ICS843021I-01 Datasheet, PDF (10/15 Pages) Integrated Circuit Systems – FEMTOCLOCKS-TM CRYSTAL-TO-3.3V, 2.5V 125MHZ LVPECL CLOCK GENERATOR

ICS843021I-01
FEMTOCLOCKS™CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
Schematic Example
Figure 5 shows an example of ICS843021I-01 application
schematic. In this example, the device is operated at V_CC = 3.3V.
The decoupling capacitor should be located as close as possible
to the power pin. The input is driven by a 25MHz quartz crystal. 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.
VCC = 3.3V
X1
25MHz
S)
C2
27pF
C1
27pF
U1
1
2 ^VCC
3
4
XTAL_OUT
XTAL_IN
VEE
8
Q7
nQ
VCC
OE
6
5
OE
843021I-01
3.3V
R3
R5
133
133
Zo = 50 Ohm
+
Zo = 50 Ohm
-
R4
R6
82.5
82.5
VCC
C3
C4
C5
10uF .1uF .1uF
Figure 5. ICS843021I-01 Schematic Example
Figure 5. ICS843021I-01 Schematic Example
Zo = 50
+
Zo = 50
-
R2
R1
50
50
R3
50
Optional Termination
IDT™ / ICS™ 3.3V , 2.5V LVPECL CLOCK GENERATOR
10
ICS843021AGI-01 REV. A DECEMBER 3, 2007