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TAS5751M: The issue for muted TAS5751M because of the PLL autolock error

Part Number: TAS5751M

I will appreciate it if you can give me some information about the PLL autolock error of TAS5751.

TAS5751M was muted because of the PLL autolock error. The schematic of TAS5751M is shown as below:

I'd like to know the two parts of TAS5751:

1. What's the mean of PLL autolock error? when will occur PLL autolock error?

2.The external circuit of PLL is different with EVM of TAS5751M, Why we place the current parameters on EVM of  PLL_FLTP,PLL_FLTM, GVDD_REG? Is this best group for TAS5751M?