ICS8442I Datasheet, PDF (10/15 Pages) Integrated Circuit Systems – 700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL LVDS FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS8442I
700MHZ, CRYSTAL OSCILLATOR-TO-DIFFERENTIAL
LVDS FREQUENCY SYNTHESIZER
LAYOUT GUIDELINE
The schematic of the ICS8442I layout example used in this lay-
out guideline is shown in Figure 5A. The ICS8442I 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
density of the components, the density of the traces, and the
stack up of the P.C. board.
U1
1
2
M5
3
4
5
6
7
M6
M7
M8
N0
N1
8
nc
GND
ICS8442
C1
C2
X1
X_OUT
24
23
T_CLK
nXTAL_SEL
VDDA
S_LOAD
S_DATA
22
21
20
19
18
S_CLOCK
MR
17
VDD
VDDA
C11
0.01u
R7
10
C16
10u
C14
0.1u
Zo = 50 Ohm
+
R1
C15
Zo = 50 Ohm
100
0.1u
-
Zo = 50 Ohm
+
R2
Zo = 50 Ohm
100
-
FIGURE 5A. RECOMMENDED SCHEMATIC LAYOUT
8442AYI
www.icst.com/products/hiperclocks.html
10
REV. C MAY 10, 2005