MachXO2 internal clock tolerance / accuracy

[tcz2008]

Hi everyone!

I have a hard time finding the tolerance / accuracy for the internal oscillator for the MachXO2. I seem to remember it being around 5%, which isn't really that great.
Can anyone point me in the direction where that's definitively mentioned?!

Cheers!

-Mux

 

[Thomas Heller]

Am 14.02.2019 um 05:32 schrieb tcz2008:

I have a hard time finding the tolerance / accuracy for the internal
oscillator for the MachXO2. I seem to remember it being around 5%,
which isn't really that great. Can anyone point me in the direction
where that's definitively mentioned?!

It's even slightly worse than 5%:


MachXO2 Family Data Sheet, DS1035 Version 3.3, March 2017
page 3-33:

Oscillator Output Frequency (Commercial Grade Devices, 0 to 85°C)
125.685 133 140.315 MHz
Oscillator Output Frequency (Industrial Grade Devices, –40 °C to 100 °C)
124.355 133 141.645 MHz


MachXO2 sysCLOCK PLL Design and Usage Guide
March 2017 Technical Note TN1199,
page 28:

The MachXO2 device has an internal oscillator that can be used as a
clock source in a design. The internal oscillator accuracy is +/- 5%
(nominal). This oscillator is intended as a clock source for
applications that do not require a higher degree of accuracy in the clock.