ICS8430002 Datasheet, PDF (20/27 Pages) Integrated Device Technology – High-Performance Fractional-N Frequency Synthesizer

ICS8430002 Data Sheet
HIGH-PERFORMANCE FRACTIONAL-N FREQUENCY SYNTHESIZER
Schematic Example
Figure 9 shows an example of ICS8430002 application
schematic. In this example, the device is operated at V_CC =
V_CCO = 3.3V. The device are be driven by a crystal, LVCMOS
or LVPECL input sources. The 18pF parallel resonant 25MHz
crystal is used. The C1 = 27pF and C2 = 27pF are
recommended for frequency accuracy. For different board
layout, the C1 and C2 may be slightly adjusted for optimizing
frequency accuracy. For the LVPECL output drivers, only two
termination examples are shown in this schematic. Additional
termination approaches are shown in the LVPECL
Termination Application Note.
3.3V
Zo = 50 Ohm
Zo = 50 Ohm
LVPECL
Driver_LVPECL
VCC
R1
R2
133
133
R5
82.5
R6
82.5
FOUTB
nFOUTB
Zo = 50 Ohm
Zo = 50 Ohm
Optional
Y-Termination
+
-
R10
R11
50
50
R12
50
VCC=3.3V
VCCO=3.3V
U1
VCC
C5
0.1u
P2
NB0
NB1
NB2
OE_REF
OE_A
OE_B
VCC
NA0
NA1
NA2
1
2
3
4
5
P2
NB0
NB1
NB2
6
7
8
9
10
OE_REF
OE_A
OE_B
VCC
NA0
11
12
NA1
NA2
VEE
36
nc
nc
X_OUT
X_IN
35
34
33
32
nc
nc
SEL
VCCA
S_LOAD
31
30
29
28
27
S_DATA
S_CLOCK
MR
26
25
2₁ 5₈ M_p H_F z
X1
C1
27pF
SEL
VCCA
C3
0.01u
MR
C2
27pF
R9
VCC
C4
10
10u
VCCO
8430002
C8
0.1u
C9
0.1u
VCC
C6
0.1u
Logic Control Input Examples
Set Logic
Set Logic
VCC
VCC
Input to '1'
Input to '0'
RU1
1K
To Logic
Input
pins
RD1
Not Install
RU2
Not Install
To Logic
Input
pins
RD2
1K
VCCO
C7
0.1u
REF_OUT
3.3V
FOUTA
R3
133
Zo = 50 Ohm
R13
33
Zo = 50 Ohm
LVCMOS
R4
133
+
Zo = 50 Ohm
nFOUTA
R7
82.5
-
R8
82.5
Figure 9. ICS8430002 Schematic Example
ICS8430002AY REVISION C NOVEMBER 12, 2009
20
©2009 Integrated Device Technology, Inc.