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參數(shù)資料
| 型號： | ICS843246I |
| 廠商： | Integrated Device Technology, Inc. |
| 英文描述： | FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER |
| 中文描述： | FEMTOCLOCKS⑩晶體至3.3的LVPECL頻率合成瓦/扇出緩沖器集成 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大?。?/td> | 345K |
| 代理商： | ICS843246I |
IDT
/ ICS
3.3V LVPECL FREQUENCY SYNTHESIZER
11
ICS843246BGI REV. A AUGUST 2, 2007
ICS843246I
FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/FANOUT BUFFER
F
IGURE
5. S
CHEMATIC
OF
R
ECOMMENDED
L
AYOUT
L
AYOUT
G
UIDELINE
Figure 5
shows an example of ICS843246I application sche-
matic. In this example, the device is operated at V
= 3.3V. The
18pF parallel resonant 25MHz crystal is used. The C1 = 22pF
and C2 = 22pF are recommended for frequency accuracy. For
different board layout, the C1 and C2 may be slightly adjusted
for optimizing frequency accuracy. Two examples of LVPECL
termination are shown in this schematic. Additional termination
approaches are shown in the LVPECL Termination Application
Note.
C5
0.1uF
C4
0.01u
N_SEL0
Zo = 50 Ohm
VCC
(U1-2)
18pF
R6
RU2
Not Install
RU1
1K
Zo = 50 Ohm
C1
VCCO=3.3V
R4
RD2
1K
Set Logic
Input to
'1'
VCCO
C7
0.1uF
Set Logic
Input to
'0'
VCC
3.3V
C3
10uF
VCC=3.3V
R9
50
R3
133
R8
50
Optional
Y-Termination
VDD
C6
0.1uF
(U1-11)
RD1
Not Install
To Logic
Input
pins
R2
10
X1
25MHz
Zo = 50 Ohm
U1
843246I
1
2
3
4
5
6
7
8
9
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
V
V
n
Q
n
Q
n
Q
P
V
V
F
X
X
N
V
V
N
n
Q
n
Q
n
Q
VCC
VCCO
Zo = 50 Ohm
To Logic
Input
pins
N_SEL1
PLL_BYPASS
R5
133
(U1-1)
VDD
+
-
R7
50
+
-
C2
22pF
Logic Control Input Examples
FB_SEL
VCCA
F
IGURE
6. P.C. B
OARD
FOR
E
XPOSED
P
AD
T
HERMAL
R
ELEASE
P
ATH
E
XAMPLE
EXPOSED PAD
Expose Metal Pad
(GROUND PAD)
GROUND PLANE
SOLDER
SIGNAL
TRACE
SIGNAL
TRACE
THERMAL VIA
SOLDER MASK
T
HERMAL
R
ELEASE
P
ATH
T
he expose metal pad provides heat transfer from the device
to the P.C. board. The expose metal pad is ground pad
connected to ground plane through thermal via. The exposed
pad on the device to the exposed metal pad on the PCB is
contacted through solder as shown in
Figure 4.
For further
information, please refer to the Application Note on Surface
Mount Assembly of Amkor’s Thermally /Electrically Enhance
Leadframe Base Package, Amkor Technology.
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| ICS84324EM | 制造商:ICS 制造商全稱:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER |
| ICS84324EMT | 制造商:ICS 制造商全稱:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER |
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