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ICS84330BY датащи(PDF) 12 Page - Integrated Circuit Systems

номер детали ICS84330BY
подробное описание детали  700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
PDF  19 Pages
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производитель  ICST [Integrated Circuit Systems]
домашняя страница  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS84330BY датащи(HTML) 12 Page - Integrated Circuit Systems

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84330BV
www.icst.com/products/hiperclocks.html
REV. B JULY 26, 2004
12
Integrated
Circuit
Systems, Inc.
ICS84330
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
If the FREF_EXT input is driven by a 3.3V LVCMOS driver, the
jitter performance can be improved by reducing the amplitude
swing and slowing down the edge rate.
Figure 7A shows an
amplitude reduction approach for a long trace. The swing will
be approximately 0.85V for logic low and 2.5V for logic high
R2
100
VDD
R1
100
Ro ~ 7 Ohm
Driver_LVCMOS
Zo = 50 Ohm
Td
RS
43
VDD
VDD
GND
TEST_CLK
VDD
VDD
GND
TEST_CLK
R1
200
RS
100
Ro ~ 7 Ohm
Driver_LVCMOS
R2
200
VDD
VDD
VDD
R1
400
R2
400
Ro ~ 7 Ohm
Driver_LVCMOS
RS
200
VDD
GND
TEST_CLK
JITTER REDUCTION FOR FREF_EXT SINGLE END INPUT
(instead of 0V to 3.3V).
Figure 7B shows amplitude reduction
approach for a short trace. The circuit shown in
Figure 7C
reduces amplitude swing and also slows down the edge rate
by increasing the resistor value.
FIGURE 7C. EDGE RATE REDUCTION BY INCREASING THE RESISTOR VALUE
FIGURE 7A. AMPLITUDE REDUCTION FOR A LONG TRACE
FIGURE 7B. AMPLITUDE REDUCTION FOR A SHORT TRACE
FREF_EXT
FREF_EXT
FREF_EXT



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