DS90UB964-Q1: impedance issue for DS90UB964

Jason Chien42

Dear Sir:

Due to datasheet of DS90UB964 suggest 100Ω differential characteristic impedance and 50Ω single-ended characteristic impedance for +(-) RIN and CSI traces , It mean chip to capacitor(such as green line) or chip to connector?

Jason

over 7 years ago

0 Palaniappan Manickam over 7 years ago

TI__Genius 10475 points

Hello,
The impedance should be maintained at 50 ohm or 100 ohm all the way from through the connector, not just the green box.

0 Jason Chien42 over 7 years ago in reply to Palaniappan Manickam

Expert 1180 points

Dear Sir:

If we want to reserve single end and differential compatible for RIN , How to design they trace? 50ohm or 100ohm? BTW , How to design GND trace of single end RIN? 50ohm , too?

Best Regard

Jason

0 Steven(Shenzhen) Shi over 7 years ago in reply to Jason Chien42

TI__Mastermind 30515 points

Jason,

I think I'm confused by your issue. please keep in mind that the impedance matching is very important for high speed link design, you can refer to the book "LVDS owner" in TI website.

also, you can refer to UB914A EVM board design, which has the compatible design between single (coax application) and diff. signals (STP).

best regards,

Steven

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DS90UB964-Q1: impedance issue for DS90UB964