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参数资料
| 型号： | ICS84325EM |
| 元件分类： | XO, clock |
| 英文描述： | 250 MHz, OTHER CLOCK GENERATOR, PDSO24 |
| 封装： | 15.33 X 7.50 MM, 2.30 MM HEIGHT, MS-013, MO-119, SOIC-24 |
| 文件页数： | 14/15页 |
| 文件大小： | 275K |
| 代理商： | ICS84325EM |
84325EM
www.icst.com/products/hiperclocks.html
REV. B OCTOBER 11, 2004
8
Integrated
Circuit
Systems, Inc.
ICS84325
CRYSTAL-TO-3.3V LVPECL
FREQUENCY SYNTHESIZER WITH FANOUT BUFFER
SCHEMATIC EXAMPLE
Figure 5A shows a schematic example of using an ICS84325. In
this example, the input is a 25MHz parallel resonant crystal with
load capacitor CL=18pF. The frequency fine tuning capacitors
C1 and C2 are 22pF respectively. This example also shows logic
control input handling.The configuration is set at F_SEL[1:0]=11
FIGURE 5A. ICS84325 SCHEMATIC EXAMPLE
therefore the output frequency is 250MHz. It is recommended to
have one decouple capacitor per power pin. Each decoupling
capacitor should be located as close as possible to the power
pin. The low pass filter R7, C11 and C16 for clean analog supply
should also be located as close to the V
CCA pin as possible.
Figure 4. CRYSTAL INPUt INTERFACE
were chosen to minimize the ppm error. The optimum C1 and C2
values can be slightly adjusted for different board layouts.
C1
22p
X1
18pF Parallel Cry stal
C2
22p
XTAL2
XTAL1
R1
50
R3
50
R4
1K
Zo = 50
C6
0.1u
C1
22p
RD3
SP
Zo = 50
C5
0.1u
VCC
C16
10u
RU3
1K
C3
0.1u
VCC
C2
22p
U7
ICS84325
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Q0
nQ0
Q1
nQ1
Q2
nQ2
Q3
nQ3
Q4
nQ4
Q5
nQ5
VCC
VEE
PLL_SEL
VCC
VCCA
VEE
XTAL2
XTAL1
MR
F_SEL1
F_SEL0
VCC
X1
25MHz,18pF
SP = Spare, Not Installed
R5
1K
RD2
SP
C11
0.1u
VCC
e.g. F_SEL[1:0]=11
(U1,16)
VCCA
(U1,13)
F_SEL1
(U1,24)
F_SEL0
F_SEL1
VCC
F_SEL0
VCC=3.3V
+
-
R7
24
R2
50
RU2
1K
CRYSTAL INPUT INTERFACE
The ICS84325 has been characterized with 18pF parallel resonant
crystals. The capacitor values, C1 and C2, shown in
Figure 3 below
were determined using a 25MHz, 18pF parallel resonant crystal and
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS84325EMLN | 制造商:ICS 制造商全称:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER |
| ICS84325EMLNT | 制造商:ICS 制造商全称:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER |
| ICS84325EMT | 制造商:ICS 制造商全称:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER |
| ICS84326 | 制造商:ICS 制造商全称:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL SERIAL ATTACHED SCSI CLOCK SYNTHESIZER/FANOUT BUFFER |
| ICS84326AM | 制造商:ICS 制造商全称:ICS 功能描述:CRYSTAL-TO-3.3V LVPECL SERIAL ATTACHED SCSI CLOCK SYNTHESIZER/FANOUT BUFFER |
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