LMK03001C Lock-up Time

Sadanori Kato

Hi,

We have obtained a question from our customers.
Could you please tell us lock-up time of LMK03001C?
If we can obtain the reference value of lock-up time that you evaluated, it is OK.
In addition, please also tell us your evaluation conditions as soon as possible.
For example, they are reference clock frequency, output clock frequency, vco frequency,
Kvco, feedfoward divider setting, feedback divider setting, output divider setting,
PDF frequency, charge-pump current, loop filter resistors and capacitors
(figure 8-2. Loop Filter on the 29page in data sheet), etc.

Best Regards,
Kato

over 12 years ago

0 Sadanori Kato over 12 years ago

Guru 36540 points

Hi,

We have not received a reply from you yet.
Please advise us as soon as possible.

Best Regards,
Kato

0 Timothy T over 12 years ago in reply to Sadanori Kato

TI__Mastermind 28560 points

Hello,

I hope the following info can help:

Note that in the equations above, the analog lock time can take longer depending on the definition of in lock. For instance lock time would be different for lock to +/- 1000 ppm vs. +/- 1 ppm.

Here is a table which shows some data which illustrates how lock time various with primarily the phase detector frequency.

OSCin	Fpd	Lock Time
10 MHz	1 MHz	800 us
20 MHz	2 MHz	400 us
10 MHz	100 kHz	2.9 ms
10 MHz	10 kHz	21 ms
20 MHz	200 kHz	1.4 ms
10 MHz	200 kHz	2.1 ms

73,

Timothy

0 Sadanori Kato over 12 years ago in reply to Timothy T

Guru 36540 points

Hi, Timothy-san,

Thank you for your information.
We have a additional request to you.
Could you send the application notes the formula of lock-up time is described?
In additon, please explain the process of calculation of the table to us as soon as possible.

Best Regards,
Kato

0 Timothy T over 12 years ago in reply to Sadanori Kato

TI__Mastermind 28560 points

The table was collected data, there wasn't much application info with the equation - it was simply an attempt to model collected data.

73,

Timothy

0 Sadanori Kato over 12 years ago in reply to Timothy T

Guru 36540 points

Hi, Timothy-san,

Thank you for your cooperation.
We have one more request.
For example, do you have a output waveform of lock-up time?
If you have it, please send us it, tell us evaluation conditions.

Best Regards,
Kato

Clock & timing

Clock & timing forum

LMK03001C Lock-up Time