Hi,

I have an analogue dc signal of 0 to 5V. I have two 8 bit A/D converters. I would like to split the 0-5V signal into two 0-2.5V signals so that I can use two 8 bit A/D converters (rather than just one) to improve the resolution of the measurement between 0 and 5VDC ie 256bit resolution (A/D #1) for 0-2.5V, then 256bit resolution (A/D #2) for the 2.5v-5v range.

Can I do this with a resistor voltage bridge?

Thanks

 

Nope. But you could do it with some simple op amp circuits.

 

I have always wanted to try the following circuit but I have never tried it.

Perhaps you can tell me if it works or not by building it. The TL431 is an accurate 2.5V regulator working as a zener here.

 

This would work, but you really need to be able to tweak the voltage a little, as it is unlikely that both components would be right on value.