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參數(shù)資料
| 型號(hào)： | ICS843004-02 |
| 英文描述： | CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| 中文描述： | 水晶到3.3的LVPECL頻率合成器 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 185K |
| 代理商： | ICS843004-02 |
843004AG-02
www.icst.com/products/hiperclocks.html
REV. A JULY 20, 2005
8
Integrated
Circuit
Systems, Inc.
ICS843004-02
C
RYSTAL
-
TO
-3.3V LVPECL
F
REQUENCY
S
YNTHESIZER
PRELIMINARY
C
RYSTAL
I
NPUT
I
NTERFACE
The ICS843004-02 has been characterized with 18pF paral-
lel resonant crystals. The capacitor values shown in Figure 2
Figure 2. C
RYSTAL
I
NPU
t I
NTERFACE
below were determined using a 26.5625MHz 18pF parallel
resonant crystal and were chosen to minimize the ppm error.
ICS843004-02
C1
27p
XTAL2
XTAL1
C2
33p
X1
18pF Parallel Crystal
T
ERMINATION
FOR
3.3V LVPECL O
UTPUT
The clock layout topology shown below is a typical termi-
nation for LVPECL outputs. The two different layouts men-
tioned are recommended only as guidelines.
V
CC
- 2V
50
50
RTT
Z
o
= 50
Z
o
= 50
FOUT
FIN
RTT =
Z
o
1
((V
OH
+ V
OL
) / (V
CC
– 2)) – 2
3.3V
125
125
84
84
Z
o
= 50
Z
o
= 50
FOUT
FIN
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, ter-
minating resistors (DC current path to ground) or current
sources must be used for functionality. These outputs are
F
IGURE
3B. LVPECL O
UTPUT
T
ERMINATION
F
IGURE
3A. LVPECL O
UTPUT
T
ERMINATION
designed to drive 50
transmission lines. Matched imped-
ance techniques should be used to maximize operating
frequency and minimize signal distortion. Figures 3A and
3B show two different layouts which are recommended
only as guidelines. Other suitable clock layouts may exist
and it would be recommended that the board designers
simulate to guarantee compatibility across all printed cir-
cuit and clock component process variations.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ICS843004A02 | CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS843004AG-02 | CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS843004AG-02T | CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS843004AGI-01 | FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER |
| ICS843004AGI-01LF | FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS843004-125 | 制造商:IDT 制造商全稱(chēng):Integrated Device Technology 功能描述:FemtoClock? Crystal-to-3.3V LVPECL Frequency Synthesizer |
| ICS843004A01 | 制造商:ICS 制造商全稱(chēng):ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS843004A02 | 制造商:ICS 制造商全稱(chēng):ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS843004AG | 制造商:ICS 制造商全稱(chēng):ICS 功能描述:FEMTOCLOCKS⑩ LVCMOS/CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS843004AG-01 | 制造商:ICS 制造商全稱(chēng):ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER |
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