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NeXLev®
Signal Integrity
Single-Ended | Differential
| Propagation Delay
| Single-Ended
Crosstalk/Reflections |
 |
| Test Conditions |
|
 |
| System Impedance |
50 Ohm Nominal, Actual Board Impedance:
52 Ohm 145 Real Signals/Inch, 1:0 Signal to Ground Pattern,
Nearest 12 Lines Driven.
|
|
| Method |
Victim line driven. Multiline crosstalk is calculated
by worst case summation of measured individual peaks
of the various crosstalk contributions.
|
|
 |
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| |
Multiline
Backward
Crosstalk
|
Multiline
Forward
Crosstalk
|
|
| A, J |
6.9%
|
-4.0%
|
|
| B, I |
5.6%
|
-1.9%
|
|
| C-H |
5.3%
|
-1.6%
|
|
| Table 3: Typical
Multiline Single-Ended Crosstalk for NeXLev 15mm
at Rise Time = 200 ps (20% to 80%) or 290ps (10%
to 90%) |
|
| |
Multiline
Backward
Crosstalk
|
Multiline
Forward
Crosstalk
|
|
| A, J |
4.4%
|
-2.4%
|
|
| B, I |
3.6%
|
-1.1%
|
|
| C-H |
3.4%
|
-0.9%
|
|
| Table 4: Typical
Multiline Single-Ended Crosstalk for NeXLev 15mm
at Rise Time = 350 ps (20% to 80%) or 500ps (10%
to 90%) |
|
Reflections (including the effect of PWB pad and via
launches) |
|
| Single Ended Reflections |
|
| Single
Row |
Rise Time
140ps (20-80%)
200ps (10-90%)
|
Rise Time
200ps (20-80%)
290ps (10-90%)
|
Rise Time
350ps (20-80%)
500ps (10-90%)
|
|
| A & J |
2.1%
1.3%
|
0.7%
-0.5%
|
0.2%
-0.2%
|
|
B, C, D, E,
F, G, H, I |
0.1%
-2.6%
|
0.0%
-1.4%
|
0.0%
-1.0%
|
|
|
Table 1: Typical Measured Reflections
from NeXLevT 15mm in single-ended mode. (Maximum
Positive Value / Maximum Negative Value)
Test Conditions:
System Impedance: 50 Ohm Nominal
Actual Board Impedance: 52 Ohm 145 Real Signals/Linear
Inch of Connector
See Note below for PWB pad and via launch description.
|
|
| Differential
Crosstalk/Reflections |
|
| Test Conditions |
|
System Differential
Impedance |
100 Ohm Nominal, Actual Board
Impedance: 104 Ohm 73 Real Pairs/Inch, 1:0 Signal to Ground
Pattern.
|
|
| Method |
Multiline crosstalk is calculated
by worst-case summation of measured individual peaks*
of the differential mode contributions. Contribution of
12 Closest Pairs. Signals Polarized for Maximum Crosstalk.
|
|
|
|
| |
Multiline
Backward
Crosstalk
|
Multiline
Forward
Crosstalk
|
|
| AB, IJ |
4.0%
|
2.3%
|
|
CD, EF,
GH |
3.4%
|
1.6%
|
|
| Table 5: Typical
Multiline Differential Crosstalk for NeXLev 15mm
at Rise Time = 100 ps (20% to 80%) or 145ps (10%
to 90%) |
|
| |
Multiline
Backward
Crosstalk
|
Multiline
Forward
Crosstalk
|
|
| AB, IJ |
2.3%
|
1.3%
|
|
CD, EF,
GH |
2.0%
|
0.8%
|
|
| Table 5: Typical
Multiline Differential Crosstalk for NeXLev 15mm
at Rise Time = 200 ps (20% to 80%) or 290ps (10%
to 90%) |
|
Reflections (including the effect of PWB pad and via
launches) |
|
| Differential
Reflections |
|
| Single
Row |
Rise Time
100ps (20-80%)
145ps (10-90%)
|
Rise Time
140ps (20-80%)
200ps (10-90%)
|
Rise Time
200ps (20-80%)
290ps (10-90%)
|
|
| AB, IJ |
0.7%
-5.1%
|
0.0%
-3.5%
|
0.0%
-2.5%
|
|
| CD, EF, GH |
0.5%
-3.3%
|
0.0%
-2.1%
|
0.0%
-1.5%
|
|
|
Table 2: Typical Measured Reflections
from NeXLevT 15mm in differential mode. (Maximum
Positive Value / Maximum Negative Value)
Test Conditions:
System Differential Impedance: 100 Ohms Nominal
Actual Board Impedance: 102 Ohms 73 Real Pairs/Linear
Inch of Connector. See Note below for PWB pad
and via launch description.
Differential Crosstalk to a (+/-) signal pair
is here calculated by the following formula:
noise (+) - noise (-)
Diff Xtalk = ----------------------------------
x 100%
signal swing(+) - signal swing (-)
NOTE: The measured capacitance of the PWB launch
for these measurements is 0.65 pF, corresponding
to a 0.35mm plated-through hole in 2.4mm board.
Non-functional pads were not removed on this test
board. Negative reflection amplitudes will decrease
by removing non-functional inner-layer pads, etc.
Results will vary with different printed circuit
boards.
|
|
| Propagation
Delay |
|
| Test Conditions |
|
| System Impedance |
50 Ohm, Actual Board Impedance:
52 Ohm 1:0 Signal to Ground Pattern Delay Measured at
50% Levels
|
|
| Test Signal Rise Time: |
100ps (10% to 90%)
|
|
|
NeXLevT 15mm Standard Signal
PWB #1
PWB #2
Connector Delay from PWB #1 signal pad/via to
PWB #2 signal pad/via = 101+/- 3 ps
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All other product names are the marks of the respective owners.
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