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TAS5711: OC_ADJ pin

Kum Hoo Lee
Expert 1855 points
Part Number: TAS5711
Other Parts Discussed in Thread: TAS5707

Dear Sir/ Madam,

I have an issue with the TAS5711 speaker amp on my new PCB, I do not see  PVDD/2 at my output after I initializes the speaker amp.  After probing the signals, I found that "OC_ADJ" measures only 1.25V compared to the 3.3V of the TAS5711 EVKit.

Can help to explain the state of TAS5711 and why it output only 1.25V at "OC_ADJ" pin?

By the way, the  pin7 naming from Datasheet (OC_ADJ) but EVM user guide is (AC_ADJ), may I know are they the same?

Hope to hear from you soon.

Thanks and best regards,

KH

 

  • 0
    TI__Mastermind 24835 points
    Hi KH,
    How much is the RMS voltage on the output pins? It's supposed to be PVDD/2 if there is no input signal or the device is in the MUTE state. Did you measure the waveform on the output pins, it should be 50% duty-cycle square waveform after initialization(in MUTE state).
    Could you please double-check the voltage on the OC_ADJ pin on your EVM board? Your measured result 3.3V is quite high. Please refer to this E2E post e2e.ti.com/.../204406
    It's about TAS5707 and there is a little difference between TAS5707 and TAS5711, but basically they are very similar. I believe this post helps your understanding on the OC_ADJ function.
    It should be 'OC_ADJ' instead of 'AC_ADJ' in the EVM user's guide. Sorry for the typo.
    If you are using 22.1kOhm resistor for OC_ADJ pin, I don't think there is any problem in it. Please check the following:
    1. Is I2C communication working normally?
    2. Check your initialization register file, try and see if it can initialize the device on the EVM board.
    3. Compare your SCH to TAS5711 EVM SCH, see if there is any difference that could cause the initialization failure.
    Best regards,
    Shawn Zheng