843034I-06 Datasheet, PDF (17/25 Pages) Integrated Device Technology – FemtoClock™ Multi-Rate 3.3V LVPECL Frequency Synthesizer

ICS43034I-06 Data Sheet
FEMTOCLOCK™ MULTI-RATE 3.3V LVPECL FREQUENCY SYNTHESIZER
APPLICATION SCHEMATIC EXAMPLE
Figure 9 shows an example of 843034I-06 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
VCC
R1
R2
133
133
Zo = 50 Ohm
LVPECL
Driver_LVPECL
R5
82.5
R6
82.5
U1
M8
VCC
C5
0.1u
OE_REF
OE_A
OE_B
VCC
NA0
NA1
NA2
1
2 ^M8
3 ^RESERVED
4 ^RESERVED
5 ^RESERVED
6
7
OE_REF
OE_A
8 ^OE_B
9 ^VCC
10 ^NA0
11 ^NA1
12 ^NA2
VEE
36
XTAL_OUT1 ₃₅
XTAL_IN1 ₃₄
XTAL_OUT0 ₃₃
XTAL_IN0 ₃₂
REF_CLK
SEL1
31
30
SEL0 ₂₉
VCCA ₂₈
S_LOAD ₂₇
S_DATA ₂₆
S_CLOCK ₂₅
MR
Logic Control Input Examples
Set Logic
VCC
Input to
'1'
RU1
1K
Set Logic
VCC
Input to
'0'
RU2
Not Install
To Logic
Input
pins
RD1
Not Install
To Logic
Input
pins
RD2
1K
VCC
VCCO
C6
0.1u
VCCO
C8
0.1u
C7
0.1u
VCCO
C9
0.1u
25MHz X1
18pF
SEL1
SEL0
C1
27pF
C2
27pF
VCCA
C3
0.01u
FOUTA0
3.3V
R3
133
Zo = 50 Ohm
nFOUTA0
Zo = 50 Ohm
VCC
R9
VCC
R7
82.5
C4
10
10u
VCC=3.3V
VCCO=3.3V
R4
133
+
-
R8
82.5
MR
Zo = 50 Ohm
FOUTB0
+
Zo = 50 Ohm
nFOUTB0
-
R10
R11
50
50
Optional
R12
Y-Termination
50
REF_OUT
R13
33
Zo = 50 Ohm
FIGURE 9. 843034I-06 APPLICATION SCHEMATIC EXAMPLE
LVCMOS
843034I-06 REVISION B 8/20/15
17
©2015 Integrated Device Technology, Inc.