ADS1281IPWG4

Overview

The ADS1281IPWG4 is a high-resolution, single-channel analog-to-digital converter (ADC) manufactured by Texas Instruments. It utilizes a fourth-order delta-sigma modulation architecture to achieve a resolution of 31 bits and a maximum sampling rate of 4 kS/s. The device features differential input types and communicates via an SPI interface. It operates with an analog supply voltage ranging from 4.75 V to 5.25 V and a digital supply voltage between 1.65 V and 3.6 V. Key performance metrics include a signal-to-noise ratio of 130 dB, differential nonlinearity of +/- 1 LSB, and integral nonlinearity of 0.0005% FSR. Power consumption is specified at 12 mW, with a maximum power dissipation of 18 mW. 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, FIR low-pass, and IIR high-pass stages for superior noise and linear performance.
• Supports system calibration through internal gain and offset scaling registers, alongside synchronous inputs for external clock alignment.
• Provides flexible data rates with selectable decimation options ranging from 250 SPS to 4000 SPS.

Applications

• Energy exploration systems requiring high-density circuit board designs.
• Seismic monitoring environments demanding precise signal acquisition.
• High-performance industrial measurement applications utilizing sigma-delta conversion.

Procurement Notes

Verify the specific suffix G4 indicates RoHS compliance and lead-free manufacturing status as per Texas Instruments standards. Confirm the TSSOP-24 package dimensions match your PCB footprint requirements. Ensure the external reference voltage source aligns with the device's input specifications. Validate that the SPI interface timing meets the controller's capabilities. Check for any specific handling instructions regarding moisture sensitivity levels during storage and assembly.

Selection Notes

Select this component when a single-channel, high-resolution ADC is required for precision measurements. The 31-bit effective resolution and 130 dB SNR make it suitable for low-level signal detection. Consider the 12 mW power consumption for energy-constrained designs. The integrated digital filters reduce the need for external processing. Ensure the application environment stays within the -40°C to +85°C operating temperature range.

Part Context

The ADS1281IPWG4 belongs to the ADS1281 series of delta-sigma ADCs from Texas Instruments. This series is designed for applications requiring high accuracy and low noise. The IPWG4 designation specifies the industrial temperature grade, tube packaging, and RoHS-compliant construction. It serves as a specialized solution for demanding measurement tasks where standard ADCs lack sufficient resolution or dynamic range.

Replacement Considerations

The ADS1281IPW is a direct pin-compatible alternative within the same family. Verify if the specific suffix variations impact electrical characteristics or packaging. No other public substitute part numbers are confirmed for this specific model.