• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 30 subscribers
  • Views 470 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TAS5631B distortion figures

geert de vries
Intellectual 600 points
Other Parts Discussed in Thread: TAS5631B, TAS5162, TAS5631

Hi all,

Since 2 years we manufacture an eight channel amplifier unit using 4 pcs TAS5631B on one board. In general, specifications are ok and reliability is no issue either. However a strange phenomenon appears during production tests, specifically at THD vs freq sweeps.

In general distortion figures are low, however the odd channels have allways lower distortion figures than the even channels. There is allways one odd and one even channel in the same chip. Sometimes, one channel may have 10dB worst distortion than the others, but after a powercycle this might be changed to an other channel. A new version of the childrens game  "who will take the chair" obviously. An almost identical board with TAS5162 does not exhibit this strange behaviour.

Could it be that this has to do with the re-sampling that occurs inside the TAS5631B?

regards

Geert de Vries

  • 0
    TI__Guru 57800 points

    Hi Geert,

    Have you verified that the signal of the amplifier's inputs is the same for both channels used?, this way we can discard any issue related to the PWM processor. After a power cycle, the issue transfers to other TAS5631 in the same channel, or it changes to the other channel of the same amplifier?

     Regards,

      -Diego Meléndez López
       Audio Applications Engineer