ICS84320I-01 Datasheet, PDF (12/18 Pages) Integrated Circuit Systems – 780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL

Integrated
Circuit
Systems, Inc.
ICS84320I-01
780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
LAYOUT GUIDELINE
The schematic of the ICS84320I-01 layout example used in
this layout guideline is shown in Figure 5A. The ICS84320I-01
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
ICS84320i-01
C14
0.1u
VCC=3.3V
C1
C2
X1
VCC
24
X_OUT
T_CLK
XTAL_SEL
VCCA
S_LOAD
23
22
21
20
19
S_DATA
S_CLOCK
MR
18
17
REF_IN
XTAL_SEL
S_LOAD
S_DATA
S_CLOCK
VCCA
C11
0.01u
R7
10
C16
10u
C15
0.1u
Zo = 50 Ohm
TL1
Zo = 50 Ohm
nTL1
VCC
R1
R3
125
125
+
-
R2
R4
84
84
FIGURE 5A. SCHEMATIC OF RECOMMENDED LAYOUT
84320AYI-01
www.icst.com/products/hiperclocks.html
12
REV. A AUGUST 11, 2005