TUSB9261: Oscillator Jitter spec

Kurumi Hasegawa

Part Number: TUSB9261

Hi team,

Related to the previous post, I’m still looking for oscillator that can meet the specs listed in section 6.8 of the TUSB9261 datasheet. But most of the oscillator’s datasheet does not state jitter parameter Tp-p. Would you please advice how to determine oscillator’s jitter? Is it possible to estimate from another parameter? How do we usually chose which oscillator to use?

Best regards,

Kurumi

over 2 years ago

0 Nicholaus_Malone over 2 years ago

TI__Mastermind 27925 points

Hi Kurumi,

The safest choice is usually the one that is present in one of our reference designs or EVMs. Unfortunately, I don't see the crystal used in the TUSB9261DEMO EVM; however, you can still refer the TID-00882 reference design.

Crystal: ECS-400-20-33-TR

Regards,

Nicholaus

0 Kurumi Hasegawa over 2 years ago in reply to Nicholaus_Malone

TI__Expert 7991 points

Hi Nicholaus,

ECS-400-20-33-TR is crystal, but we are looking for oscillator. I believe it is different type of component.

How do we usually pick which oscillator to use, when there is jitter requirement?

Best regards,

Kurumi

0 Nicholaus_Malone over 2 years ago in reply to Kurumi Hasegawa

TI__Mastermind 27925 points

Hi Kurumi,

My mistake. I don't believe we have tested an oscillator. However, the oscillator spec list is in the datasheet. If a TI oscillator is being used, then it would be best to ask about that oscillator to see if it meets the jitter specs listed in the TUSB9261 datasheet as they would have more expertise on the subject. Otherwise, you'll need to ask the manufacturer of the oscillator.

The total jitter spec int the total jitter should be less than 25 ps, the random jitter should be less than 0.8ps and the peak-to-peak jitter should be less than 50ps.

Regards,

Nicholaus

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TUSB9261: Oscillator Jitter spec