TDA4VM: TDA4 serdes REFCLK

Hi TI:

We have some problem about CDCE6214 application in TDA4.

1.Is it must be have 50ohm to gnd between TDA4 and CDCE6214 100MHz clock? We can see it is must be have in ref design and datasheet based on CDCI6214.But it is not must have 50ohm to gnd at LP-HCSL mode in CDCE6214 datasheet.

2.The TDA4 require software close the internal  termination before the ref clk is good,when the ref clk vpp is bigger than 400mV.(And that CDCE6214 ref clk vpp is always bigger than 400mV whether in  LP-HCSL mode or  LVDS mode.)So, the software need to close the internal  termination and the TDA4 need to add external 50ohm to gnd in ref clk.Is that correct?Is it must be conterl the  CDCE6214 not output ref clk in TDA4 power on?

3.Is the  CDCE6214 work in LP-HCSL mode or  LVDS mode with the TDA4?And is the ref clk need to have series AC capacitance when  CDCE6214 work in LVDS mode ?

4.Is the function of series 30ohm and 50ohm to gnd between TDA4 and CDCI6214 100MHz clock in the tda4 ref design?

5.Do you have some design suggest about the TDA4  with CDCE6214?

Thanks!!