First of all I apologise if this has been covered elsewhere, but I'm blowed if I can find it.
I'm looking for information specifically relating to the hysteresis of the analogue comparator. The data sheet tells me everything but what I need to know and I've searched everywhere I can think of without luck.
Has anyone seen this data or know where I can find it please? Maybe you've used the comparator and know what these figures are likely to be?
I have the comparator working ok and at the moment I am comparing two voltages on AIN1 and AIN0. For the moment I have AIN0 connected to the internal 1.1 volt reference. AIN0 will ultimately be connected to an external reference - probably.
The issue I have is this, I am finding something like 10 to 15 millivolts of hysteresis between the comparator upper / lower trip points. Coming from an analogue background, that seems rather a lot to me. Now bearing in mind that presently this is all running on a STK500, it is possible there may be noise issues here. I am considering breadboarding this project with proper decoupling etc to see if this makes a difference but it would be nice to know beforehand if the hysteresis I am seeing is 'typical', noise induced or something else maybe. If I could get this figure down to something like 2 to 5 millivolts, that would be good. Otherwise I'll have to go with an external comparator and my 'neat one chip solution' will be sunk.