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TLV320AIC3268: Analog input level of AIC3268

Steven Weng1
Expert 2200 points
Part Number: TLV320AIC3268

Hi Tis,

There are some questions about the analog input level of aic3268

Please help me check!

(1) There are a singled-end stereo line in(connector is phone jack) and a differential stereo line in(connector is XLR) in our product design. We wish that the line level of phone jack is consumer line level(about -10dBV, 0.316Vrms) and XLR is professional line level(about +4dBu, 1.23Vrms). Per aic3268 datasheet, the max input signal level of singled-end is 0.5Vrms and differential is 1Vrms(CM=0.9V).So it seems the consumer line level is OK but professional line level is over. If we want to support the professional line level in differential input, how could we do ?

(2) Could we choose the large input impedance such as 40Kohm to support the analog signal with higher level(>1Vrms)? With 40Kohm input impedance, the differential input level reduce 6dB before PGA mixed. So the differential signal level could up to 2Vrms. is it correct or wrong?

Thanks!

BR,

Steven

  • 0
    TI__Guru 57800 points

    Hi, Steven,

    Sorry for the delay, I was out of the office, please refer to the following comments. 

    1-You need to use a signal conditioning stage to adjust the differential line input level to the accepted levels for the 'AIC3268 input. A simple voltage divider might work. 

    2- It is not recommended to provide >1Vrms input to the device, even if selecting a higher input impedance that could attenuate the signal internally, the exposure of higher than recommended voltage to the input pins might lead to a device malfunction. 

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer