Jignesh, said,

I'm curious how you intend to obtain any information from the Busy, Clock, and Polarity signals. Those signals are presumably similar for each conversion. The data is contained on the BCD outputs, demultiplexed with the digit strobes.

The clock is a maximally 120-kHz-frequency INPUT to the ICL7135. Busy tells you when it's finished a conversion, and polarity, well, it's supposed to drive the negative sign on a display.

I asked you what information you hope to extract from (a) a signal that you send to the ADC (clock), (b) the signal that says is't doing a conversion, and (c) the signal that drives the sign bit of the display? If you had read the datasheet for this part, then you'd know that.

Perhaps you should look for and read the datasheet. Also, there's an app-note out there on the www that explains how dual-slope integration works. That's applicable to your case, too. It's not exactly like successive approximation, wherein you could monitor the count, the sense of the current comparison, and the conversion-complete signal and deduce the result to within one LSB. That's not the case here.

RE