基于CB7135的自动量程转换电路

Automatic Range - changing Circuit Based on CB7135

介绍在双积分式A/D转换器CB7135的基础上实现自动转换量程的原理及电路.通过超、大量程信号控制双向移位寄存器的操作,获得合适的量程标志,根据量程标志切换反馈支路电阻及改变显示器小数点的位置,达到自动转换量程之目的.

This paper introduces the theory and circuit of how to realize automatic range-changing on the basis of dual-integral A/D converting chip CB 7135. This circuit uses the signals of beyond-range and under-range to control two-way shift register and get a right symbal of range, then according to the symbol of range, the circuit switchs the registance of feed back branch circuit and changs the place of decimal point of display device, realize the function of automatic rang - changing.