PL560-37 Datasheet, PDF (4/15 Pages) Micrel Semiconductor – Analog Frequency Multiplier

Analog Frequency Multiplier
PL56X-XX VCXO Family
CRYSTAL SPECIFICATIONS AND BOARD LAYOUT CONSIDERATIONS
BOARD LAYOUT CONSIDERATIONS
XT AL
AFM IC
XIN (Pin # 4 )
XOUT (Pin # 5)
XTAL
Ceramic
SMD
AFM IC
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 to produce a clean
frequency multiplication with low jitter. Parasitic effects reduce frequency pulling of the VCXO and
increase jitter.
CRYSTAL SPECIFICATIONS & TUNING PERFORMANCE
CRYSTAL SPECIFICATIONS
PART
NUMBER
CRYSTAL
CL (xtal)
RESONATOR
FREQUENCY
MODE
CONDI-
(FXIN)
TIONS
TYP
TUNING PERFORMANCE
ESR
(RE)
CRYSTAL
MAX
CRYSTAL
FREQ (MHz)
C0
C1
TUNING (Typical)
C0/C1
VC:
VC:
1.65V 0V 1.65V 3.3V
PL565-08
PL560-09
PL560-68/69
75 to 200MHz
Funda-
mental
At
VCON =
1.65V
5pF
30Ω
155.52
155.52
3.0pF
1.8pF
12.2fF
5.7fF
245
316
-145 ppm
-134 ppm
+108 ppm
+87 ppm
30.72
2.8pF 12.4fF
228
-167ppm
+176 ppm
PL560-
37/38/39
PL560-
47/48/49
30 to 80MHz
Funda-
mental
At
VCON =
1.65V
5pF
30Ω
30.72
38.88
38.88
4.5pF 19.1fF
236
5.1pF 20.9fF
242
5.3pF 25.6fF
207
-163 ppm
-131 ppm
-157 ppm
+167 ppm
+98 ppm
+141 ppm
77.76
2.0pF 6.7fF
305
-92 ppm
+110 ppm
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 Micrel.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax [phone] • www.micrel.com Rev 11/04/11 Page 4