ADS1291IRSMT

Analog Front End (AFE) Overview

The ADS1291IRSMT is a single-channel, low-power analog front end (AFE) designed for biopotential measurements. It integrates a 24-bit sigma-delta ADC with a programmable gain amplifier (PGA), internal reference, and on-chip oscillator. The device operates on an analog supply voltage ranging from 2.7 V to 5.25 V and a digital supply voltage from 1.7 V to 3.6 V. It supports data rates up to 8 kSPS and features a serial SPI interface. The component is housed in a 32-pin VQFN package (4 mm x 4 mm) and is rated for operation between -40°C and +85°C.

Analog Front End (AFE) Feature Summary

• Integrates a 24-bit sigma-delta ADC with a single channel and 8 kSPS sampling rate
• Includes built-in PGA, internal reference, and on-chip oscillator for system simplification
• Operates with analog supply of 2.7 V to 5.25 V and digital supply of 1.7 V to 3.6 V
• Features serial SPI interface and 32-VQFN (4x4 mm) surface-mount packaging

Analog Front End (AFE) Applications

• Portable electrocardiogram (ECG) systems
• Wearable health monitoring devices
• Medical instrumentation requiring low power consumption

Analog Front End (AFE) Procurement Notes

Verify the specific suffix 'IRSMT' corresponds to the tape-and-reel packaging variant when ordering. Confirm that the required analog and digital supply voltages align with the specified ranges of 2.7–5.25 V and 1.7–3.6 V respectively. Ensure design compatibility with the 32-VQFN footprint and thermal requirements for the -40°C to +85°C operating range.

Analog Front End (AFE) Selection Notes

Select this component for applications requiring a single-channel biopotential acquisition path with high resolution. Compare power dissipation specifications against system constraints, as the device consumes approximately 495 µW. Consider the integrated PGA and reference capabilities to reduce external component count compared to discrete ADC solutions.

Analog Front End (AFE) Part Context

This part belongs to the Texas Instruments ADS129x family of analog front ends specifically engineered for biopotential signals. It shares architectural similarities with multi-channel variants like the ADS1292R but provides a simplified single-channel configuration. The series is optimized for portable medical devices where size, power, and signal integrity are critical design parameters.

Analog Front End (AFE) Replacement Considerations

The ADS1291IPBS serves as a pin-compatible alternative offering the same electrical specifications but utilizes a TQFP-32 package instead of the VQFN form factor.