ADS1291IPBSR

Analog Front End (AFE) Overview

The ADS1291IPBSR 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 of 2.7 V to 5.25 V and a digital supply of 1.7 V to 3.6 V. It supports data rates up to 8 kS/s via a serial SPI interface. Power consumption is specified at 350 µW, with a maximum power dissipation of 495 µW. The component is housed in a 32-pin TQFP package and functions within a temperature range of -40°C to +85°C.

Analog Front End (AFE) Feature Summary

• Integrated 24-bit resolution with 8 kS/s sampling rate
• Low power consumption of 350 µW per channel
• Built-in PGA, internal reference, and oscillator
• Supports lead-off detection and right-leg drive generation

Analog Front End (AFE) Applications

• Portable electrocardiogram (ECG) systems
• Holter monitors
• Ambulatory monitoring devices

Analog Front End (AFE) Procurement Notes

Verify the suffix 'R' indicates tape-and-reel packaging distinct from the tray-packaged IPBS variant. Confirm the specific revision level matches design requirements, as Texas Instruments may issue engineering change notices affecting pinout or electrical characteristics over time. Ensure compatibility with the intended PCB footprint for the 32-TQFP package.

Analog Front End (AFE) Selection Notes

Select this model for applications requiring a single-channel biopotential acquisition path with minimal external components. The integrated PGA eliminates the need for discrete amplifiers, reducing board space. Verify that the required input signal range aligns with the internal reference voltage capabilities and that the SPI interface timing meets the host microcontroller specifications.

Analog Front End (AFE) Part Context

This part belongs to the ADS129x family of biopotential AFEs. Unlike the ADS1292 which offers two channels, the ADS1291 provides a single-channel solution. It shares architectural similarities with the ADS1294 and ADS1298 but differs in channel count and specific feature sets such as the number of integrated amplifiers for Wilson Central Terminal generation found in higher-channel variants.

Analog Front End (AFE) Replacement Considerations

The ADS1291IPBS is a direct functional substitute differing only in packaging (tray vs. reel). For multi-channel requirements, the ADS1292RIRSMT offers dual-channel capability in a VQFN package. Higher channel counts are available in the ADS1294 or ADS1298 series.