ADS1242IPWR

Overview

The ADS1242IPWR is a 24-bit analog-to-digital converter (ADC) manufactured by Texas Instruments, housed in a 16-pin TSSOP package. It features a sigma-delta architecture with four differential or single-ended input channels and an integrated programmable gain amplifier (PGA). The device operates on a supply voltage range of 2.7 V to 5.25 V for both analog and digital domains. It supports a maximum data rate of 15 SPS and communicates via a standard SPI interface. Key performance metrics include a differential nonlinearity (DNL) of ±1 LSB and integral nonlinearity (INL) of ±0.0015% FSR. Power consumption is specified at 600 µW, with a maximum power dissipation of 1.9 mW. The component functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrated programmable gain amplifier (PGA) supporting gains from 1 to 128 for signal conditioning.
• Built-in 50 Hz and 60 Hz rejection filters to suppress power line interference.
• General-purpose input/output (GPIO) pins available for system control and status monitoring.
• External reference voltage input capability allowing flexibility in reference selection.

Applications

• Industrial process control systems requiring high-precision sensor interfacing.
• Weigh scales and load cell measurement applications utilizing bridge sensors.
• Medical equipment such as electrocardiogram (ECG) devices needing low-noise signal acquisition.
• Portable instrumentation benefiting from low-power operation and small form factor.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm package type and tape-and-reel specifications. Ensure compatibility with external reference voltages and clock sources before integration. Confirm RoHS compliance status and moisture sensitivity level requirements for your assembly process. Cross-reference the part number with official distributors to validate authenticity and avoid counterfeit components.

Selection Notes

Select this component when high resolution and low speed are prioritized over throughput. The ADS1242IPWR is suitable for applications where noise rejection and accuracy are critical. Consider the ADS1243IPWR if additional internal excitation current sources are required for bridge sensors. Evaluate power budget constraints as the device offers low standby and active mode currents compared to higher-speed alternatives.

Part Context

The ADS1242IPWR belongs to the ADS124x family of precision analog-to-digital converters from Texas Instruments. This series is designed for applications demanding high accuracy and low noise. The IPWR suffix indicates a 16-pin Thin-Shrink Small-Outline Package (TSSOP) with a plastic leaded frame. It shares architectural similarities with other members like the ADS1243 and ADS1244, differing primarily in feature sets such as internal references or current sources.

Replacement Considerations

The ADS1242IPWRG4 is a lead-free variant of the same functional device. For pin-compatible upgrades with added features, consider the ADS1243IPWR which includes internal excitation current sources. Higher-speed alternatives in the family include the ADS1246IPWR and ADS1247IPWR, though these require different pinouts and have distinct electrical characteristics.