Power over coax can we use normal connector header for DOUT line

[newbie_hs]

The below image is taken from DS90UB913A-CXEVM Serializer Board Schematic. T he complete schematic is on page 21.

My question is given below

1. Do we need 50 Ohm connectors for DOUT0+ and DOUT0-
2. or can I use connectors like this.

If 50 Ohm connectors are mandatory means, I need to make a lot of changes in my existing board.

 

[D.A.(Tony)Stewart]

I see no reason to use 50 ohm connectors but what impedance will the output be ?

 

[newbie_hs]

DOUT+ and DOUT- are 100 Ohm differential lines.

 

[dick_freebird]

Why are you using coax instead of 100-ohm shielded
twisted pair? Look at Ethernet. Nothing fancy, pins and
wires. Might think about USB-C, cabling is light and cheap
if it's short haul and you own both ends. I'm sure you can
find connectors.

 

[newbie_hs]

I will definitely think of 100-ohm shielded twisted pair.
Can I use normal connector

 

[dick_freebird]

Preferably. But there are many "normal" standards now.
Data rate, noise immunity, distance, cost are all in play.
Priorities and values, choices and consequences are on you.

 

[newbie_hs]

All the connectors I found with 50 Ohm impedance are SMA type only.
I need more pins

 

[FvM]

Serializer data rate is > 1 Gbit/s. Cable and connector must be suited for it.

 

[KlausST]

Hi,

are you aware that the bit rate over these lines may be up to 1.4 GBit/s?

I see quite a good reason for using proper PCB layout, proper connectors, proper cables and proper termination.

Klaus

added:
FvM was just a couple of minutes ahead.... while I was reading your datasheet...

 

[D.A.(Tony)Stewart]

I just read BW is 700 MHz so the values and ratio of inductance / capacitance ratio times length must be factored into eye pattern distortion. That means Zo=sqrt{L/C} or L/C = 100^2 or <10% lambda.

You better verify performance with a suitable tester such as VNA or 1GHz DSO with 100 Ohm STP or UTP. You may find crosstalk demands you include an SMD CM choke.

The schematic shows DNP for their connector not yours which will/may have crosstalk.

 

[newbie_hs]

Decided to go with this connector.