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參數(shù)資料
| 型號： | ICS84321AYT |
| 英文描述： | 260MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
| 中文描述： | 260MHZ，水晶到3.3V的差分LVPECL頻率合成器 |
| 文件頁數(shù)： | 3/18頁 |
| 文件大小： | 204K |
| 代理商： | ICS84321AYT |
84321AY
www.icst.com/products/hiperclocks.html
REV. B JUNE 9, 2005
11
Integrated
Circuit
Systems, Inc.
ICS84321
260MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
The schematic of the ICS84321 layout example used in this lay-
out guideline is shown in
Figure 5A. The ICS84321 recommended
PCB board layout for this example is shown in
Figure 5B. This
layout example is used as a general guideline. The layout in the
LAYOUT GUIDELINE
FIGURE 5A. SCHEMATIC OF RECOMMENDED LAYOUT
actual system will depend on the selected component types, the
density of the components, the density of the traces, and the
stack up of the P.C. board.
As in any high speed analog circuitry, the power supply pins
are vulnerable to random noise. The ICS84321 provides sepa-
rate power supplies to isolate any high switching
noise from the outputs to the internal PLL. V
CC, VCCA, and VCCO
should be individually connected to the power supply
plane through vias, and bypass capacitors should be
used for each pin. To achieve optimum jitter performance,
power supply isolation is required.
Figure 4 illustrates how
a 24
Ω resistor along with a 10μF and a .01μF bypass
capacitor should be connected to each V
CCA pin.
POWER SUPPLY FILTERING TECHNIQUES
FIGURE 4. POWER SUPPLY FILTERING
24
Ω
V
CCA
10
μF
.01
μF
3.3V
.01
μF
V
CC
FO
U
T
REF_IN
S_LOAD
VCCA
VC
C
FO
U
TN
R2
84
VCC
XTAL_SEL
Zo = 50 Ohm
R4
84
S_DATA
R3
125
Zo = 50 Ohm
+
-
S_CLOCK
C14
0.1u
VCC
C1
U1
ICS84321
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
32
31
30
29
28
27
26
25
M5
M6
M7
M8
N0
N1
nc
VEE
T
EST
VC
C
FO
U
T1
nF
O
U
T
1
VC
C
O
FO
U
T0
nF
O
U
T
0
VEE
MR
S_CLOCK
S_DATA
S_LOAD
VCCA
nXTAL_SEL
T_CLK
X_OUT
M4
M3
M2
M1
M0
VC
O
_
SEL
nP
_
LO
A
D
X_
IN
C15
0.1u
R7
10
X1
C16
10u
R1
125
C2
C11
0.01u
VC
C
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ICS84321I | 制造商:ICS 制造商全稱:ICS 功能描述:260MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER |
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| ICS843241I-04 | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:FEMTOCLOCKSa?￠ CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR |
| ICS843242 | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
| ICS843242AG | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:FEMTOCLOCKS⑩ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER |
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