ICS84320-01 Datasheet, PDF (12/21 Pages) Integrated Circuit Systems – 780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

ICS84320-01
780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
LAYOUT GUIDELINE
The schematic of the ICS84320-01 layout example used in
this layout guideline is shown in Figure 6A. The ICS84320-
01 recommended PCB board layout for this example is
shown in Figure 6B. This layout example is used as a gen-
eral guideline. The layout in the actual system will depend
on the selected component types, the density of the compo-
nents, the density of the traces, and the stack up of the P.C.
board.
U1
1
2
M5
3
4
5
M6
M7
M8
6 ^N0
7 ^N1
8
nc
VEE
ICS84320-01
C14
0.1u
C1
C2
X1
VCC
XTAL2
24
23
REF_IN
T_CLK
nXTAL_SEL
VCCA
22
21
20
XTAL_SEL
S_LOAD
S_LOAD _{19 S_DATA}
S_DATA _{18 S_CLOCK}
S_CLOCK
MR
17
VCCA
C11
0.01u
R7
24
C16
10u
C15
0.1u
Zo = 50 Ohm
IN+
TL1
Zo = 50 Ohm
IN-
TL2
VCC
R1
R3
125
125
+
-
R2
R4
84
84
FIGURE 6A. SCHEMATIC OF RECOMMENDED LAYOUT
84320AY-01
12
REV. C OCTOBER 22, 2007