ICS8432I-51 Datasheet, PDF (10/16 Pages) Integrated Circuit Systems – 700MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS8432I-51
700MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
LAYOUT GUIDELINE
The schematic of the ICS8432I-51 layout example used in
this layout guideline is shown in Figure 5A. The ICS8432I-51
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
3
4
5
6
M5
M6
M7
M8
N0
7
8
N1
nc
VEE
ICS8432I-51
C14
0.1u
C1
C2
X1
VCC
XTAL2
REF_IN
nXTAL_SEL
VCCA
S_LOAD
24
23
22
21
20
19
R EF _I N
XTAL_SEL
S_LOAD
S_DATA
S_DATA
S_CLOCK
MR
18
17
S_CLOCK
VC C A
C11
0.01u
R7
10
C16
10u
C 15
0.1u
Zo = 50 Ohm
TL1
Zo = 50 Ohm
TL2
VCC
R1
R3
125
125
+
-
R2
R4
84
84
FIGURE 5A. SCHEMATIC OF RECOMMENDED LAYOUT
8432BYI-51
www.icst.com/products/hiperclocks.html
10
REV. A MAY 28, 2003