View Full Version : DAC tutorial question.
08-15-2005, 05:08 AM
I was reading the DAC tutorial, and came across,
The typical method for choosing how many cycles to charge is: cycles = 4 × R × C, in milliseconds.
Why is it 4?
08-15-2005, 11:52 AM
When I went to tech school I was taught 5 TCs (time constants) are required to charge (or discharge a capacitor). During each TC, the cap charages to 63% of the available span (between where it is and where it's going). For five volts, for example:
5: 4.97 <-- considered full charge at 5 TC
Applications Engineer, Parallax
For what it is worth, I was taught the same 5 TC's in school.