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Part Number: TPA6139A2
We are using the TPA6139A2 with a 3.9 kohm (1%) gain setting resistor. I have measured the resistor value to be 3903 ohm.
The gain in the TPA6139A2 should then be 20 dB. However, on our recently produced boards it does not work. The gain seems to be the default (6 dB). When I add 100 ohm resistance (totalling 4.0 kohm) the gain becomes 20 dB. This is however outside the datasheet specification (which states 2 % tolerance on gain resistor value).
We have not seen this behaviour on our 10 previously produced boards.
Component marking for TPA6139 on the old boards: 2BTG4 CHN.
Component marking for TPA6139 on the new boards: 14TG4 C5VT.
As a side note:
In the datasheet it says "Gain setting is latched when the MUTE pin is set high". This does not seem correct, the only time it is latched (as far as we can see) is at power up.
The datasheet also reference "Rfb", which I believe is a copy paste error from some other datasheet.Regards, Jonas
In reply to Ivan Salazar:
Hi Ivan and thanks for the quick reply.
It is very urgent for us to resolve this since customers are waiting for us to ship the product.
Can I do anything (like measurements) immediately that would help?
Should i desolder a part and send it to you?
In reply to user4497266:
It is present on several (at least 10 I would say) devices.
Each of our boards have 4 devices and on one of them, 2 of the devices work but the other 2 don't.
Since it is production boards I have chosen not to modify them too much. But I will change 4 devices on one of the boards tomorrow morning and see what happens.
You can mail me at:
Regards, Jonas Aberg
Do you have any update? I have not received any mail from you yet. Regards, Jonas
[Handled off-line Issue resolved]
This issue is not resolved by any means!
Trying different resistor values until it seems to work is not an acceptable answer.
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