2007-01-06 16:33:46 · 2 answers · asked by Gayan S 1 in Science & Mathematics ➔ Engineering
There are two types of ADC.
A flash ADC consists of a ladder of semiconductors, which when the Voltage spills over any given "rung" then that rung's number is encoded onto a binary data bus.
The other type charges a capacitor with the input signal and then discharges it through a fixed resistor (counting the pulses of a local oscillator as it goes). When the Voltage drops below a threshold the count is gated out to the data bus.
The first is very fast but the second one is fast enough for audio grade analog to digital conversion. Both are fast enough for a human read DVM.
2007-01-06 20:16:23 · answer #1 · answered by J C 5 · 0⤊ 0⤋
A to D converters utilize DC logic to sample varying levels of an analog input. As you cross each threshold in voltage you activate (forward bias) another circuit. This stepped progression is also used for audio signal sampling.
2007-01-07 21:40:08 · answer #2 · answered by Chi Guy 5 · 0⤊ 0⤋