Analog Frequency Multiplier

PL56X-XX VCXO Family

CRYSTAL SPECIFICATIONS AND BOARD LAYOUT CONSIDERATIONS

BOARD LAYOUT CONSIDERATIONS

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

TUNING PERFORMANCE

PART

NUMBER

CRYSTAL

RESONATOR

FREQUENCY

(FXIN)

MODE

CL (xtal)

ESR

CRYSTAL

TUNING (Typical)

CONDI-

TIONS

TYP

MAX

CRYSTAL

FREQ (MHz)

C0

C1

C0/C1

VC:

1.65V

0V

VC:

1.65V

3.3V

PL565-08

PL560-09

PL560-68/69

75 to 200MHz Funda-

mental

At

VCON =

1.65V

5pF

30Ω

155.52

3.0pF

12.2fF

245

-145 ppm

+108 ppm

155.52

1.8pF

5.7fF

316

-134 ppm

+87 ppm

PL560-

37/38/39

PL560-

47/48/49

30 to 80MHz

Funda-

mental

At

VCON =

1.65V

5pF

30Ω

30.72

2.8pF

12.4fF

228

-167ppm

+176 ppm

30.72

4.5pF

19.1fF

236

-163 ppm

+167 ppm

38.88

5.1pF

20.9fF

242

-131 ppm

+98 ppm

38.88

5.3pF

25.6fF

207

-157 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.

XTAL

XTAL

Ceramic

SMD

AFM IC

XIN ( P in # 4 )

XOUT (P in # 5)

AFM IC

XIN ( P in # 4 )

XOUT (P in # 5)