ICS84329 Datasheet, PDF (11/19 Pages) Integrated Circuit Systems – 700MHZ, LOW JITTER, CRYSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS84329
700MHZ, LOW JITTER, CRYSTAL-TO-3.3V
DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER
LAYOUT GUIDELINE
The schematic of the ICS84329 layout example used in this
layout guideline is shown in Figure 6A. The ICS84329 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.
VCC=3.3V
S P = S p ace (i .e . n o t i ntsta lle d )
M [8:0]= 11 0 01 0 00 0 (4 00 )
N[1 :0 ] =0 1 (Di vid e by 2 )
M4
12
M5
M6
M7
M8
N2
N1
13
14
15
16
17
18
M4
M5
M6
M7
M8
N0
N1
U1
84329AV
VCC
RU0
SP
RU1
SP
RU7
1K
RU8
1K
RU9
SP
RU10 RU11 RU12
1K
SP
1K
C2
0.1u
RD0
1K
RD1
1K
RD7
SP
RD8
SP
RD9
1K
RD10 RD6
SP
1K
RD12
SP
16MHz,18pF
X1
4
XTALIN
nc
nc
VCCA
S_LOAD
S_DATA
S_CLOCK
3
2
1
28
27
26
C3
22p
VCC
C4
R7
22p
10
VCCA
C11
0.01u
C16
10u
C1
0.1uF
Zo = 50 Ohm
Fout = 200 MHz
Zo = 50 Ohm
R2
R1
50
50
R3
50
FIGURE 6A. SCHEMATIC OF RECOMMENDED LAYOUT
84329AV
www.icst.com/products/hiperclocks.html
11
REV. D DECEMBER 15, 2004