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参数资料
| 型号： | ICS843246AMLF |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 333.33 MHz, OTHER CLOCK GENERATOR, PDSO24 |
| 封装： | 7.50 X 15.33 MM, 2.30 MM HEIGHT, ROHS COMPLIANT, MS-013, MO-119, SOIC-24 |
| 文件页数： | 3/17页 |
| 文件大小： | 2371K |
| 代理商： | ICS843246AMLF |
IDT / ICS 3.3V LVPECL FREQUENCY SYNTHESIZER
11
ICS843246AM REV A SEPTEMBER 21, 2006
ICS843246
FEMTOCLOCKS CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/FANOUT BUFFER
PRELIMINARY
C3
10uF
R5
133
R7
50
VDD
N_SEL1
N_SEL0
VCCA
RU1
1K
18pF
RD1
Not Install
VCC
U1
843246
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
VC
C
O
VC
C
O
nQ2
Q2
nQ1
Q1
nQ0
Q0
PL
L
_
BYP
AS
S
V
CCA
VC
C
FB
_
S
E
L
XT
AL
_
IN
XT
AL
_
O
U
T
N_
S
E
L
0
VE
E
VE
E
N_
S
E
L
1
nQ5
Q5
nQ4
Q4
nQ3
Q3
VCCO=3.3V
VCC
C7
0.1uF
R2
10
R4
82.5
C2
22pF
To Logic
Input
pins
(U1-11)
Logic Control Input Examples
R6
82.5
+
-
VCC
PLL_BY PASS
C4
0.01u
Zo = 50 Ohm
(U1-2)
RD2
1K
Optional
Y-Termination
C1
22pF
VCCO
Zo = 50 Ohm
Set Logic
Input to
'0'
X1
25MHz
C5
0.1uF
R9
50
R8
50
VCC=3.3V
VDD
Zo = 50 Ohm
3.3V
VCCO
R3
133
C6
0.1uF
Zo = 50 Ohm
RU2
Not Install
To Logic
Input
pins
(U1-1)
FB_SEL
+
-
Set Logic
Input to
'1'
FIGURE 5. SCHEMATIC OF RECOMMENDED LAYOUT
LAYOUT GUIDELINE
Figure 5 shows an example of ICS843246 application sche-
matic. In this example, the device is operated at V
CC = 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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS843246AMLFT | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER |
| ICS843246AMT | 制造商:ICS 制造商全称:ICS 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER |
| ICS843246BGI | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER |
| ICS843246BGILF | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER |
| ICS843246BGILFT | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER |
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