ICS8442 Datasheet, PDF (10/15 Pages) Integrated Circuit Systems – 700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL LVDS FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS8442
700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL
LVDS FREQUENCY SYNTHESIZER
LAYOUT GUIDELINE
The schematic of the ICS8442 layout example used in this layout
guideline is shown in Figure 5A. The ICS8442 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 actual
system will depend on the selected component types, the den-
sity of the components, the density of the traces, and the stack
up of the P.C. board.
U1
1
2
3
4
M5
M6
M7
5 ^M8
6
7
8
N0
N1
nc
GND
ICS8442
C1
C2
X1
XTAL1
T_CLK
nXTAL_SEL
24
23
22
21
VDDA ₂₀
S_LOAD
S_DATA
S_CLOCK
MR
19
18
17
VDD
VDDA
C11
0.01u
R7
10
C16
10u
C14
0.1u
8442AY
Zo = 50 Ohm
TL1
C15
R1
0.1u
100
Zo = 50 Ohm
TL1N
Zo = 50 Ohm
TL2
R2
100
Zo = 50 Ohm
TL2N
FIGURE 5A. RECOMMENDED SCHEMATIC LAYOUT
www.icst.com/products/hiperclocks.html
10
+
-
+
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REV. C JULY 8, 2004