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Hello,
I am using CDCLVD1216 to drive my TTL signal to fanout to 16 LVDS receivers.
But i am seeing a lot of reflections on LVDS output.
May i know the possible root cause. Can CDCLVD1216 drive 13" PCB microstrip line and 12 feet cable. Kindly let me know.
Thanks,
Muni
Hi Muni,
Yes, it can drive a 12 foot transmission line. I recommend to use the CDCLVD1216 IBIS model to simulate driving your transmission lines of desired length and plot the signal integrity. This is a way to determine whether the device can meet your requirements.
It is recommended to design the output PCB traces with controlled differential impedance of 100 ohms to match the 100 ohm load termination. The 12 foot coax cable should be a matched pair with controlled impedance of 50ohms.
Kind regards,
Lane
Hello Lane Boyd,
Thanks for your response.
Can I get the board file for "cdclvd1212evm".
I would like to follow some guidelines for differential output traces. First revision board failed. We would like to correct the layout.
Can I contact any application engineer in India for evaluation board support. Could you please direct me.
Thanks,
muni
Hi muni,
Attached is the *.brd file. cco-evm-lvd1212-01.brd
You may find these app notes helpful:
Some general PCB layout guidance for high speed traces:
Do you have a local/regional FAE that you typically work with?
Kind regards,
Lane