ADS1222IPWR

Overview

The ADS1222IPWR is a 24-bit delta-sigma analog-to-digital converter (ADC) manufactured by Texas Instruments. It features two differential input channels with an integrated multiplexer and supports data rates up to 240 samples per second using a 4 MHz clock. The device operates on a single supply voltage ranging from 2.7 V to 5.5 V for both analog and digital domains, consuming approximately 300 µA of analog supply current. It utilizes a simple two-wire serial interface compatible with I2C and SPI protocols. Key performance metrics include a maximum integral nonlinearity (INL) of 0.0015% FSR and a differential input range of ±5 V when utilizing the pin-selectable high-impedance input buffer.

Feature Summary

• Integrated input multiplexer supporting two differential channels with pin-selectable high-impedance buffering
• On-chip temperature sensor and self-calibrating functionality for enhanced measurement accuracy
• Supports 50 Hz and 60 Hz line frequency rejection capabilities
• Operates in single conversion mode with standby capability to minimize power consumption

Applications

• Precision industrial process control systems requiring high-resolution signal acquisition
• Portable battery-powered instrumentation due to low current consumption
• Weigh scales and resistive bridge sensor interfaces
• Medical equipment and patient monitoring devices

Procurement Notes

Verify the specific suffix 'IPWR' corresponds to the TSSOP-14 package and commercial temperature range (-40°C to +85°C). Confirm RoHS compliance and lead-free status as indicated in official datasheets. Ensure the ordering part number matches the required interface configuration and packaging format before finalizing procurement orders.

Selection Notes

Select this component when a 24-bit resolution is required for low-frequency signals with minimal external calibration. Consider the internal reference limitations if higher precision is needed, as the device typically requires an external reference. Evaluate the trade-off between the 240 SPS maximum data rate and system bandwidth requirements compared to faster ADC alternatives.

Part Context

The ADS1222 belongs to the ADS122x family of low-power, 24-bit delta-sigma ADCs from Texas Instruments. This series is designed for applications demanding high accuracy in small form factors. The IPWR variant specifically denotes the plastic TSSOP surface-mount package, distinguishing it from other package options within the same functional family.

Replacement Considerations

Check for ADS1220 or ADS1221 variants if channel count or data rate differences are acceptable. Verify pin compatibility and register mapping when substituting with other members of the ADS122x family to ensure seamless integration without hardware redesign.