DS90UB947-Q1: Output waveform of FPD-Link III (D0+/D0-)

Ansel Song

Part Number: DS90UB947-Q1

Hi Team,

The below picture is 947 output waveform. Is this waveform correct? If it is correct, why does the first picture have a different waveform? (The center point is inconsistent). Thanks.

Best regards,

Ansel

over 4 years ago

0 Casey McCrea over 4 years ago

TI__Guru** 103215 points

Hello Ansel,

Yes this is correct because FPD-Link is a bidirectional signaling technology. The high frequency forward channel signal is getting common mode modulated by the low frequency back channel in your picture. Please watch our FPD-Link Learning center TIPL videos for more information on this topic:

https://training.ti.com/high-speed-serial-link-basics?context=1134310-1139223-1134456

https://training.ti.com/ti-precision-labs-what-is-fpd-link?context=1139747-1138099-1139854-1139837

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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DS90UB947-Q1: Output waveform of FPD-Link III (D0+/D0-)