LMK5B33414: LMK5B33414 outputs 312.5M clock accuracy confirmation

Ying Zhou

Part Number: LMK5B33414

Tool/software:

Hi team,

This is post on customer's behalf.

LMK5B33414 XO input 48MHZ (±50ppm), IN0 input 25MHZ (±10ppm), LMK5B33414 operation jitter attenuation contempt, OUT0 output 312.5M clock, 312.5M clock accuracy ±50ppm? Or ±10 ppm? How we calculate it?

Regards，

Lydia

2 months ago

0 Jennifer Bernal 2 months ago

TI__Genius 16495 points

Hy Lydia,

Based on your setup, when the DPLL is locked, the outputs have the accuracy of the IN0 input (10 ppm) and when the DPLL is unlocked, the outputs have the accuracy of the XO input (50 ppm).

Regards,

Jennifer

0 Ying Zhou 1 month ago in reply to Jennifer Bernal

TI__Expert 5385 points

Hi Jennifer,

Thanks for your support.

There is customer's response, please support further , thank you so much.

Are there any references?

Regards，

Lydia

0 Jennifer Bernal 1 month ago in reply to Ying Zhou

TI__Genius 16495 points

Hi Lydia,

I don't follow the question. Are you asking for further documentation?

Regards,
Jennifer

0 Ying Zhou 1 month ago in reply to Jennifer Bernal

TI__Expert 5385 points

Hi Jennifer,

Thanks for your support.

There is customer's response, please support further , thank you so much.

Does any article analyze whether the clock accuracy after DPLL LOCK is 10ppm?

Regards，

Lydia

0 Jennifer Bernal 1 month ago in reply to Ying Zhou

TI__Genius 16495 points

Hi Lydia,

The datasheet explains this in Section 8.2.2 DPLL.

When DPLL operation is enabled and the DPLL is locked, the DPLL reference inputs (INx pins) determine the frequency stability and accuracy of the output clocks. The clock source on the XO pin determines the free-run and holdover frequency stability and accuracy of the output clocks. The VCBO determines the BAW APLL output clock phase noise and jitter performance over the 12kHz to 20MHz integration band, regardless of the frequency and jitter of the XO pin input.

Regards,

Jennifer

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LMK5B33414: LMK5B33414 outputs 312.5M clock accuracy confirmation