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OYTIS
OYTIS
Visitor II
December 26, 2020
Solved

Clipped sine TCXO for STM32WLE5

  • December 26, 2020
  • 1 reply
  • 1294 views

Greetings,

STM32WLE5 reference manual says an external TCXO should have a sinusoidal output. Clipped sine oscillators seem to be more available, do you think they would work too?

Thanks!

This topic has been closed for replies.
Best answer by Hamilton DC

Hi @OYTIS​ ,

Sorry about this statement, it's not correct. It will be corrected soon.

Clipped-sine output TCXO is required with an output amplitude not exceeding 1.2 V peak-to-peak.

Be aware,  in order to minimize spurious injection, the series capacitor value must be calculated such that an amplitude of 0.4 to 0.5 Vpk-pk on OSC_IN is obtained.

For a TCXO output voltage of 0.8 Vpk-pk, 10 pF as series capacitor can be used.

See datasheet "TCXO regulator" section for more detail.

Kind regards,

Hamilton

1 reply

Hamilton DC
Hamilton DCBest answer
Visitor II
January 4, 2021

Hi @OYTIS​ ,

Sorry about this statement, it's not correct. It will be corrected soon.

Clipped-sine output TCXO is required with an output amplitude not exceeding 1.2 V peak-to-peak.

Be aware,  in order to minimize spurious injection, the series capacitor value must be calculated such that an amplitude of 0.4 to 0.5 Vpk-pk on OSC_IN is obtained.

For a TCXO output voltage of 0.8 Vpk-pk, 10 pF as series capacitor can be used.

See datasheet "TCXO regulator" section for more detail.

Kind regards,

Hamilton

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