參數(shù)資料
型號: ICS84330BV
元件分類: 時鐘產(chǎn)生/分配
英文描述: 700 MHz, OTHER CLOCK GENERATOR, PQCC28
封裝: 11.60 X 11.40 MM, 4.10 MM HEIGHT, MS-018, PLASTIC, LCC-28
文件頁數(shù): 19/19頁
文件大小: 247K
代理商: ICS84330BV
84330BV
www.icst.com/products/hiperclocks.html
REV. C MAY 16, 2006
9
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 4A 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
GND
TEST_CLK
VDD
GND
TEST_CLK
R1
200
RS
100
Ro ~ 7 Ohm
Driver_LVCMOS
R2
200
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 4B shows amplitude reduction
approach for a short trace. The circuit shown in Figure 4C
reduces amplitude swing and also slows down the edge rate
by increasing the resistor value.
FIGURE 4C. EDGE RATE REDUCTION BY INCREASING THE RESISTOR VALUE
FIGURE 4A. AMPLITUDE REDUCTION FOR A LONG TRACE
FIGURE 4B. AMPLITUDE REDUCTION FOR A SHORTTRACE
FREF_EXT
相關(guān)PDF資料
PDF描述
ICS84330BVLF 700 MHz, OTHER CLOCK GENERATOR, PQCC28
ICS84330BY 700 MHz, OTHER CLOCK GENERATOR, PQFP32
ICS84330CM-01LF 700 MHz, OTHER CLOCK GENERATOR, PDSO28
ICS84330CVI 720 MHz, OTHER CLOCK GENERATOR, PQCC28
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