Hello All,
I have a board that produces a 0-8V analog signal. The signal is actually 0-40V, but there's an op-amp attenuator on board which reduces it to 0-8V. There is no way I can tap the original signal, and I cannot change anything on the board.
Given the above constraints, I'm designing a new board that has to process this 0-8V signal and digitize it. Most cheap ADCs are 0-5V input compatible. There are a couple of +-10V ADCs from Analog Devices, but they don't meet my other requirements of internal reference, serial communication and low pin-count.
So I guess I have to attenuate this signal further, coming to my question - Is it ok if I simply use two resistors in series as a potential divider to step this down? Or do I have to use an op-amp attenuator? If yes, is it ok to have two consecutive op-amp stages?
I'm no analog expert!
Thanks,
Pre_Shan.