GPS Synced Clock

Kyle Aven

Other Parts Discussed in Thread: CDCE72010

Hello,

I am in need of a circuit that can create a GPS synced ADC clock from the PPS of the GPS. Any suggestions on where to start?

thanks

Kyle

over 13 years ago

0 Fritz over 13 years ago

TI__Expert 4150 points

Hi Kyle,

what's the output frequency of your GPS? Can you get anything faster than a PPS from it?

BR. Fritz

0 Kyle Aven over 13 years ago in reply to Fritz

Intellectual 950 points

No. Only thing we get from GPS is PPS line and NEMA info. There is a chip on the market that does this, AD9548, but it is way too much overkill for our application.

0 Fritz over 13 years ago in reply to Kyle Aven

TI__Expert 4150 points

Hi, we have a number of clock generators that can go into a jitter cleaning mode but they are all based on an analog PLL. Therefore, you would need a loop BW of 100mHz or less. We do have customers implementing this in an analog fashion (e.g. CDCE72010), but obviously it requires a very large capacitance, which is not easily achieved. I will ask around if any of my coworkers have a suggestion. BR. Fritz

0 Dean Banerjee over 13 years ago

TI__Mastermind 28011 points

Kyle,

For the GPS synced signal (like. IEEE 1588 standard), a digital PLL is probably the best approach. In the LMKxxxx series of clocking devices, we have nothing that could do this.

Clock & timing

Clock & timing forum

GPS Synced Clock