Microchip PIC18F87J72单相电表参考设计

Microchip公司的PIC18F87J72是集成了双路24位AFE,LCD驱动器的高性能微控制器,具有nanoWatt技术,每路的模拟特性包括90 dB SINAD, -101 dBc THD (到35次谐波)以及103 dB SFDR,和10ppm INL,差分输入引脚,可编程数据速率到64ksps,高增益PGA到32V/V,基准电压源低漂移(12ppm/度C),主要用在低成本电表,电源测量和监视,手持仪表和医疗监视.本文介绍了PIC18F87J72主要特性,功能框图,单相电表应用电路图以及PIC18F87J72单相电表参考设计主要特性,电路图,材料清单和PCB布局图.

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

- Low drift internal voltage reference (12 ppm/C)

- Programmable data rate to 64 ksps

- High-gain PGA on each channel (up to 32 V/V)

- Phase delay compensation between channels (1 ?s resolution)
..

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