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TAS5352A output linearity

na na78
Guru 16770 points
Other Parts Discussed in Thread: TAS5352A, TAS5342LA

Hi

We have question about the output of TAS5352A.

Could you review the following figures?

1. TAS5342LA

2. TAS5352A

We got these results in the same board.
(It means TAS5342LA has been replaced with TAS5352A.)

PVDD=22V, Load=6ohm.
The test circuit is the reference circuit of TAS5342LA's datasheet.(2N BTL Application)

Question:
Why does the gain of TAS5352A in small signal tend to be lower than around -20dBFS?

Do you have any ideas?

Bestregards

  • 0
    TI__Guru 57800 points

    Hi, Na,

    I have asked my colleague to take a look to your questions, however, as he is traveling right now he will be able to get back to you in the next couple of days. 

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    TI__Genius 9175 points
    Hello Na,

    Since the TAS5342LA and TAS5352A are different devices, it is reasonable that the output amplitude vs frequency is slightly different. This is especially true since your dB scale is so small.

    From your data, the TAS5352A has a maximum change in output of 0.01dB which is minimal and I don’t think it should be a cause of concern.

    The reason for this is likely the difference in analog single path components between the TAS5342LA and TAS5352A. Also, all resistors and capacitors inside device will have some tolerance range and therefore, some device variation is expected.

    Best Regards,
    Matt
  • 0 in reply to Matthew Beardsworth
    Guru 16770 points

    Hi Matthew

    Thank you for your reply.

    We understood that the data we obtained is reasonable.

    Could you please give us additional comments for the following questions for TAS5352A?

    1. Can we said that the change in output of 0.01dB like our result is always expected as long as we use TAS5352A? Is it going to be changed by PVDD?

    2. If the device variations is expected, is there tendency (for TAS5352A)?

    3. We think these device variation is inherent characteristics.  So, there is no way to tune it by user (e.g. external circuit). Is it correct?

    Best Regards