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TLV320AIC3101: TLV320AIC3101 sampling rate & dual-rate mode enquiry

Leo Chow
Expert 3120 points
Part Number: TLV320AIC3101

Hi,

I have a question about the TLV320AIC3101 sampling rate : Fs(ref). In the datasheet, it mentions that the maximum sampling rate is 96 KHz. However, in page 24, the maximum that can be set for the PLL is 48 KHz. It also says that to achieve 96KHz, dual-rate mode has to be enabled. Questions :

 

1) How is dual-rate mode implemented once the register is set? Does it pass through the ADC / DAC twice? 

 

2) What kind of drawbacks can be expected from dual-rate? Does it increase the delay?

Regards,

Leo

  • 0
    TI__Mastermind 30210 points
    Hello Leo,

    1) I'm not really sure what you mean by "pass through the ADC/DAC twice" the DACs and ADCs each operate at two times Fs.
    when you configure for Dual rate mode, set it up as you would for 48khz, then enable dual rate mode, and it is set for 96khz.

    2) The TLV320AIC3101 has an AOSR and DOSR of 128 in single rate mode, however in Dual rate mode DOSR and AOSR are 64. Thus your oversampling rate is less, and because of this there may be a very slight increase for THD+N from 48 khz (datasheet spec) but I would expect these to be very minimal.

    best regards,
    -Steve Wilson