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 µV_RMS 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.

• 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

• Features
• PGA
• Operating temperature range (C)
• -40 to 105
• Vs (Min) (V)
• 2.7
• Interface type
• Serial SPI
• Vs (Max) (V)
• 5.5
• Rating
• Catalog

LMP91050的完整型号有：LMP91050MM/NOPB、LMP91050MME/NOPB、LMP91050MMX/NOPB，以下是这些产品的关键参数及官网采购报价：

LMP91050MM/NOPB，工作温度：-40 to 105，封装：VSSOP (DGS)-10，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LMP91050MM/NOPB的批量USD价格：1.483（1000+）

LMP91050MME/NOPB，工作温度：-40 to 105，封装：VSSOP (DGS)-10，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LMP91050MME/NOPB的批量USD价格：1.483（1000+）

LMP91050MMX/NOPB，工作温度：-40 to 105，封装：VSSOP (DGS)-10，包装数量MPQ：3500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LMP91050MMX/NOPB的批量USD价格：1.25（1000+）

LMP91050SDEVAL — 用于 NDIR 应用的传感器 AFE 评估平台

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 (...)