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Defference of EVM circuit for TPA3110D2 and TPA3130D2

yoshiki hasebe
Mastermind 6385 points
Other Parts Discussed in Thread: TPA3130D2, TPA3110D2

Dear All,

I have a question.

A customer asked us why does the deffernce of AVCC  circuit  in EVM  TPA3130D2 and TPA3110D2.

EVM of TPA3110 is connected to AVCC through (10Ω) resistor R5 from PVCC.
But, EVM of TPA3130 is connected directly to the AVCC from PVCC. 

He said to us that sound quality is poor case that is connected directly to the AVCC from PVCC.

Also he is designing TPA3130D2 now.

So please inform us  for some question,as follows.

1.Why does the deffernce of AVCC  circuit  in EVM  TPA3130D2 and TPA3110D2.

2.Is it not a problem in the circuit of TPA3130D2, when you connect a resistor between PVCC-AVCC?

3.If that is no problem, how much tolerance of the resistance value ?

Best Regards,

Yoshiki Hasebe

 

  • 0
    TI__Mastermind 37045 points

    Hi Yoshiki-san,

    TPA3110D2 and TPA3130D2 are different designs. The 10R resistor on TPA3110D2 EVM is intended for noise filtering for the AVCC pin. To minimize BOM cost, TPA3130D2 is designed to meet datasheet performance without the 10R resistor on AVCC. Adding the 10R to AVCC on TPA3130D2 should be fine. However, avoid large resistor values since it will cause a significant voltage different between AVCC and PVDD.

    Can you describe more in detail how the sound quality is poor? Do you have any data or graph to quantify the issue?

    reg,

    Paul Chen

    Audio Applications

    Dallas TX USA