TI 公司的LMP91050是可编程的传感器模拟前端（AFE），最适合用于温度传感器和非分散红外（NDIR）检测应用。器件提供了传感器和MCU间完整的通路，可编程增益从167V/V到7986V/V，工作电压2.7V 到5.5V，(0.1 到10 Hz)噪音为 0.1μVRMS，最大增益漂移为100 ppm/℃，相位漂移为500ns，主要用在NDIR检测，通风控制，建筑物监测，汽车电子的CO2舱控制和酒精检测，GHG和氟利昂检测平台。本文介绍了LMP91050主要指标和特性，方框图，典型NDIR传感应用电路图以及SPIO-4精密信号通路控制器板主要特性，方框图，电路图和PCB元件布局图。
Configurable AFE for Nondispersive Infrared (NDIR) Sensing Applications
The LMP91050 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 LMP91050 s programmability 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 (1.15V or 2.59V) which increases output dynamic range. The PGA offers a low gain range of 167V/V to 1335V/V plus a high gain range of 1002V/V to 7986V/V which enables the user to utilize thermopiles with different sensitivities.
LMP91050主要指标：
■ Programmable gain 167V/V to 7986V/V
■ Low noise (0.1 to 10 Hz) 0.1μVRMS
■ Gain Drift 100 ppm/°C (max)
■ Phase Delay Drift 500ns (max)
■ Power supply voltage range 2.7V to 5.5V
LMP91050主要特性：
Programmable gain amplifier
"Dark Signal" offset cancellation
Supports external filtering
Common mode generator and 8 bit DAC
10 pin MSOP package
LMP91050应用：
NDIR sensing
Demand control ventilation
Building monitoring
CO2 cabin control — Automotive |
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