CDCM6208: Unused output termination & internal component changing

Madhu Sharma

Part Number: CDCM6208

Hi,

I am using CDCM6208V1 in Pin mode ( Pin mode 19). Also I am planning to use SEC_REF as the input.

Please clarify below queries:

1) Out of 8 outputs, we are not using two 25MHz outputs ( Y5 and Y6 LVDS outputs). Please let me know how to terminate these two outputs.

Whether connecting a 100 ohm resistor across the differential pins is a good option?

2) In table 8 of datasheet, Inter LPF component values are suggested. Please let me know how to change these values in Pin mode.

Regards,

Madhu.

0 Puneet Sareen over 8 years ago

Hi Madhu

1> You should terminate the unused LVDS outputs with 100 resistor across the differential pins.

2> Please see the attached document for the LPF values in the pin modes.

Best regards

Puneet

0 Madhu Sharma over 8 years ago in reply to Puneet Sareen

Expert 2915 points

Hi Puneet,

Thanks for the reply.

For any specific pin value, whether the internal LPF values ( as specified in the table shared table) will set automatically?

Regards,

Madhu

0 Puneet Sareen over 8 years ago in reply to Madhu Sharma

Hi Madhu

Yes, the internal loop filter values will be automatically set for a specific pin configuration as specified in the table.

Best regards

Puneet

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