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Part Number: TS3A227E
My customer use TS3A227 in their Lenovo dock project. Lenovo complain about the pop issue when they power up their dock and connect its phone jack to an active speaker: 2 pop sound (maybe near 2KHz frequency) is heard. And we can see there's 2 pulse (5mV DC level) shown on L/R channels. We think that's detection function for 3/4 pole headset. but...
1. There's no pop sound heard by their TS3A225 product.
2. There's no pop sound founded when they connect their amp into jack.
Is anything we can do to reduce the pop(detect) sound on power up.... And why TS3A225 don't have the sound?
Thanks for your kindly help.
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The TS3A227E does not put a signal voltage on the L channel. During detection this pin is grounded. The TS3A227E is not connected to the R channel so it cannot be causing any noise on that pin. Is it possible to remove that TS3A227E from the board and see if the noise is still present?
In reply to Andrew_Mason:
We remove the audio source / IC in front of TS3A227 and still can see the small signal shown while powering up the system. So we think 227 might need a detect sequence -- although it's small and can't be heard in HP. FYI and thanks for your help.
In reply to Adam Torma:
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