FEDEVEL
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rdpdo , 06-29-2024, 12:03 PM

Hello everyone !

In LVDS technical documentation, it is recommended to place decoupling capacitors on LVDS chips of 0.1uF / 0.01uF / 0.001uF (the lowest closer to the component).

Should I do the same for the other components of my electronic card, which receive the signals converted to TTL or which send the TTL signals which will be converted to LVDS?

My other components are:

LDO 3.3V TPS7A2033 (in the datasheet the decoupling capacitor is 2.2uF at input and 2.2uF at output) => should I add the 0.1 / 0.01 and 0.001uF?

MEM Accelerometer IIM-42352: in the doc, the capacitors are 0.01uF for VDDIO and 0.1/2.2uF for VDD => same, should I add the 0.1/0.01/0.001?

I'm not close to a few euros and so it doesn't bother me... But will it bring a plus?

A big thank you to all !

QDrives , 06-29-2024, 01:11 PM

https://www.signalintegrityjournal.com/articles/1589-the-myth-of-three-capacitor-values
https://www.youtube.com/watch?v=y4REmZlE7Jg

rdpdo , 06-29-2024, 04:03 PM

Thanks you @QDrives , I will look that 👍

Robert Feranec , 06-30-2024, 04:48 AM

If they are all the same type, I don't think it would make difference if you place three of them or only 100nF. But that is only my opinion. I would recommend to watch this: https://youtu.be/ARwBwHZESOY

rdpdo , 07-01-2024, 09:37 AM

Thanks you !