Hello,
We are using one of your devices, i.e. TAS5717PHPR, and I am seeing a problem.
Specifically, the audio is not being produced unless I apply a little capacitance around or directly onto pins 14,15, or 16 from my finger. I can touch the hot end of the 18.2 resistor with a scope probe or even a small jewelers screwdriver, and the audio pops on. When I stated I applied capacitance, I meant that I placed the small screwdriver over the trace, covered with solder resist, so I am not physically touching the trace. I'm wondering why applying even a little capacitance to the trace (the small screwdriver) leading to the 18k resistor will activate the audio.
I have made sure the 18.2k resistor is correct.
The fallout has been about 15% - 8 units - the others work fine.
Your app note states the resistor on the A_SEL line should be 15k. Ours is only 10k and its a pulldown. Is that a game changer?
I sent our schematic to your chat line last Friday. I would greatly appreciate any feedback on why this part appears unstable. This is not a new design. Did the part change? Could it be counterfeit?
Curiously,
John Cerny
Sr. Quality Engineer
Newhaven Display International
