Hello Group ( I hope there are people still out there ), I have an issue with clock drift with temperature. I have a -20 to +60C 4.194 MHz crystal on a 68376 design. As I get the temperature up to about 50 C, I start to see the CLKOUT pin frequency drop. The normal rate is 20.45 MHz (picked for CAN reasons) At about 50C clock out is 20.09 MHz , at 60 C -> 19.63 MHz. This more than +/- 50 ppm spec of the crystal. I am using a 1.5 K ohm series resistor and 22 pF load caps. I have tried 27 pF as well. I am using the high stability VCO filter too. Anyone have some pointers as to how to correct this? Tim Flynn RMS Welding Systems Ph.(780)955-3907 http://www.rmsweldingsystems.com [Non-text portions of this message have been removed]
Message
Clock drift
2005-06-03 by Tim