DS90UB964-Q1: DS90UB964-Q1 Eye diagram

Ben Shih

Expert 1220 points

Part Number: DS90UB964-Q1
Other Parts Discussed in Thread: ALP, USB2ANY

Eye diagram is shown in the photo does not look very good, is there any suggestions?

Eye height below 600mv is the normal range, right? (Based on 100ohm)

over 5 years ago

0 Ben Shih over 5 years ago

Expert 1220 points

0 Ben Shih over 5 years ago in reply to Ben Shih

Expert 1220 points

Update~

I refer to TI 964 EVM circuit diagram and have the following problems:

1. Should R78 and C84 be changed to unmount? I think other suggested routes are not loaded.

2. Is it necessary to change R74 to 49.9ohm?

Will the above affect the eye diagram?

Is there anything else that needs to be updated?
I currently follow TI 964 EVB SCH.
www.ti.com/.../snlu177.pdf. com.tw%252F

0 Jiashow Ho over 5 years ago in reply to Ben Shih

TI__Genius 11340 points

Hi Ben,

What type and length of cable are you using? How are you measuring the eye? Are you seeing lock issues? I suggest looking at the eye diagram from the CMLOUT pins.

I would suggest leaving R78 and C84 DPN and changing R78 to 49.9ohm.

Best,

Jiashow

0 Ben Shih over 5 years ago in reply to Jiashow Ho

Expert 1220 points

My measurement point is CMLOUT pin, this is the value after EQ, and this is using 15m cable, do you have any other suggestions? Will these values affect the eye?

0 Jiashow Ho over 5 years ago in reply to Ben Shih

TI__Genius 11340 points

Hi Ben,

Can you run the margin analysis tool on the 964? Have you tried a different/ shorter cable?

Best,

Jiashow

0 Ben Shih over 5 years ago in reply to Jiashow Ho

Expert 1220 points

I don’t have this development board in my hand. In addition, I tested the 10/15m dynamics in the same way. Are there any other suggestions? Regarding the quality of the eye diagram? What might affect it?

0 Ben Shih over 5 years ago in reply to Jiashow Ho

Expert 1220 points

Is "margin analysis" as the criterion?

0 Ben Shih over 5 years ago in reply to Ben Shih

Expert 1220 points

Can I apply for the "LaunchPad™ Development Kit"? Or is it borrowed or needs to be purchased?

0 Jiashow Ho over 5 years ago in reply to Ben Shih

TI__Genius 11340 points

Hi Ben,

The Analog LaunchPad is a free software you can download here: https://www.ti.com/tool/ALP

Best,

Jiashow

0 Ben Shih over 5 years ago in reply to Jiashow Ho

Expert 1220 points

hi Jiashow,

I do not have demo board can use it? it seems to MCU control?

0 Jiashow Ho over 5 years ago in reply to Ben Shih

TI__Genius 11340 points

Hi Ben,

The Margin Analysis tool (https://www.ti.com/lit/ug/snlu243/snlu243.pdf?ts=1595341459548&ref_url=https%253A%252F%252Fwww.google.com%252F) can be used on all the systems with ALP.

Could you also clarify your issues? Are you seeing lock instability? What type of 15m cable are you using? Do you have the insertion / return loss data of the cable?

Best,

Jiashow

0 Ben Shih over 5 years ago in reply to Jiashow Ho

Expert 1220 points

Two questions for you:

1. As shown in the figure, I open "Analog LaunchPAD AP" and it will detect EVM. How do I connect to my TI 964 system?

2. I tested two lengths: 2M: No problem ; 10M/15M:Burning for a long time may have FPS drop problems.

Do you have any suggestions?

0 Ben Shih over 5 years ago in reply to Ben Shih

Expert 1220 points

hi Jiashow,

Can we use USB to I2C to connect to TI 964? (on my system side)

0 Jiashow Ho over 5 years ago in reply to Ben Shih

TI__Genius 11340 points

Hello,

Do you have a USB2ANY(https://www.ti.com/tool/USB2ANY) or Aardvark? You can use those to interact with our ALP.

Do you have the insertion loss data for the cable?

0 Ben Shih over 5 years ago in reply to Jiashow Ho

Expert 1220 points

Can any USB to I2C solution be used? Or are they bound to specific chips?

Is this ok?

I will confirm the CABLE loss issue.

0 Ben Shih over 5 years ago in reply to Ben Shih

Expert 1220 points

Update Insertion loss report

Do you have any suggestions?

0 Jiashow Ho over 5 years ago in reply to Ben Shih

TI__Genius 11340 points

Hi Ben,

What does the RESULT mean? -13.57db insertion loss at 3GHz? Is there a plot over frequencies?

Best,

Jiashow

0 Ben Shih over 5 years ago in reply to Jiashow Ho

Expert 1220 points

Can any USB to I2C solution be used? Or are they bound to specific chips?

Is this ok?

https://www.microchip.com/wwwproducts/en/MCP2221

0 Casey McCrea over 5 years ago in reply to Ben Shih

TI__Guru** 103215 points

Hello Ben,

Only USB2ANY or Aardvark have been qualified for running the GUI

Best Regards,

Casey

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DS90UB964-Q1: DS90UB964-Q1 Eye diagram