ICS8432I-101 Datasheet, PDF (11/18 Pages) Integrated Circuit Systems – 700MHZ, DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS8432I-101
700MHZ,
DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
LAYOUT GUIDELINE
The schematic of the ICS8432I-101 layout example used in
this layout guideline is shown in Figure 6A. The ICS8432I-101
recommended PCB board layout for this example is shown in
Figure 6B. This layout example is used as a general guideline.
The layout in the actual system will depend on the selected com-
ponent 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
M5
M6
M7
5
6
7
8
M8
N0
N1
nc
VEE
8432-101
C14
0.1u
nCLK
CLK
CLK
REF_IN
nCLK_SEL
24
23
22
21
XTAL_SEL
VDDA
S_LOAD
S_DATA
S_CLOCK
20
19
18
17
S_LOAD
S_DATA
S_CLOCK
MR
MR
VCCA
C11
0.01u
R7
10
C16
10u
Termination A
VCC
C15
0.1u
R1
R3
125
125
Zo = 50 Ohm
IN+
TL1
Zo = 50 Ohm
IN-
TL2
R2
R4
84
84
VCC
Termination B
(not shown in
the layout)
IN+
IN-
R2
R1
50
50
R3
50
FIGURE 6A. SCHEMATIC OF RECOMMENDED LAYOUT
8432DYI-101
www.icst.com/products/hiperclocks.html
11
REV. A MAY 23, 2005