8253 芯片实现 V/F 变换方法的探讨

Study\ of\ V/F\ Conversion\ by Programable\ Interval\ Timer(8253)

用Ｖ／Ｆ实现Ａ／Ｄ变换，其转换精度可高达１６位，而价格又相对低廉。在阐述了单片机实现Ｖ／Ｆ变换后，提出了用定时器／计数器８２５３构成的可同时对三个模拟量实现Ｖ／Ｆ变换的装置。给出了电路示意图和程序框图。

A/D conversion can be realized through V/F conversion.Its precision reaches 16 bit while the price is comparatively cheap.This paper introduces the way how the V/F conversion is accomplished using single chip processor,and presents a device consisting of programable interval timer 8253 which can realize three V/F conversions at the same time.The schematic circuit diagram and flowchatr are given in this paper.