Pretty much. Just need to be very stable source and a lot of generic engineering around to not incur error.
Hell, that's actually very easy way to make ADC, just start counting, charge cap to pre-determined value then trigger counter stop. There are few improvements to that technique (like dual slope ADC, where you use reference voltage to discharge the cap to get the ratio between reference and input signal) but in general it can be very accurate way to measure.
Hell, that's actually very easy way to make ADC, just start counting, charge cap to pre-determined value then trigger counter stop. There are few improvements to that technique (like dual slope ADC, where you use reference voltage to discharge the cap to get the ratio between reference and input signal) but in general it can be very accurate way to measure.