CDCLVP1204: Random additive jiiter data for fout = 25MHz

JH Shin

Guru 11480 points

Part Number: CDCLVP1204
Other Parts Discussed in Thread: , LMK00304

Hello,

Could you please provide the random additive jiiter data for fout = 25MHz ?

The CDCLVP1204 data sheet contains only the random additive jitter data for fout=100MHz or higher.

Thanks.

0 Vibhu Vanjari over 5 years ago

Hello JH,

We may not have data collected for every possible frequency. That said I would expect the additive jitter to be around 100 fs.

If you can provide the target you want to hit, we may be able to provide a better answer on whether it is possible.

Keep in mind the jitter will also depend significantly on how clean the input reference is as well.

I would also consider evaluating the device further using the CDCLVP1204EVM with your specific input source.

Thanks,

Vibhu

0 JH Shin over 5 years ago in reply to Vibhu Vanjari

Guru 11480 points

Hello Vibhu,

Thank you for your reply.

My customer is looking for 1:4 LVPECL clock buffer with an additive jitter of <80 fs at 25MHz.

Could you please recommend a suitable device ?

The clock buffer datasheets I found do not contain the additive jitter charaterstics for 25MHz.

Thank you.

0 Vibhu Vanjari over 5 years ago in reply to JH Shin

Hello JH,

There are two devices that I recommend for this application. CDCLVP1204 and LMK00304.

In either case I do not think you can meet < 80 fs at 25 MHz, assuming your jitter integration bandwidth is 12 kHz-20 MHz.

Both these devices have additive jitter of ~ 80 fs at 100 MHz input frequency. The jitter is expected to be higher for a lower input frequency.

Thanks,

Vibhu

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