83PR226I-01 Datasheet, PDF (15/22 Pages) Integrated Device Technology – Programmable FemtoClock LVPECL Oscillator Replacement

83PR226I-01 Datasheet
Schematic Example
Figure 6 shows an example of 83PR226I-01 application schematic. In this example, the device is operated at V_CC = 3.3V. 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. Two examples of LVPECL termination are shown in this schematic.
Additional termination approaches are shown in the LVPECL Termination Application Note.
U1
M1
1
M0
2
3
M1
M0
VEE
VCC
VCC
8
VCC
nQ
Q
7
6
C3
0.1uF
Q
nQ
ICS83PR226I-01
C2
27pF
X1
25MH₁ z_{8 p F}
XTAL_IN
XTAL_OUT
C1
27pF
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
3.3V
R2
133
Zo = 50 Ohm
R3
133
+
Zo = 50 Ohm
-
R4
82.5
R5
82.5
VCC=3.3V
Zo = 50 Ohm
Zo = 50 Ohm
R6
50
+
-
R7
50
Optional
R8
Y-Termination
50
Figure 6. 83PR226I-01 Schematic Example
©2017 Integrated Device Technology, Inc.
15
April 13, 2017