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SRC4382: No decoded

Olin Zhang
Prodigy 630 points
Part Number: SRC4382


Hi Team,

My customer designed the schematic following to the below figure from datasheet. However, it was found that the sampling rate of 192k Hz was not decoded. But if 0.1uF capacitor of TR- was changed to 1uF, it can be decoded for  the 192kHz signal. Now we need your help to confirm the following two points:

1. What is the use of  this capacitor?
2. Will there be other problems when changing to 1uf capacitor? 

Thanks!

  • 0
    TI__Mastermind 23050 points

    Hi Olin,

    These are just AC coupling capacitors to filter the DC offset from the input source and allow the line receiver inputs to bias to mid-supply. They should not significantly impact your signal, though it is recommended to use C0G or X7R capacitors. Generally these two capacitors should be the same value to preserve common-mode rejection and maintain matching on the inputs. If there are issues operating at 192kHz then there may be reflections on the line from improper matching. Is the input source truly a 75 unbalanced source?

    Best,

    Zak