CDCM6208 device not giving clock out

Mahendra varman

Intellectual 500 points

Other Parts Discussed in Thread: CDCM6208, CDCM6208V1

We have used CDCM6208 clock buffer in our design

We have connected 25MHZ as clock input and need to configure CDCM6208 output clock as 100MHZ .

We probed input clock and we are getting 25MHz clock , but we are not getting output clock

I have attached the schematic part of CDCM6208.

Please let us know if there is any issues

Thanks

over 12 years ago

0 Matt Sunna over 12 years ago

TI__Guru* 81034 points

Hi Mahendra,

Try to connect the VDD_PRI_REF pin to 3.3V to see if this solves the problem. Also, can you tell us if you are using CDCM6208V1 or CDCM6208V2?

Best regards,

Matt

0 JacobV1587 over 12 years ago in reply to Matt Sunna

Intellectual 260 points

Hi Matt,

Here the same problem with a CDCM6208V1, pin mode, powered at 1.8V
The VDD_PRI_REF are also not powered and the XTAL gives the right frequency on SEC_REF.

Best regards,

Jacob

0 Mahendra varman over 12 years ago in reply to Matt Sunna

Intellectual 500 points

Hi Matt

Thanks for your feedback

As suggested we connected VDD_PRI_REF to 3.3V and the problem got solved.

Thanks

0 JacobV1587 over 12 years ago in reply to Mahendra varman

Intellectual 260 points

Hi Matt,

Thanks for the information, this solved also my problem.
But the solution is conflicting with the datasheet, note 2 on page 44 and 46

Thanks.

Jacob

Clock & timing

Clock & timing forum

CDCM6208 device not giving clock out