Analog Frequency Multiplier

VCXO Family of Products

47745 Fremont Blvd., Fremont, CA 94538 TEL (510) 492-0990, FAX (510) 492-0991

www.phaselink.com

Rev.:03-22-05 Page 4

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, 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

TUNING PERFORMANCE

CL (xtal)

ESR

CRYSTAL

TUNING (Typical)

PART

NUMBER

CRYSTAL

RESONATOR

FREQUENCY

(FXIN)

MOD

E

CONDI-

TIONS

TYP.

Max.

CRYSTAL

FREQ

(MHz)

C0

C1

C0/C1

VC:

1.65V

0V

VC:

1.65V

3.4V

155.52

3.0pF

12.2fF

245

-145 ppm

+108 ppm

PL560-08/09

PL560-68/69

75~200MHz

Funda-

mental

At

Vcon

=

1.65V

5pF

30

Ω

155.52

1.8pF

5.7fF

316

-134 ppm

+87 ppm

30.72

2.8pF

12.4fF

228

-167ppm

+176ppm

30.72

4.5pF

19.1fF

236

-163ppm

+167ppm

38.88

5.1pF

20.9fF

242

-131ppm

+98ppm

38.88

5.3pF

25.6fF

207

-157ppm

+141ppm

PL560-

37/38/39

PL560-

47/48/49

30~80MHz

Funda-

mental

At

Vcon

=

1.65V

5pF

30

Ω

77.76

2.0pF

6.7fF

305

-92ppm

+110ppm

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.

XTA

XTAL

Ceramic

SMD

AFM IC

XIN (Pin # 4)

XOUT (Pin # 5)

AFM IC

XIN (Pin # 4)

XOUT (Pin # 5)