ESP32 S2 External Crystal Clock Source waveform

zsolim
Posts: 1
Joined: Mon Sep 29, 2025 10:56 am

ESP32 S2 External Crystal Clock Source waveform

Postby zsolim » Mon Sep 29, 2025 11:21 am

Hi,
I'm designing custom PCB for ESP32 S2 SoC. For some reasons I want to use oscillator (OCXO) instead of crystal.
What are the requirements for External Crystal Clock Source waveform? Can I use OCXO with sine output waveform?

I was looking for the requirements in Hardware Design Guidelines but I found only that:
-the oscillator output is stable and its accuracy is within ±10 ppm,
-It is recommended that the amplitude of the crystal is greater than 500 mV.

Greetings

MicroController
Posts: 2663
Joined: Mon Oct 17, 2022 7:38 pm
Location: Europe, Germany

Re: ESP32 S2 External Crystal Clock Source waveform

Postby MicroController » Tue Sep 30, 2025 12:43 pm

Can I use OCXO with sine output waveform?
Should be fine. After all, a crystal also creates a sinusoidal signal.

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