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參數(shù)資料
| 型號(hào)： | ICS843002I-01 |
| 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(yè)數(shù)： | 8/15頁(yè) |
| 文件大?。?/td> | 208K |
| 代理商： | ICS843002I-01 |
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843002AGI-01
www.icst.com/products/hiperclocks.html
REV. A JANUARY 6, 2006
8
Integrated
Circuit
Systems, Inc.
ICS843002I-01
F
EMTO
C
LOCKS
C
RYSTAL
-
TO
-
3.3V, 2.5V LVPECL F
REQUENCY
S
YNTHESIZER
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 com-
patibility across all printed circuit and clock component
process variations.
I
NPUTS
:
C
RYSTAL
I
NPUT
:
For applications not requiring the use of the crystal oscillator
input, both XTAL_IN and XTAL_OUT can be left floating.
Though not required, but for additional protection, a 1k
Ω
resistor can be tied from XTAL_IN to ground.
REF_CLK I
NPUT
:
For applications not requiring the use of the reference clock,
it can be left floating. Though not required, but for additional
protection, a 1k
Ω
resistor can be tied from the REF_CLK to
ground.
LVCMOS C
ONTROL
P
INS
:
All control pins have internal pull-ups or pull-downs; additional
resistance is not required but can be added for additional
protection. A 1k
Ω
resistor can be used.
R
ECOMMENDATIONS
FOR
U
NUSED
I
NPUT
AND
O
UTPUT
P
INS
O
UTPUTS
:
LVPECL O
UTPUT
All unused LVPECL outputs can be left floating. We
recommend that there is no trace attached. Both sides of the
differential output pair should either be left floating or
terminated.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ICS843002AGI | FEMTOCLOCKS-TM CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER |
| ICS843002AGILF | FEMTOCLOCKS-TM CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER |
| ICS843002AGILFT | FEMTOCLOCKS-TM CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER |
| ICS843002AGIT | FEMTOCLOCKS-TM CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER |
| ICS843002I | 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 |
|---|---|
| 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 |
| ICS843003AG | 制造商:ICSI 制造商全稱:Integrated Circuit Solution Inc 功能描述:FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
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