Pommie said:D2A use a R2R network.
A2D use a R2R network and feed the output to a comparator with the unknown voltage on the other input. You start by just setting the highest bit, if it produces a voltage higher than the unknown then that bit is zero (otherwise one) and you move on to the next bit.
dknguyen said:THat's the cheaper way to do a resistor divider ADC rather than using a bunch of comparators with different sources- you just have to switch the switches in the dividers much faster than the signal is changing.
This might be easier for you to type, but for old farts like me, it makes the reading more difficult.u, plzz, dint, ryt, coz