
84320AY-01
www.idt.com
REV. D JULY 26, 2010
12
ICS84320-01
780MHZ, CRYSTAL-TO-3.3V DIFFERENTIAL
LVPECL FREQUENCY SYNTHESIZER
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-
LAYOUT GUIDELINE
FIGURE 6A. SCHEMATIC OF RECOMMENDED LAYOUT
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.
R4
84
C16
10u
+
-
C11
0.01u
REF_IN
C14
0.1u
VC
C
IN+
TL1
Zo = 50 Ohm
C1
S_CLOCK
VCCA
VCC
FO
UT
VCC
U1
ICS84320-01
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
32
31
30
29
28
27
26
25
M5
M6
M7
M8
N0
N1
nc
VEE
TE
S
T
VC
C
FO
U
T
1
nF
O
U
T
1
V
CCO
FO
U
T
0
nF
O
U
T
0
VEE
MR
S_CLOCK
S_DATA
S_LOAD
VCCA
nXTAL_SEL
T_CLK
XTAL2
M4
M3
M2
M1
M0
V
C
O
_SEL
nP_LO
AD
XT
AL
1
S_DATA
TL2
Zo = 50 Ohm
X1
C2
S_LOAD
R7
24
XTAL_SEL
FO
U
T
N
IN-
R3
125
R1
125
R2
84
C15
0.1u
VC
C