Audible hiss and popping when using the beep generator in the TLV320AIC3204

george clarkson

Other Parts Discussed in Thread: TLV320AIC3204

Hi there,

I'm currently using the TLV320AIC3204 in a project at work and I'm currently having some issues with audible hisses and pops when I use the beep generator. I'm aware of the steps outlined on the wiki to remove pops and I believe I am following them.

w 30 00 00              # Page 0
w 30 40 0C              # Mute DACs
f 30 26 xxx1xxx1        # Wait for mute flag
w 30 0B 02              # Turn off NDAC
w 30 47 8C              # Beep!, -6dB Gain
w 30 0B 82              # Turn on NDAC
w 30 40 00              # Un-mute DACs
f 30 47 0xxxxxxx        # Wait for beep to finish

does anyone have any ideas or suggestions of steps that I could try to narrow down on what is causing this problem.

over 9 years ago

0 Luis Fernando Rodriguez S. over 9 years ago

TI__Guru* 84915 points

Hi, George,

Could you provide your entire register configuration, please? It is to have a better approach to this issue.

Thank you.

Best regards,
Luis Fernando Rodríguez S.

0 george clarkson over 9 years ago in reply to Luis Fernando Rodriguez S.

Intellectual 830 points

the registers should be set as default with the exceptions of the following list

P0R4 = 0x07

P0R5 = 0xa2

P0R6 = 0x20

P0R11 = 0x82

P0R12 = 0x82

P0R13 = 0x00

P0R14 = 0x80

P0R18 = 0x82

P0R19 = 0x84

P0R20 = 0x80

P0R60 = 0x19

P0R61 = 0x01

P0R63 = 0xd4

P0R81 = 0x00

P0R82 = 0x00

P1R1 = 0x08

P1R2 = 0x01

P1R9 = 0x30

P1R10 = 0x0a

P1R12 = 0x08

P1R13 = 0x08

P1R16 = 0x00

P1R17 = 0x00

P1R61 = 0x00

P1R71 = 0x31

P1R123 = 0x01

To trigger a beep I write the volume to P0R72, the frequency to P0R76,P0R77,P0R78,P0R79, the length to P0R73,P0R74,P0R75. I then trigger a beep using the steps outline in my opening post

0 Luis Fernando Rodriguez S. over 9 years ago in reply to george clarkson

TI__Guru* 84915 points

Hi, George,

I think that it could be related with the headphone driver power up behavior. I suggest to modify the Page 1 / Register 20: Headphone Driver Startup Control Register for a slow power up of the headphone driver. Also, is it possible to try with AVDD as you HP Power Source (see Page 1 / Register 10: Common Mode Control Register for details).

Additionally, you may take a look at this Application Report for more information about the beep generator.

Please let me know if you have more questions or comments.

Best regards,
Luis Fernando Rodríguez S.

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Audible hiss and popping when using the beep generator in the TLV320AIC3204