REVISION B 04/01/15
13
EVK-UFT285-6-7 EVALUATION BOARD USER GUIDE
Output Configuration
The outputs are ac-coupled, allowing for maximum flexibility for observation of the output whether configured for LVPECL, LVDS,
or LVCMOS levels. The default termination scheme can be used to measure either of the three output level-types but is not
optimal. The optimal termination circuits are tabulated below. Refer to
Figure 4
to locate the components listed below.
Table 3: Termination Outputs for Q0
Table 4: Termination Outputs for Q1
Table 5: Termination Outputs for Q2
Table 6: Termination Outputs for Q3
Table 7: Termination Outputs for Q4
Signal Type
180 ohm pull-down:
R39, R40
Series capacitors:
C123, C125
Resistor Network:
R35, R36, R41, R42
LVPECL (Default)
Installed
1µF
Not installed
LVCMOS
Not installed
33 ohm
Not installed
LVDS
Not installed
1µF
Not installed
Signal Type
180 ohm pull-down:
R43, R44
Series capacitors:
C124, C126
Resistor Network:
R37, R38, R45, R46
LVPECL (Default)
Installed
1µF
Not installed
LVCMOS
Not installed
33 ohm
Not installed
LVDS
Not installed
1µF
Not installed
Signal Type
180 ohm pull-down:
R60, R61
Series capacitors:
C133, C138
Resistor Network:
R52, R53, R62, R63
LVPECL (Default)
Installed
1µF
Not installed
LVCMOS
Not installed
33 ohm
Not installed
LVDS
Not installed
1µF
Not installed
Signal Type
180 ohm pull-down:
R64, R65
Series capacitors:
C134, C139
Resistor Network:
R54, R55, R66, R67
LVPECL (Default)
Installed
1µF
Not installed
LVCMOS
Not installed
33 ohm
Not installed
LVDS
Not installed
1µF
Not installed
Signal Type
180 ohm pull-down:
R77, R78
Series capacitors:
C143, C145
Resistor Network:
R68, R69, R79, R80
LVPECL (Default)
Installed
1µF
Not installed
LVCMOS
Not installed
33 ohm
Not installed
LVDS
Not installed
1µF
Not installed
