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參數(shù)資料
| 型號： | ICS840001BGT |
| 英文描述： | FEMTOCLOCKS⑩ CRYSTAL-TO-LVCMOS/LVTTL CLOCK GENERATOR |
| 中文描述： | FEMTOCLOCKS⑩CRYSTAL-TO-LVCMOS/LVTTL時(shí)鐘發(fā)生器 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 194K |
| 代理商： | ICS840001BGT |
840001BG
www.icst.com/products/hiperclocks.html
REV. A MAY 10, 2004
7
Integrated
Circuit
Systems, Inc.
ICS840001
F
EMTO
C
LOCKS
C
RYSTAL
-
TO
-
LVCMOS/LVTTL C
LOCK
G
ENERATOR
A
PPLICATION
I
NFORMATION
Figure 2. C
RYSTAL
I
NPU
t I
NTERFACE
C
RYSTAL
I
NPUT
I
NTERFACE
The ICS840001 has been characterized with 18pF parallel
resonant crystals. The capacitor values, C1 and C2, shown in
Figure 2 below were determined using a 26.5625MHz, 18pF par-
allel resonant crystal and were chosen to minimize the ppm er-
ror. The optimum C1 and C2 values can be slightly adjusted for
different board layouts.
As in any high speed analog circuitry, the power supply pins are
vulnerable to random noise. The ICS840001 provides separate
power supplies to isolate any high switching noise from the out-
puts to the internal PLL. V
DD
, and V
DDA
should be individually con-
nected to the power supply plane through vias, and bypass ca-
pacitors should be used for each pin. To achieve optimum
jitter performance, power supply isolation is required. Figure 1
illustrates how a 10
resistor along with a 10
μ
F and a .01
μ
F
bypass capacitor should be connected to each V
DDA
pin.
P
OWER
S
UPPLY
F
ILTERING
T
ECHNIQUES
F
IGURE
1. P
OWER
S
UPPLY
F
ILTERING
10
V
DDA
10
μ
F
.01
μ
F
3.3V
.01
μ
F
V
DD
C1
33p
X1
18pF Parallel Crystal
C2
27p
XTAL_OUT
XTAL_IN
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ICS840001CK-32 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER |
| ICS840001CK-32LF | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER |
| ICS840001CK-32LFT | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER |
| ICS840001CK-32T | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER |
| ICS840001I | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER |
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