DS125DF410 - How to change loop bandwidth of the CDR

Kawai

Guru 19785 points

Hello Team,

Could you please tell us how to change the loop bandwidth of the CDR PLL ? Our customer is willing to change it due to their application.

I believe the following register changes the charge pump current of the PLL which could change the loop bandwidth.

- REG 0x0A [6] : IDAC override bit
- REG 0x1C [7:2] : IDAC_PD/FD_CPx

Is there any other register which is effective ?

Best Regards,

Kawai

over 10 years ago

0 Rodrigo Natal over 10 years ago

TI__Mastermind 19235 points

Hi Kawai. Yes, these are the relevant registers. I would advise that, to the extent that customer changes the PLL charge pump settings from their default values, retimer performance per datasheet may not be guaranteed.

Rodrigo

0 Kawai over 10 years ago in reply to Rodrigo Natal

Guru 19785 points

Hello Rodrigo-san,

Is there any other registers which could control the loop bandwidth ?

Best Regards,
Kawai

0 Rodrigo Natal over 10 years ago in reply to Kawai

TI__Mastermind 19235 points

Hi Kawai-san. No other registers.

Regards,

Rodrigo Natal

DPS Applications Engineer

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DS125DF410 - How to change loop bandwidth of the CDR