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HMC7043 Eval Board LVDS vs LVPECL

Question asked by jnet on Jun 23, 2017
Latest reply on Jul 7, 2017 by kpeker

I am noticing with the HMC7043 eval board the following behavior:

* configure a channel (e.g. channel 3) for pulse mode (start up mode dynamic, LVPECL output, mute selection logic 0, dynamic output buffer disabled)

* enable the channel

* observe the channel output (n and p differential pair) on a scope (p is 1.36 V, n is 2.17 V)

* disable the channel

*  n voltage goes to 0, p voltage goes to 0

 

If  I repeat this with the channel in LVDS mode instead of LVPECL mode, the n and p signals both remain at 0 V regardless of whether I enable or disable the channel.

 

Can you explain the difference in behavior between the two modes?

 

Thanks!

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