Comparator/ADC circuit help

chacko cherian

Hello,

I have 16 charge pump (CP) outputs at 8V that I need to measure. Since I am running out of measuring instruments, I am planning to have a comparator at the output of the charge pump and give me a digital out on whether the CP is at 8V or lower. But this loading of the comparator on the charge pump should be really small (in fA ). What IC's do I use in this applciation? Is there a better way of doing this with a multi-channel ADC?

Thanks in advance for your support.

Rgds,

over 14 years ago

Tom Hendrick over 14 years ago

TI__Guru**** 182731 points

Hi CC,

Using a window comparator and feeding that into the GPIOs of an MSP430 might be the simplest way to achieve what you want to do. That turns it into a basic 'go, no go' logic decision which would not need a precision data converter for the application.

chacko cherian over 14 years ago in reply to Tom Hendrick

Prodigy 20 points

My problem of keeping the loading on the charge pump to fA still remains. Any suggestions?

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Comparator/ADC circuit help