ICS8432-101_07 Datasheet, PDF (12/20 Pages) Integrated Device Technology – 700MHZ, DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER

ICS8432-101
700MHZ, DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
LAYOUT GUIDELINE
The schematic of the ICS8432-101 layout example used in this
layout guideline is shown in Figure 6A. The ICS8432-101
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
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
M5
M6
4 ^M7
5
6
7
8
M8
N0
N1
nc
VEE
8432-101
C14
0.1u
nCLK
CLK
CLK
REF_IN
24
23
22
XTAL_SEL
nCLK_SEL ₂₁
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
IDT^™ / ICS^™ 700MHZ, 3.3V LVPECL FREQUENCY SYNTHESIZER
12
ICS8432DY-101 REV. C APRIL 10, 2007