Microchip PIC18F87J72 单相电表解决方案

Microchip 公司的PIC18F87J72 是高性能MCU，采用nanoWatt技术，具有两路24位模拟前端（AFE），LCD驱动器。每路的SINAD为-90dB，THD为-101dBc，SFDR为103dB,低漂移内部基准电压（12 ppm/℃)，可编程数据速率到64ksps,增益高达32V/V，目标应用在电表，功率测量和监视，手提仪表和医疗监视。本文介绍了PIC18F87J72主要特性，方框图，单相电表应用电路以及PIC18F87J72单相电表参考设计主要特性和电路图。

PIC18F87J72：80-Pin, High-Performance Microcontrollers with Dual Channel AFE, LCD Driver and nanoWatt Technology

This document contains device-specific information for the following devices:

• PIC18F86J72

• PIC18F87J72

This family combines the traditional advantages of all PIC18 microcontrollers – namely, high computational performance and a rich feature set – with a versatile on-chip LCD driver and a high-performance, high-accuracy analog front end. These features make the PIC18F87J72 family a logical choice for many high-performance power and metering applications where price is a primary consideration.

PIC18F87J72主要特性：

Analog Features:

• Dual-Channel, 24-Bit Analog Front End (AFE):

- 90 dB SINAD, -101 dBc THD (to 35th harmonic),103 dB SFDR for each channel

- 10 ppm INL

- Differential voltage input pins
..

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