Electronics > Projects, Designs, and Technical Stuff

Audio HP Amp TI LM4811 - am I getting crazy?

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Saimoun:

--- Quote from: magic on July 30, 2020, 07:50:11 am ---Again, are you sure there is no problem with VDD and the chip isn't taking power through ESD diodes from other pins?

--- End quote ---

That's a good point - I did check on the VDD pin directly and it's getting +5V. But yes very interesting when I remove the +5V and let the VDD pin float - I get the exact same result = the voltage on the voltage pin follows the CLOCK pin.
But it's only the clock pin (whether I have VDD connected or not), if I move the up/dn or the shutdown pin nothing happens.

magic:
 :wtf:
Can you desolder the chip and check if VDD has any internal connection? You should be able to detect something using diode test between different pins.

Maybe you damaged it somehow :-//

Saimoun:
I still have two more chips so I could test with them. I tested with two already tho - and both have the same issue.

But I am starting to think maybe Mouser (yes it was Mouser not digikey actually) sent the wrong chips? I would never think that would be possible but the marking says 8565 G11 for a chip named LM4811?!

I have been googling for a SSOP-10 package with 8565 marking but without any luck. Quite terrible that the LM4811 datasheet does not show the marking!  |O

I also checked my order and it was the only SSOP-10 package so I could not have mixed it up with other chips. And the antistatic bag does say LM4811MM/NOPB.

EDIT: my bad the datasheet *does* show the marking, it says G11 and maybe with another marking, so it kinda seems it fits?

Saimoun:
But actually on LCSC the picture shows a 9235 G11 marking... Not sure how much we can trust this anyways :/

https://lcsc.com/product-detail/Audio-Power-OpAmps_Texas-Instruments-Texas-Instruments-LM4811MM-NOPB_C529566.html

magic:
It is possible and it rarely happens but the table in the datasheet says that marking is G11.

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