LMX2820: Synchronization for 16 units

David Park

Expert 5800 points

Part Number: LMX2820

Tool/software:

Hi,

Could you guide for below issue?

Customer would like to make phase matching of 16 units of LMX2820.

They referred below 2 links and tried it with PSYNC.

https://www.ti.com/lit/pdf/snau273

https://e2e.ti.com/support/clock-timing-group/clock-and-timing/f/clock-timing-forum/1097665/lmx2820-phase-synchronization-of-multiple-lmx2820-s

But it's still not matched with following SYNC cat condition in the document.

Please provide any guidance or any additional document.

Condition is as below.

- 9.75GHz~21.75GHz

- 100MHz Reference

- PW 60ms PSYNC(tried with changing PW)

Thanks.

1 month ago

0 vicente flores prado 1 month ago

TI__Genius 17361 points

Hello David,

Are you following the directions for a CAT3 sync? Cat3 sync pulses are time critical as well.

Regards,

Vicente

0 HASEUNG RYU 1 month ago in reply to vicente flores prado

Prodigy 20 points

Hello.

All instructions for CAT 3 sync written in the document have been applied and tested.

Can I get a test setup or related data for the frequency band??

I don't know what conditions we're missing.

Thanks.

0 Noel Fung 1 month ago in reply to HASEUNG RYU

TI__Guru* 88930 points

Hi Haseung,

The user's guide, snau273, already has examples with configuration and setup.

Do you have their test data and configuration?

0 HASEUNG RYU 1 month ago in reply to Noel Fung

Prodigy 20 points

I have already conducted the test with the setting shown in snau273.

However, it was confirmed that the PSYNC function did not work well in the higher frequency band.
I would like to receive the test results of the frequency band higher than 6010 MHz.

Thanks.

+1 Noel Fung 1 month ago in reply to HASEUNG RYU

TI__Guru* 88930 points

Hi Haseung,

Was the customer able to sync at 6010MHz? If so, can they try to sync at 6020MHz?

Could you provide the customer's test data and configuration? This will help us identify the problem.

0 David Park 1 month ago in reply to Noel Fung

TI__Expert 5800 points

Hi Noel,

Haseung is customer.

Test data and configuration is confidential so I'll share them soon through the mail.

Thanks.

0 Noel Fung 1 month ago in reply to David Park

TI__Guru* 88930 points

Hi David,

Ok, let's take this offline.

Clock & timing

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LMX2820: Synchronization for 16 units