CDCM6208: LVPECL output matching network

Intellectual 1900 points

Lacey Lin

Part Number: CDCM6208

Hi team,

For the LVPECL output, does the CDCM6208 only support the AC coupling?

If I use the DC coupling to connect the CDCM6208 output to a LVPECL receiver, will this cause issue?

Lacey

Thanks a lot!

Expert 5210 points

Lane Boyd
- Dec 5, 2018 8:55 PM
Hi Lacey,

Yes, the output only supports AC-coupling for LVDS or LVPECL outputs. DC coupling can cause issues.

Kind regards,
Lane
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Intellectual 1900 points

Lacey Lin
- Dec 6, 2018 3:12 PM
In reply to Lane Boyd:
Hi Lane，
Can you help to share the detail structure or reason for why the DC coupling will cause issue?
And what's the issue?
Customer need the detail information to evaluate the solution.
Lacey
Thanks a lot!
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Expert 4330 points

Madhu Balasubramanian
- Dec 7, 2018 3:14 AM
In reply to Lacey Lin:
Hi Lacey, there is no device issue with DC coupling but we need to recommend the right interface if customer prefer to DC couple in order to support both the output common mode voltage for CDCM6208 as well as the input common mode voltage for the LVPECL receiver. Can you share the specifications of the LVPECL receiver, like Vicm, Vid etc so that we can look into the correct recommendation. AC coupling will always be the easiest.
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Intellectual 1900 points

Lacey Lin
- Dec 7, 2018 7:10 AM
In reply to Madhu Balasubramanian:
Hi Madhu，
For my understanding, the CDCM6208 can support DC LVPECL, because the common mode voltage of the CDCM6208 in LVPECL-Like is not the same as the standard LVPECL. right?
So what's the common mode voltage of CDCM6208 in the LVPECL-Like output?
Customer said they need to double check with the receiver vendor to make sure the LVPECL receiver specs.
Lacey
Thanks a lot!
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Expert 6155 points

Shawn Han
- Dec 11, 2018 5:50 AM
In reply to Lacey Lin:

Hi Lacey,

Datasheet shows it as below. Notice it is a CML driver internal for this LVPECL-like output.

Best Regards,

Shawn
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CDCM6208: LVPECL output matching network

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