SRC4392: Receiver ASRC frequency response

Fred A

Prodigy 10 points

Part Number: SRC4392

We are currently using SRC4392 into our design, andwe have an issue with the frequency response of SRC4392.

SRC4392 is used with the following configuration

DIR -> ASRC -> PORTb
Slave mode, LRClk=192kHz, BClk=12.288MHz, MClk=24.576MHz
Input sampling frequency 192kHz

If we disable the ASRC with synchronised frequencies, the frequency response is flat.

If we use ASRC, we have following :

In datasheet p5, we have digital interpolation filter ripple +/- 0.007dB max and digital decimation filter ripple +/-0.008dB max.

How were these figures measured?

1 month ago

+1 Arash Loloee 1 month ago

TI__Mastermind 32341 points

Hello Fred,

I checked with validation team and the answer was that this ripple is not actually measured but simulated , since this is internal to the device and related to digital process so they simulate it during design phase.

Kind Regards,

Arash

0 Fred A 1 month ago in reply to Arash Loloee

Prodigy 10 points

In my application, this measured ripple strongly degrades my system.

If it was simulated, in which configuration (values in registers) coud I get the same values?

0 Arash Loloee 1 month ago in reply to Fred A

TI__Mastermind 32341 points

Hi Fred, From what I was told, the value is coming from simulation of the filter itself during design phase (schematic and simulation ) and it desponds on the process ( technology) being used for the fabrication of the device.

Kind Regards,

Arash

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SRC4392: Receiver ASRC frequency response