-bit conversion is required for small differential signals without external amplification. The integrated PGA and iDACs reduce bill-of-materials count compared to discrete solutions. Verify that the I2C interface speed and addressability meet the controller's communication requirements.

Part Context

This part belongs to the ADS122C04 family of precision ADCs. It shares architectural similarities with the ADS112C04 but offers higher 24-bit resolution. The 'IR' designation indicates the TSSOP or WQFN variant depending on the full suffix, while 'TET' specifies the reel packaging for automated assembly.

Replacement Considerations

The ADS122U04IRTET serves as a functional alternative within the same family, differing primarily in its UART interface instead of I2C. Designers must account for significant firmware and hardware interface changes when substituting UART-based parts for I2C-native components.