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參數(shù)資料
| 型號： | ICS843002I |
| 英文描述： | FEMTOCLOCKS-TM CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER |
| 中文描述： | FEMTOCLOCKS -商標(biāo)晶體到3.3伏，2.5伏的LVPECL頻率合成器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 212K |
| 代理商： | ICS843002I |
843002AGI
www.icst.com/products/hiperclocks.html
REV. A JANUARY 4, 2006
9
Integrated
Circuit
Systems, Inc.
ICS843002I
F
EMTO
C
LOCKS
C
RYSTAL
-
TO
-3.3V, 2.5V
LVPECL F
REQUENCY
S
YNTHESIZER
C
RYSTAL
I
NPUT
I
NTERFACE
The ICS843002I has been characterized with 18pF parallel
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.
ICS843002I
C1
33p
X1
18pF Parallel Crystal
C2
27p
XTAL_OUT
XTAL_IN
T
ERMINATION
FOR
3.3V LVPECL O
UTPUT
The clock layout topology shown below is a typical ter-
mination for LVPECL outputs. The two different layouts
mentioned are recommended only as guidelines.
V
CC
- 2V
50
Ω
50
Ω
RTT
Z
o
= 50
Ω
Z
o
= 50
Ω
FOUT
FIN
RTT =
Z
o
1
((V
OH
+ V
OL
) / (V
CC
– 2)) – 2
3.3V
125
Ω
125
Ω
84
Ω
84
Ω
Z
o
= 50
Ω
Z
o
= 50
Ω
FOUT
FIN
FOUT and nFOUT are low impedance follower outputs
that generate ECL/LVPECL compatible outputs. There-
fore, terminating resistors (DC current path to ground)
or current sources must be used for functionality. These
F
IGURE
3B. LVPECL O
UTPUT
T
ERMINATION
F
IGURE
3A. LVPECL O
UTPUT
T
ERMINATION
outputs are designed to drive 50
Ω
transmission lines.
Matched impedance techniques should be used to maxi-
mize operating frequency and minimize signal distor-
tion.
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 compat-
ibility across all printed circuit and clock component pro-
cess variations.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS843002I-01 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER |
| ICS843002I-40 | 制造商:ICS 制造商全稱:ICS 功能描述:175MHZ, FEMTOCLOCKS-TM VCXO BASED SONET/SDH JITTER ATTENUATOR |
| ICS843002I-41 | 制造商:ICS 制造商全稱:ICS 功能描述:700MHz, FEMTOCLOCKS-TM VCXO BASED SONET/SDH JITTER ATTENUATOR |
| ICS843002I-72 | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:FEMTOCLOCKS⑩ VCXO BASED WCDMA CLOCK GENERATOR/JITTER ATTENUATOR |
| ICS843003 | 制造商:ICS 制造商全稱:ICS 功能描述:FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
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