DS90UB948-Q1: schematic review

Betty Guo

Expert 7300 points

Part Number: DS90UB948-Q1

Hi team,

could you help to review the schematic about DS90UB948-Q1. Thanks in advance.

ds90ub948-q1电路.pdf

over 5 years ago

0 Charley Cai over 5 years ago

TI__Genius 12866 points

Hi Betty,

I will review the file and get back to you in 3 days.

Best Regards,

Charley Cai

0 Charley Cai over 5 years ago in reply to Charley Cai

TI__Genius 12866 points

Hi Betty,

1. The Ser side and Des side AC caps need to have the same value. Please make sure the Ser side uses 33nF cap as well.

2. The device is a 948 with OLDI output but has CSI output pin names. Please make sure these names are corrected.

3. Please follow datasheet Typical Connection Diagram on selecting the power decoupling cap values.

4. Please use 10uF cap on PDB Pin.

5. Please make sure the OLDI outputs +/- pairs are terminated with 100ohm at the display side.

Best Regards,

Charley Cai

0 Betty Guo over 5 years ago in reply to Charley Cai

TI__Expert 7300 points

thanks Charley,

customer have update the schematic, please help check it again. thank you.

DS90UB948-Q1电路图20201020.pdf

0 Charley Cai over 5 years ago in reply to Betty Guo

TI__Genius 12866 points

Hi Betty,

Do you know why they have LL3, LL5 and also has LL13 and LL14? The schematic is ok but this may create layout challenges. They would need to ensure the stub is minimize at the joint point between the two LLs.

Best Regards,

Charley Cai

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DS90UB948-Q1: schematic review