DS90UH927Q serializer output level issue

chen fan

Hi,

I'm using DS90UH727Q FPD-link III serializer for LVDS video transmittion on automotive. In datasheet it says the different output level of the serializer is 800-1200mv Vp-p.

We are conducting EMC test and the LVDS signal was seriously influnced by the radiated megnatic emitting and the screen flashed.

Is it possible to improve the output level of serializer or does it has any pre-emphasis function? I didn't find this in datasheet.

Regards

10 年多前

0 Ted Xu 10 年多前

TI__Intellectual 1050 points

Hi Fan

UH927的输出是CML信号，不支持去加重功能。高速信号的长距离传输依靠接收端的自动EQ功能。

附件TI关于PCB laoyut相关的建议，希望对你的问题有所帮助。

http://www.deyisupport.com/cfs-file.ashx/__key/communityserver-discussions-components-files/59/4682.PCB-layout-_2600_-cable-_2600_connector.pdf

0 chen fan 10 年多前回复 Ted Xu

Prodigy 20 points

Hi Ted,

Thanks for your help.

From 1.2G-1.4G radiated emitting test, the screen flashed at these two points

1394Mhz above 269V/m

1400Mhz above 376V/m

Do you have any failure experience of this frequency range?

Regards

0 Roman Wang 10 年多前回复 chen fan

TI__Intellectual 2240 points

你好，

看起来是你的系统地1394和1400两个频点上超过了EMI的spec.

可以打全SSCG功能，理论上会下降。

另外适合将PCLK作一些改变，也会有一些改善。

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DS90UH927Q serializer output level issue

http://www.deyisupport.com/cfs-file.ashx/__key/communityserver-discussions-components-files/59/4682.PCB-layout-_2600_-cable-_2600_connector.pdf