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参数资料
| 型号： | 011AL |
| 英文描述： | FEMTOCLOCKS-TM CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR |
| 中文描述： | FEMTOCLOCKS -商标晶体至3.3V的LVPECL时钟发生器 |
| 文件页数： | 11/13页 |
| 文件大小： | 231K |
| 代理商： | 011AL |
843011AG
www.icst.com/products/hiperclocks.html
REV. B DECEMBER 10, 2004
7
Integrated
Circuit
Systems, Inc.
ICS843011
FEMTOCLOCKSCRYSTAL-TO-
3.3V LVPECL CLOCK GENERATOR
APPLICATION SCHEMATIC
Figure 3A shows a schematic example of the ICS843011. An
example of LVEPCL termination is shown in this schematic.
Additional LVPECL termination approaches are shown in the
LVPECL Termination Application Note. In this example, an 18 pF
parallel resonant 26.5625MHz crystal is used for generating
106.25MHz output frequency. The C1 = 27pF and C2 = 33pF
are recommended for frequency accuracy. For different board
layout, the C1 and C2 values may be slightly adjusted for opti-
mizing frequency accuracy.
FIGURE 3A. ICS843011 SCHEMATIC EXAMPLE
FIGURE 3B. ICS843011 PC BOARD LAYOUT EXAMPLE
PC BOARD LAYOUT EXAMPLE
Figure 3B shows an example of ICS843011 P.C. board layout.
The crystal X1 footprint shown in this example allows installa-
tion of either surface mount HC49S or through-hole HC49 pack-
age.The footprints of other components in this example are listed
in the
Table 6. There should be at least one decoupling capacitor
per power pin. The decoupling capacitors should be located as
close as possible to the power pins. The layout assumes that
the board has clean analog power ground plane.
TABLE 6. FOOTPRINT TABLE
e
c
n
e
r
e
f
e
Re
z
i
S
2
C
,
1
C2
0
4
0
3
C5
0
8
0
5
C
,
4
C3
0
6
0
2
R3
0
6
0
t
n
e
n
o
p
m
o
c
s
t
s
il
,
6
e
l
b
a
T
:
E
T
O
N
.
e
l
p
m
a
x
e
t
u
o
y
a
l
s
i
h
t
n
i
n
w
o
h
s
e
z
i
s
R2
10
18pF
VCC
Zo = 50 Ohm
VCC
R4
82.5
C3
10uF
C2
33pF
R6
82.5
R5
133
nQ
+
-
U1
ICS843011
1
2
3
4
8
7
6
5
VCCA
VEE
XTAL_OUT
XTAL_IN
VCC
Q0
nQ0
NC
VCCA
R3
133
X1
Q
C5
0.1u
C4
0.01u
VCC=3.3V
C1
22pF
VCC
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