Datasheet

V
ID
= 0 V
V
OD
= 0 V
t
PLHD
t
PHLD
IN
OUT
ClockInput
V =0V
ID
V
A
V
B
1/fo
PRBSInput
V
A
V
B
PRBSOutput
V
Y
V
Z
V
Y
− V
Z
V
Y
− V
Z
V
Y
− V
Z
ActualOutput
IdealOutput
1/fo
PeriodJitter Cycle-to-CycleJitter
Peak-to-PeakJitter
ActualOutput
t
jit(pp)
t
c(n)
t
c(n)
t
c(n +1)
t
jit(pp)
=|t
c(n)
− 1/fo|
t
jit(cc)
=|t
c(n)
− t
c(n + 1)
|
V =0V
ID
V =0V
OD
V =0V
OD
V =0V
OD
V =0V
OD
25-inchFR4
Coax
(63,5cm)
<3-inch50 TL
(7,62cm)
W
<3-inch50 TL
(7,62cm)
W
SN65LVCP408
Jitter Test
Instruments
Pre-amp
Coupled
TransmissionLine
400mV
Differential
PP
Characterization TestBoard
Pattern
Generator
Coax
Coax
SMA
DC
Block
DC
Block
DC
Block
RX
+
EQ
SMA
SMA
Coax
SMA
DC
Block
SN65LVCP408
www.ti.com SLLS842A –JUNE 2009–REVISED JUNE 2010
PARAMETER MEASUREMENT INFORMATION (continued)
Figure 6. Propagation Delay Input to Output
A. All input pulses are supplied by an Agilent 81250 Stimulus System.
B. The measurement is made with the AgilentParBert measurement software.
Figure 7. Driver Jitter Measurement Waveforms
For the rise/fall time measurements, the 25-inch FR4 transmission line is removed.
Figure 8. AC Test Circuit — Jitter and Output Rise Time Test Circuit
The SN65LVCP408 input equalizer provides frequency gain to compensate for frequency loss of a shorter
backplane transmission line. For characterization purposes, a 25-inch (63,5 cm) FR-4 coupled transmission line
is used in place of the backplane trace. The 25-inch trace provides roughly 5 dB of attenuation between 375 MHz
and 2.125 GHz, representing closely the characteristics of a short backplane trace. The loss tangent of the FR4
in the test board is 0.018 with an effective e(r) of 4.1.
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