Product details

Number of input channels 1 Features PGA Operating temperature range (°C) -40 to 105 Vs (min) (V) 2.7 Vs (max) (V) 5.5 Interface type Serial SPI Rating Catalog
Number of input channels 1 Features PGA Operating temperature range (°C) -40 to 105 Vs (min) (V) 2.7 Vs (max) (V) 5.5 Interface type Serial SPI Rating Catalog
VSSOP (DGS) 10 14.7 mm² 3 x 4.9
  • Programmable Gain Amplifier
  • Dark Signal Offset Cancellation
  • Supports External Filtering
  • Common-Mode Generator and 8-Bit DAC
  • Key Specifications
    • Programmable Gain 167 to 7986 V/V
    • Low Noise (0.1 to 10 Hz) 0.1 µVRMS
    • Gain Drift 100 ppm/°C (Maximum)
    • Phase Delay Drift 500 ns (Maximum)
    • Power Supply Voltage Range 2.7 to 5.5 V
  • Programmable Gain Amplifier
  • Dark Signal Offset Cancellation
  • Supports External Filtering
  • Common-Mode Generator and 8-Bit DAC
  • Key Specifications
    • Programmable Gain 167 to 7986 V/V
    • Low Noise (0.1 to 10 Hz) 0.1 µVRMS
    • Gain Drift 100 ppm/°C (Maximum)
    • Phase Delay Drift 500 ns (Maximum)
    • Power Supply Voltage Range 2.7 to 5.5 V

The LMP91050 device is a programmable integrated Sensor Analog Front End (AFE) optimized for thermopile sensors, as typically used in NDIR applications. It provides a complete signal path solution between a sensor and microcontroller that generates an output voltage proportional to the thermopile voltage. The programmability of the LMP91050 enables it to support multiple thermopile sensors with a single design as opposed to the multiple discrete solutions.

The LMP91050 features a programmable gain amplifier (PGA), dark phase offset cancellation, and an adjustable common-mode generator (1.15 V or 2.59 V) which increases output dynamic range. The PGA offers a low-gain range of 167 V/V to 1335 V/V plus a high-gain range of 1002 V/V to 7986 V/V which enables the user to use thermopiles with different sensitivities. The PGA is highlighted by low-gain drift (100 ppm/°C), output offset drift (1.2 mV/°C at G = 1002 V/V), phase delay drift (500 ns) and noise specifications (0.1 µVRMS 0.1 to 10Hz).

The offset cancellation circuitry compensates for the by adding an equal and opposite offset to the input of the second stage, thus removing the original offset from the output signal. This offset cancellation circuitry allows optimized usage of the ADC full scale and relaxes ADC resolution requirements.

The LMP91050 allows extra signal filtering (high-pass, lowpass or bandpass) through dedicated pins A0 and A1, in order to remove out of band noise. The user can program through the on board SPI interface. Available in a small form factor 10-pin package, the LMP91050 operates from –40 to 105°C.

The LMP91050 device is a programmable integrated Sensor Analog Front End (AFE) optimized for thermopile sensors, as typically used in NDIR applications. It provides a complete signal path solution between a sensor and microcontroller that generates an output voltage proportional to the thermopile voltage. The programmability of the LMP91050 enables it to support multiple thermopile sensors with a single design as opposed to the multiple discrete solutions.

The LMP91050 features a programmable gain amplifier (PGA), dark phase offset cancellation, and an adjustable common-mode generator (1.15 V or 2.59 V) which increases output dynamic range. The PGA offers a low-gain range of 167 V/V to 1335 V/V plus a high-gain range of 1002 V/V to 7986 V/V which enables the user to use thermopiles with different sensitivities. The PGA is highlighted by low-gain drift (100 ppm/°C), output offset drift (1.2 mV/°C at G = 1002 V/V), phase delay drift (500 ns) and noise specifications (0.1 µVRMS 0.1 to 10Hz).

The offset cancellation circuitry compensates for the by adding an equal and opposite offset to the input of the second stage, thus removing the original offset from the output signal. This offset cancellation circuitry allows optimized usage of the ADC full scale and relaxes ADC resolution requirements.

The LMP91050 allows extra signal filtering (high-pass, lowpass or bandpass) through dedicated pins A0 and A1, in order to remove out of band noise. The user can program through the on board SPI interface. Available in a small form factor 10-pin package, the LMP91050 operates from –40 to 105°C.

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Technical documentation

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Type Title Date
* Data sheet LMP91050 Configurable AFE for Nondispersive Infrared (NDIR) Sensing Applications datasheet (Rev. E) PDF | HTML 30 Sep 2015
User guide SPIO-4 Precision Signal-Path Controller Board User Guide (Rev. A) 05 May 2018
Application note LMP91051 NDIR CO2 Gas Detection System 09 May 2013
Application note AN-2260 MSP430 Interface to LMP91050 Code Library (Rev. A) 01 May 2013
More literature Sensor Analog Front Ends Brochure 30 Oct 2012
EVM User's guide LMP91050 Evaluation Board with Sensor AFE Software User’s Guide 22 Mar 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LMP91050SDEVAL — Sensor AFE Eval Platform for NDIR Applications

The LMP91050 evaluation board (LMP91050SDEVAL) can be used as stand-alone or as part of Sensor AFE eval platform (refer to the Sensor AFE platform page for software and required hardware). It the LMP91050 can be configured via the SPI interface and allows for testing the device with thermopile (...)

User guide: PDF
Not available on TI.com
Driver or library

SNAC047 Associated Files for Application Note MSP430 Interface to LMP91050 Code Library

Supported products & hardware

Supported products & hardware

Products
Signal conditioners
LMP91050 Configurable AFE for Nondispersive Infrared (NDIR) Sensing Applications LMP91051 Configurable AFE for (NDIR) Sensing Applications
Simulation model

LMP91050 Macromodels

SNAM032.ZIP (4 KB) - Macromodels
Simulation model

LMP91050 PSpice Model

SNAM033.ZIP (4 KB) - PSpice Model
Package Pins Download
VSSOP (DGS) 10 View options

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