LMP91050MM/NOPB

Analog Front End (AFE) Overview

The LMP91050MM/NOPB is a configurable analog front-end (AFE) from Texas Instruments, designed for non-dispersive infrared (NDIR) sensing applications. It integrates a programmable gain amplifier (PGA), dark signal offset cancellation, and an 8-bit DAC. The device operates on a supply voltage range of 2.7 V to 5.5 V and features low noise (0.1 μVrms at 0.1–10 Hz). It supports external filtering via dedicated pins and offers programmable common-mode generation (1.15 V or 2.59 V). Packaged in a 10-lead MSOP, it provides a complete signal path solution between thermopile sensors and microcontrollers.

Analog Front End (AFE) Feature Summary

• Programmable Gain Amplifier with ranges of 167–1335 V/V (low) and 1002–7986 V/V (high)
• Dark signal offset cancellation using internal DAC
• Supports external high-pass, low-pass, or band-pass filtering
• Adjustable common-mode generator (1.15 V or 2.59 V)

Analog Front End (AFE) Applications

• NDIR gas sensing systems
• Demand control ventilation
• Automotive CO2 cabin control
• Industrial safety and security monitoring

Analog Front End (AFE) Procurement Notes

The LMP91050MM/NOPB is listed as End-of-Life (EOL) by the manufacturer. Verification of current availability requires checking authorized distributors for remaining stock or obsolete inventory. Designers should consider alternative components if long-term supply assurance is required for new production.

Analog Front End (AFE) Selection Notes

Select this component when interfacing with thermopile sensors requiring precise gain adjustment and offset cancellation. Ensure the application benefits from its low gain drift (100 ppm/°C) and phase delay stability. Verify that the MSOP-10 package fits the PCB layout constraints and that the 2.7–5.5 V supply range matches the system power architecture.

Analog Front End (AFE) Part Context

This part belongs to the LMP91050 series of AFEs optimized for NDIR applications. It serves as a specialized interface for thermopile sensors, replacing discrete solutions with a single integrated chip. The MM suffix indicates the MSOP-10 package variant, while NOPB denotes lead-free and RoHS compliance.

Analog Front End (AFE) Replacement Considerations

Due to the EOL status, direct substitutes are not explicitly confirmed in public documentation. Engineers may evaluate other TI AFEs or general-purpose instrumentation amplifiers, though specific pin-to-pin replacements require independent verification against the original design requirements.