LMP91050MMX/NOPB

Analog Front End (AFE) Overview

The LMP91050MMX/NOPB is a configurable analog front end (AFE) optimized for thermopile sensors in non-dispersive infrared (NDIR) sensing applications. It integrates a programmable gain amplifier (PGA), dark signal offset cancellation, and an adjustable common-mode generator to provide a complete signal path between the sensor and a microcontroller. The device operates on a power supply voltage range of 2.7 V to 5.5 V and features an 8-bit resolution. Key electrical specifications include a PGA gain range of 167 V/V to 7986 V/V, low noise of 0.1 μVrms (0.1 Hz to 10 Hz), and a maximum gain drift of 100 ppm/°C.

Analog Front End (AFE) Feature Summary

• Programmable Gain Amplifier (PGA) with gain settings from 167 V/V to 7986 V/V
• Dark signal offset cancellation capability
• Adjustable common-mode generator supporting 1.15 V or 2.59 V outputs
• Low noise performance of 0.1 μVrms in the 0.1 Hz to 10 Hz band

Analog Front End (AFE) Applications

• NDIR gas sensing systems
• Demand control ventilation
• Building monitoring
• CO2 cabin control in automotive environments
• Alcohol detection in automotive applications

Analog Front End (AFE) Procurement Notes

Verify the specific suffix 'MMX' against official Texas Instruments documentation to confirm tape-and-reel packaging and exact pinout compatibility. Ensure the component meets RoHS compliance requirements as indicated by the NOPB designation. Cross-reference the datasheet revision date to confirm technical parameters remain unchanged.

Analog Front End (AFE) Selection Notes

Select this AFE when designing NDIR systems requiring support for multiple thermopile sensitivities within a single hardware design. The wide programmable gain range allows adaptation to various sensor types without discrete component changes. Consider the low gain drift and phase delay specifications for high-precision temperature compensation requirements.

Analog Front End (AFE) Part Context

The LMP91050 belongs to the LMP91050 series of sensor AFEs developed by Texas Instruments. It is designed to replace multiple discrete solutions by integrating the necessary signal conditioning stages into a single MSOP-10 package. This integration simplifies the design process for infrared gas detection platforms.

Analog Front End (AFE) Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify functional equivalence with other TI sensor AFEs only if explicitly documented in official cross-reference lists.