TI LMP92064 模拟前端电流、电压采样参考设计方案

TI公司的LMP92064是一款具有SPI接口的高精度低端数据电流、电压监测模拟前端芯片，该芯片通过内部精确电流传感器运放测量通过负载的分流器电阻电流量，并通过缓冲电压通道测量负载电压源。电流、电压采样为12位ADC采样，速率为同步125ksps，内部集成2.048V的ADC参考电压，在单向传感器计量中可以获得非常高精度的功率计算结果。本文首先介绍芯片的简介、特性、内部框图及应用领域，并给出相应设计方案的设计原理图、元器件列表及PCB元件布局图。

The LMP92064 is a precision low-side digital current sensor and voltage monitor with a digital SPI interface. This analog front-end (AFE) includes a precision current sense amplifier to measure a load current across a shunt resistor and a buffered voltage channel to measure the voltage supply of the load. The current and voltage channels are sampled simultaneously by independent 125 kSps 12-bit ADC converters, allowing for very accurate power calculations in unidirectional sensing applications.

The LMP92064 includes an internal 2.048V reference for the ADCs, eliminating the need of an external reference and reducing component count and board space.
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