Clock vs. Crystal Oscillator
Clock vs. Crystal Oscillator
(OP)
I am designing a low-power embedded system using a 186. I and trying to decide on a clock vs. a crystal for the processor and an external DUART I am using. Both can use a crystal or external clock. I have used both before and know that generally a clock is easier, you don't have to mess with balancing capacitances. I would be using a standard fundamental mode crystal circuit if I went that route. The processor needs 32MHz and the UART needs 3.6864MHz. Clocks I have found run at around 15mA at 3.3V. That is a third of the processors total current draw. Would a crystal draw less current? I am only making one of these so cost is not a constraint. What other things should I consider? Space is an issue but I have found clocks that are the same size as crystals. Is one more stable than the other, the board will be subjected to significant shock and vibration. Does anyone have any experience or knowledge on this subject?
RE: Clock vs. Crystal Oscillator
RE: Clock vs. Crystal Oscillator
RE: Clock vs. Crystal Oscillator
http://www.bliley.com/
Steve Owens
Finish Line Product Development Services
Steve.Owens@FinishLinePDS.com
www.FinishLinePDS.com
RE: Clock vs. Crystal Oscillator
RE: Clock vs. Crystal Oscillator
<nbucska@pcperipherals.com>
RE: Clock vs. Crystal Oscillator
RE: Clock vs. Crystal Oscillator
LINEAR'r LTC6900 gives better than 2% accuracy with 1% R.
<nbucska@pcperipherals.com>
RE: Clock vs. Crystal Oscillator
Also, see if you can PLL up the 3.6864MHz (crystal or resonator) to the 32MHz. You don't have to place another device.
RE: Clock vs. Crystal Oscillator
<nbucska@pcperipherals.com>