NB3M8T3910GEVB
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2
Table 1. OUTPUT DEDICATION OF THE NB3M8T3910GEVB
Output Pin Name
Output Type
(Dedicated)
SMODEA [1:0]
SMODEB [1:0]
Output Measurement Method
QA0/QA0b
LVPECL
0 0
x x
Use 50-
W
Scope Head; there is no load on the board
QA1/QA1b
LVPECL
0 0
x x
Use 50-
W
Scope Head; there is no load on the board
QA2/QA2b
LVDS
0 1
x x
Measure with Single or Differential Hi-Z Probes; Outputs
have 100-
W
termination resistor across at SMA
connectors
QA3/QA3b
HCSL
1 0
x x
Use 50-
W
Scope Head; there is no 50-
W
to GND on the
board; or install 50-
W
SMA terminators and use a Hi-Z
probe
QA4/QA4b
HCSL
1 0
x x
Use 50-
W
Scope Head; there is no 50-
W
to GND on the
board; or install 50-
W
SMA terminators and use a Hi-Z
probe
QB0/QB0b
LVPECL
x x
0 0
Measure with Single or Differential Hi-Z Probes; these
LVPECL outputs have a Thevenin termination resistor
network.
QB1/QB1b
LVDS
x x
0 1
Measure with Single or Differential Hi-Z Probes; Outputs
have 100-
W
termination resistor across at SMA
connectors
QB2/QB2b
LVDS
x x
0 1
Measure with Single or Differential Hi-Z Probes; Outputs
have 100-
W
termination resistor across at SMA
connectors
QB3/QB3b
HCSL
x x
1 0
Measure with Single or Differential Hi-Z Probes; there is
50-
W
to GND on the board
QB4/QB4b
HCSL
x x
1 0
Use 50-
W
Scope Head; there is no 50-
W
to GND on the
board; or install 50-
W
SMA terminators and use a Hi-Z
probe
NOTE: x = don’t care
LVDS OUTPUT CONFIGURATION
Figure 2. LVDS Output Configuration
Two 0-
W
Resistors
100-
W
Resistor
LVDS outputs are typically terminated with 100-
Ω
across
the Q & Qb output pair.
On QA2/QA2b, QB1/QB1b, QB2/QB2b, there are
on-board 100-ohm output termination resistors across the
LVDS outputs. Two 0-
Ω
resistors connect the metal traces
and a 100-
Ω
resistor connects between the traces.
Use a single-ended or differential high-impedance probe
across the 100-
Ω
resistor.
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