Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

CPLD EPM570 internal oscillator clock stability

Hello, I understand the absolute frequency of the internal oscillator is not known and varies with temperature and device charge between 3.3 MHz and 5.5 MHz. Fortunately for my project the absolut...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

The internal oscillator isn't intended for precise timing purposes, so it's pretty understandable that no other parameters than frequency range are specified. You should measure it yourself.

Just for comparison, I see with the MAX10 internal oscillator about 1e-3 relative jitter, e.g. 1 ns peak-to-peak after 1 µs delay. Short term stability seems acceptable.