Twisted Pair input routing on PCB

[FreshmanNewbie]

I have a twisted pair input to the IN+ and IN- pins of the MAX9278 deserializers.

The Parallel data output of the deserializer consists of 4 LVDS data channels and 1 LVDS Clock channel to a 3.1" TFT whose Pixel Clock is calculated to be as 27MHz.

So, I guess the twisted pair inputs IN+ and IN- would also be 27MHz. Am I correct is assuming so?

In that case, what impedance should be maintained between the IN+ and IN- twisted pair input signals to the deserializer? Should I maintain the 100ohms impedance just like if it was a coax input or what should I do?

 

[barry]

1) If you've got a serial input and a parallel output, why would you expect the same data rate? And the clock output looks like it's actually one-fourth the data rate. (Not sure how this chip works)
2) The impedance of the cable has nothing to do with the frequency. If you've got a 100 ohm medium, it's 100 ohm.

 

[KlausST]

Hi,

I guees the data rate / frequency is not determined by the receiver...thus I recommend to read the transmitter's specification.

If I'm not mistaken then you did not take color depth into account with your datarate calculation.

Klaus

 

[FvM]

Did you notice the datasheet headline? It says 3.12 Gbps.