Common High-Speed Interface Requirements; Figure 18-2. Common Mode Choke; Table 18-2. Common High-Speed Interface Requirements - Nvidia Jetson Xavier NX Design Manual

18.5 Common High-Speed Interface
Requirements
The following table describes the common high-speed interface requirements.

Table 18-2. Common High-Speed Interface Requirements

Parameter
Common-mode Choke (Not recommended – only used if absolutely required for EMI issues)
Preferred device
Location - Max distance from to adjacent
discontinuities – ex, connector, AC cap)
Common-mode impedance @ 100MHz Min/Max
Max Rdc
Differential TDR impedance
Min Sdd21 @ 2.5GHz
Max Scc21 @ 2.5GHz
Serpentine
Min bend angle
Dimension
General
Routing over Voids
Noise Coupling
The following figures show the common high-speed interface signal routing requirements.

Figure 18-2. Common Mode Choke

NVIDIA Jetson Xavier NX
Requirement
8 (53)
65/90
0.3
90
2.22
19.2
135
Min A Spacing 4x
Min B, C Length 1.5x
Min Jog Width 3x
Routing over voids not allowed except void around device ball/pin the signal
is routed to.
Keep critical high-speed traces away from other signal traces or unrelated
power traces/areas or power supply components
General Routing Guidelines
Units Notes
Type: TDK ACM2012D-900-2P. Only if
needed. Place near connector. Refer to
Common Mode Choke Requirement
section.
mm (ps) TDK ACM2012D-900-2P
See Figure 18-2
Ω
Ω
@T -200ps (10%-90%)
R
Ω
dB
dB
deg (α) S1 must be taken care to consider Xtalk
to adjacent pair. See USB 3.2 Guideline
Trace width
in Figure 18-3.
DG-09693-001_v1.7 | 89