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SN75LVDS84A: is the right part number to replace DS90C363B?

Uilter Witte
Prodigy 20 points
Part Number: SN75LVDS84A
Other Parts Discussed in Thread: DS90C363B,

Hi,

Due to semicondutor shortage, I had no options to buy the current RBG->LVDS transmitter that I use in my project (DS90C363B).
I saw in the documentation the directly substitute for this item is the SN75LVDS84A.

We buy the SN75LVDS84A and replace it in two board to test.
After replacement, the image was blurred. The figure below shows the effect.

https://drive.google.com/file/d/1dXDonz65ia6J9oOjhS794t0J3Whk8OQH/view?usp=sharing

This is the schematic of my project (in my drive to high definition):

https://drive.google.com/file/d/1WS5uKoryP8dJHPqnXt-YchGFSI1VgcgL/view?usp=sharing

The CLOCK of the display is 50MHz (Typ.).

We try to remove the R600, left the pin 14 not connect, like the datasheet recommended, but nothing changes.

I appreciate any help with it.

Thanks!

  • 0
    TI__Guru** 103195 points

    Hello Uilter,

    The DS90C363B has an option to set rising or falling edge strobe for the input data using pin 14, but the SN75LVDS84A does not. The SN75LVDS84A always uses falling edge strobe. 

    Based on your schematic it looks like the design was tying pin 14 high which sets rising edge strobe. So most likely the data coming from the RGB source is clocked out on rising edge but the SN75LVDS84A is expecting falling edge. That would explain why you are getting video issues. 

    Can you check to see if the source can be adjusted to clock out data on falling edge instead of rising?

    Best Regards,

    Casey 

  • 0 in reply to Casey McCrea
    Prodigy 20 points

    Casey, thanks for your reply.

    I'll check with the team and let you know ASAP.

    Thanks in advanced.