External 40MHz oscillator insted the usual crystall
Posted: Wed Aug 20, 2025 3:14 pm
Hi all,
for a new pro-audio project based on ESP32-S3, i need to have a very precise and stable 40Mhz clock. To solve the problem i have used an external TXCO 40MHz oscillator instead the crystall. At first i connected the clock signal on the Xtal_n pin, it seemed to be going well but sometimes, on same samples, the esp32 is instable: it turns off, the serial console doesen't work, the display lost sync..
So to solve the problem, then i connected the clock on the Xtal_p, and so far everything seems to be going well.
i'm quite concern, and i would like to know the right way to use an external 40mhz source for esp32-s3.
is it possible to use an external TCXO as 40Mhz clock source?
which pin is necessary to use Xtal_n or p ?
Can i connect the TCXO output directly on the Xtal_p/n pin or is it preferable to place a decoupling capacitor?
i'm waiting for your kindly and fat reply
thanks
for a new pro-audio project based on ESP32-S3, i need to have a very precise and stable 40Mhz clock. To solve the problem i have used an external TXCO 40MHz oscillator instead the crystall. At first i connected the clock signal on the Xtal_n pin, it seemed to be going well but sometimes, on same samples, the esp32 is instable: it turns off, the serial console doesen't work, the display lost sync..
So to solve the problem, then i connected the clock on the Xtal_p, and so far everything seems to be going well.
i'm quite concern, and i would like to know the right way to use an external 40mhz source for esp32-s3.
is it possible to use an external TCXO as 40Mhz clock source?
which pin is necessary to use Xtal_n or p ?
Can i connect the TCXO output directly on the Xtal_p/n pin or is it preferable to place a decoupling capacitor?
i'm waiting for your kindly and fat reply
thanks