NS LMP90100传感器模拟前端(AFE)解决方案

NS公司的LMP90100是传感器模拟前端(AFE)系统,是多路低功耗24位的传感器AFE,具有精密的24位Sigma-Delta ADC和低噪音可编增益放大器(1x - 128x)和全差分高阻抗模拟输入复接器.ENOB/NFR高达21.5/19位,失调误差8.4nV,增益误差7ppm,总噪音小于10 μV-rms,输出数据速率(ODR)为1.6775 SPS - 214.65 SPS,主要用在温度和压力发送器,应力仪接口和工业过程控制.本文介绍LMP90100主要特性和指标, 方框图,多种典型应用案例和配置电路, LMP90100EB评估板电路图和材料清单.
LMP90100：Sensor AFE System: Multi-Channel, Low Power 24-Bit Sensor AFE with True Continuous Background Calibration
The LMP90100 is a highly integrated, multi-channel, low power 24-bit Sensor AFE. The device features a precision, 24-bit Sigma Delta Analog-to-Digital Converter (ADC) with a low noise programmable gain amplifier and a fully differential high impedance analog input multiplexer. A true continuous background calibration feature allows calibration at all gains and sample rates without interrupting the signal path. The background calibration feature essentially eliminates gain and offset errors across temperature and time, providing measurement accuracy without sacrificing speed and power consumption.
Another feature of the LMP90100 is continuous background sensor diagnostics, allowing the detection of open and short circuit conditions and out-of-range signals, without requiring user intervention, resulting in enhanced system reliability.
Two sets of independent external reference voltage pins allow multiple ratiometric measurements. In addition, two matched programmable current sources are available to excite external sensors such as resistive temperature detectors and bridge sensors. Furthermore, seven GPIO pins are provided for interfacing to external LEDs and switches to simplify control across an isolation barrier.
Collectively, these features make the LMP90100 a complete analog front-end for low power, precision sensor applications such as temperature, pressure, strain gauge, and industrial process control. The LMP901...