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TAS5558: issues when using external karaoke smartphone input

Part Number: TAS5558

Hi team,

The customer uses TAS5558 case-1 (Figure 1) to input analog microphone signals through SDIN5. When the external sound card is changed to (24bit 48000, as shown in Figure 2 below) (the measured TAS5558 MCLK is 12.288MHZ and the sampling rate is 48Khz), the power amplifier output will have a relatively fixed frequency noise of 3-4khz.

The external sound card is changed to (24bit 44100, as shown in Figure 2 below) (the measured TAS5558 MCLK is 11.289MHZ, the sampling rate is 44.1KHz,) without noise. 

Is this noise related to the register setting of TAS5558 ?

 fig.1

 Fig.2

 Fig.3

0XC5 寄存器设置为:  D31-D24  0x07

                                     D23-D16  0x01

                                     D15-D8   0x00

                                      D7-D0  0X02

Best Regards,

Amy Luo