Analog Frequency Multiplier
VCXO Family of Products
CRYSTAL SPECIFICATIONS AND BOARD LAYOUT CONSIDERATIONS
BOARD LAYOUT CONSIDERATIONS
AFM IC
XTA
XIN (Pin # 4)
XOUT (Pin # 5)
AFM IC
XTAL
Ceramic
SMD
XIN (Pin # 4)
XOUT (Pin # 5)
To minimize parasitic effects, and improve performance:
•
Place the crystal as close as possible to the IC.
•
Make the board traces that are connected to the crystal pins symmetrical.
•
The board trace symmetry is important, as it reduces the negative parasitic effects, for a clean frequency multiplication with low
jitter. Parasitic have negative effect on frequency pulling of a VCXO and jitter.
CRYSTAL SPECIFICATIONS & TUNING PERFORMANCE
CRYSTAL SPECIFICATIONS
PART
NUMBER
CRYSTAL
RESONATOR
FREQUENCY
(FXIN)
TUNING PERFORMANCE
ESR
(R
E
)
Max.
CRYSTAL
FREQ
(MHz)
155.52
5pF
30
Ω
155.52
30.72
1.8pF
2.8pF
4.5pF
5.1pF
5.3pF
2.0pF
5.7fF
12.4fF
19.1fF
20.9fF
25.6fF
6.7fF
316
228
236
242
207
305
-134 ppm
-167ppm
-163ppm
-131ppm
-157ppm
-92ppm
+87 ppm
+176ppm
+167ppm
+98ppm
+141ppm
+110ppm
MOD
E
CL (xtal)
CONDI-
TIONS
At
Vcon
=
1.65V
TYP.
CRYSTAL
C0
3.0pF
C1
12.2fF
C0/C1
245
TUNING (Typical)
VC:
1.65V
0V
-145 ppm
VC:
1.65V 3.4V
+108 ppm
PL560-08/09
PL560-68/69
75~200MHz
Funda-
mental
PL560-
37/38/39
PL560-
47/48/49
30~80MHz
Funda-
mental
At
Vcon
=
1.65V
30.72
5pF
30
Ω
38.88
38.88
77.76
Note:
Non specified parameters can be chosen as standard values from crystal suppliers.
CL ratings larger than 5pF require a crystal frequency adjustment. Request detailed crystal specifications from PhaseLink.
47745 Fremont Blvd., Fremont, CA 94538 TEL (510) 492-0990, FAX (510) 492-0991
www.phaselink.com
Rev.:03-22-05 Page 4
PLL [ PHASELINK CORPORATION ]
