ADS1222IPWRG4

Overview

The ADS1222IPWRG4 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. 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 1.35 mW of power. It utilizes a serial interface compatible with SPI and I2C protocols. Key performance metrics include a maximum integral nonlinearity of 0.0015% FSR and a typical INL of 0.0003%. The component is housed in a 14-pin TSSOP package and is rated for operation within a temperature range of -40°C to +85°C.

Feature Summary

• Integrated 2-channel differential input multiplexer with pin-selectable high-impedance input buffer
• On-chip temperature sensor for internal monitoring capabilities
• Self-calibrating architecture to maintain accuracy without external calibration components
• Supports simple 2-wire serial interface communication

Applications

• Battery-powered instrumentation systems requiring low power consumption
• Industrial process control loops utilizing thermocouple or RTD sensors
• Portable medical devices such as pulse oximeters or blood pressure monitors
• High-resolution weighing scales and load cell interfaces

Procurement Notes

Verify the G4 suffix indicates lead-free compliance and RoHS standards when sourcing. Confirm the specific tape and reel quantity requirements for automated assembly lines. Ensure the ordering information matches the exact IPWR package variant to guarantee physical compatibility with existing PCB footprints. Cross-reference the manufacturer's latest datasheet revision to confirm any updates to electrical characteristics or recommended operating conditions prior to final procurement.

Selection Notes

Select this component when designing circuits that require high resolution with minimal channel count. The 24-bit resolution is suitable for precision measurements where noise rejection is critical. Consider the 240 SPS maximum data rate against system bandwidth requirements. The external reference requirement must be accounted for in the design phase to achieve specified linearity performance. Evaluate the TSSOP-14 package constraints regarding thermal dissipation and board space availability.

Part Context

This part belongs to the ADS122x family of low-power, 24-bit ADCs from Texas Instruments. It shares architectural similarities with the ADS1220 and ADS1221 but distinguishes itself through its specific channel configuration and interface options. The IPWRG4 designation identifies the specific surface-mount package and environmental compliance status within the broader product line.

Replacement Considerations

The ADS1222IPWT is a documented parameter-equivalent alternative within the same series. Verify pinout compatibility and electrical specifications before substitution. Other members of the ADS122x family may offer different channel counts or data rates.