《电子技术》1986年第10期“数字电压表BCD码输出稳定性的提高”一文指出,利用4~1/2位高精度双积分式A/D转换器ICL 7135的数字电压表电路,在将其输出的串行BCD码变换成并行BCD码时可能出现错误,并分析了出错的原因,给出了解决方法。本文将介绍另一种提高BCD码输出稳定性的方法。实际上,ICL7135的设计者已考虑到输出的BCD码与位扫描信号间可能产生的竞争冒险,特设置了专 “Electronic Technology” 1986 the tenth period “digital voltmeter BCD code output stability,” one article pointed out that the use of 4 to 1/2 high precision double integral A / D converter ICL 7135 digital voltmeter circuit, in the The output serial BCD code into parallel BCD code may be wrong, and analyzed the cause of the error, given the solution. This article will introduce another method to improve the output stability of BCD codes. In fact, designers of the ICL7135 have taken into account the potential competition between the output BCD code and the bit-scan signal,