What means by decouple

Paswa · 22nd October 2007, 01:38 PM

In datasheet of TDA2050, they said to properly decoupl INPUT1 and INPUT2 from ground.

CAN You explain "DECOUPLE" and how to do this.....I'm a newbie..,he!he!

peranders · 22nd October 2007, 01:44 PM

In this case, don't mix power ground with signal ground. Don't let currents in the ground coming from the speaker mix with the input ground. Take a look at the pcb layout in the datasheet. Do you see how the ground from the input meets the power ground?

marce · 22nd October 2007, 02:08 PM

Reading the thompson data sheet and having a look at thier layout, i would agree with Peranders, that it is actualy star grounding and not realy decoupling in the real sense, that Thompson are on about, it is a confusing use of terminology IMO.
Decoupling is when capacitors are used to electricaly isolate a pin from a ground (or two grounds from each other, not so much used these days) for generaly two reasons, one to provide a low impedance path for any noise at the pin, and in the case of supply pins to provide the instantaneous current required during fast switching (or large bass transients) for the small amout of time it takes the PSU to deliver the power itself.

22nd October 2007, 01:38 PM	#1
Paswa diyAudio Member Join Date: Aug 2007	What means by decouple In datasheet of TDA2050, they said to properly decoupl INPUT1 and INPUT2 from ground. CAN You explain "DECOUPLE" and how to do this.....I'm a newbie..,he!he!

22nd October 2007, 01:44 PM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	In this case, don't mix power ground with signal ground. Don't let currents in the ground coming from the speaker mix with the input ground. Take a look at the pcb layout in the datasheet. Do you see how the ground from the input meets the power ground? __________________ /Per-Anders (my first name) or P-A as my friends call me

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22nd October 2007, 02:08 PM	#3
marce diyAudio Member Join Date: Jun 2007 Location: Blackburn, Lancs	Reading the thompson data sheet and having a look at thier layout, i would agree with Peranders, that it is actualy star grounding and not realy decoupling in the real sense, that Thompson are on about, it is a confusing use of terminology IMO. Decoupling is when capacitors are used to electricaly isolate a pin from a ground (or two grounds from each other, not so much used these days) for generaly two reasons, one to provide a low impedance path for any noise at the pin, and in the case of supply pins to provide the instantaneous current required during fast switching (or large bass transients) for the small amout of time it takes the PSU to deliver the power itself.

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