ADS1281IPWR

Overview

The ADS1281IPWR is a single-channel, 24-bit resolution Sigma-Delta analog-to-digital converter (ADC) manufactured by Texas Instruments. It operates with an analog supply voltage range of 4.75 V to 5.25 V and a digital supply voltage range of 1.65 V to 3.6 V. The device supports a maximum sampling rate of 4 kS/s and features differential input types. Key performance metrics include a signal-to-noise ratio (SNR) of 130 dB, a differential nonlinearity (DNL) of +/- 1 LSB, and an integral nonlinearity (INL) of 0.0005% FSR. Power consumption is specified at 12 mW under typical operating conditions. The component is housed in a TSSOP-24 package and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates a fourth-order delta-sigma modulator with on-chip digital filters including sinc and FIR low-pass stages for high linearity and noise suppression.
• Includes programmable gain amplifier (PGA) with selectable gain settings and an internal precision reference to simplify system design.
• Features built-in sensor excitation current sources to facilitate direct connection to resistive bridge sensors without external circuitry.

Applications

• Seismic data acquisition systems requiring high dynamic range and precise signal capture.
• Well logging equipment for energy exploration environments.
• High-precision industrial weighing scales utilizing resistive bridge sensors.

Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm package type and temperature grade. Ensure compatibility with SPI interface requirements and power supply voltages during integration. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity and current production status before procurement.

Selection Notes

Select this component when a single-channel, high-resolution ADC with integrated PGA and reference is required. Consider the TSSOP-24 package constraints for PCB layout. Evaluate the 4 kS/s sampling limit against application bandwidth needs. Verify that the 130 dB SNR meets the system's noise floor requirements for differential inputs.

Part Context

The ADS1281 belongs to the ADS128x family of high-performance ADCs designed for demanding measurement applications. It shares architectural similarities with the ADS1282 but differs in channel count and pin configuration. The IPWR suffix indicates a tape-and-reel packaging format suitable for automated surface-mount assembly processes.

Replacement Considerations

The ADS1281IPWG4 is a verified equivalent variant within the same product family, offering identical electrical specifications and functionality. Other members of the ADS128x series may serve as alternatives if channel count or pinout differences are acceptable.