SN75LVDS83B: Clarify if the schematic is OK

Hello Kamesh,

Thanks for reaching out - we will take a look at your request first thing next week and provide a timeline for when we can get back to you 

Best Regards,

Casey 

Hi Kamesh,

I'll review this and get back to you by next Monday!

Thanks,

Lysny

Thanks Lysny

Hi Kamesh,

Here are my comments:

1. Make sure that the differential impedance on the LVDS outputs are 100 Ohm.

2. Add another 0.1uF and 10nF cap to ground for the PLLVCC pin. This set should be placed close to the PLLVCC pin, and the existing set should be placed closet to the LVDSVCC pin on the PCB design.

Let me know if you have any further questions.

Thanks,

Lysny

Hi Lysny,

Thanks for your response.

We tried that last week and we are still not able to get the display going. I am sure we are missing something basic. Currently our schematic is setup in such a way that the SN75LVDS IC receives the RGB data from an STM32H7 uC.

Is it possible for us to have a short call to clarify this issue.

I will try to connect with you on the messenger.

Thanks in advance,

Kamesh

Kamesh,

Prior to a call, can you please give some detail on exactly what issue you are seeing? Can you verify the PCLK input and RGB pins from the STM32H7 are coming in as expected? What is the PCLK frequency? 

Can you also share detail on the display? Maybe a datasheet for the display which we can review?

Best Regards,

Casey