DS90UR910-Q1 Datasheet, PDF (31/34 Pages) Texas Instruments – 10 - 75 MHz 24-bit Color FPD-Link II to CSI-2 Converter

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DS90UR910-Q1
SNLS414D – JUNE 2012 – REVISED JULY 2015
Layout Guidelines (continued)
9.1.3 CSI-2 Guidelines
1. CSI0_D*P/N and CSI1_D*P/N pairs should be routed with controlled 100-Ohm differential impedance (±
20%) or 50-Ohm single-ended impedance (±15%)
2. Keep away from other high speed signals
3. Keep length difference between a differential pair to 5 mils max
4. Length matching should be near the location of mismatch.
5. Match trace lengths between pairs to be < 25 mils.
6. Each pair should be separated at least by 3 times the signal trace width
7. The use of bends in differential traces should be kept to a minimum. When bends are used, the number of
left and right bends should be as equal as possible and the angle of the bend should be ≥ 135 degrees. This
arrangement minimizes any length mismatch caused by the bends and therefore minimizes the impact that
bends have on EMI.
8. Route all differential pairs on the same layer
9. The number of VIAS should be kept to a minimum. It is recommended to keep the VIA count to 2 or less
10. Keep traces on layers adjacent to ground plane
11. Do NOT route differential pairs over any plane split
12. Adding Test points will cause impedance discontinuity and will therefore negatively impact signal
performance. If test points are used, they should be placed in series and symmetrically. They must not be
placed in a manner that causes a stub on the differential pair
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