8098单片机10位A/D扩展为12位存在的问题

Problems in Expanding A/D Converter of Single Chip Microcomputer from 10 bit to 12 bit

在描述８０９８单片机的１０位Ａ／Ｄ转换扩展为１２位Ａ／Ｄ转换方法原理的基础上，提出提高８０９８单片机Ａ／Ｄ转换率的理论可行性，分析了实际应用中基准电源电压精度、分档电阻不一致性以及运放电路精度等对提高分辩率的影响。使用普通元器件和工艺不可能获得理论期望值。

It is theoretically possible to expand the A/D converter of the 8098 single chip microcomputer from 10 bit to 12 bit. But a series of factors are bound to effect the resolution of the converter, such as voltage precision of the datum power, non uniformity of the divider resistances and precision of the operational amplifier. Analysing all these factors, it is concluded that it is impossible to attain the theoretical expectation by using ordinary components and conventional process technology.