PLL502-02

Low Phase Noise VCXO (24MHz to 50MHz)

47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 12/14/05 Page 1

FEATURES

• Low phase noise VCXO output for the 24MHz to

50MHz range (-130 dBc at 10kHz offset).

• CMOS output.

• 12 to 25MHz crystal input.

• Integrated variable capacitors.

• Selectable High Drive (30mA) or Standard Drive

(10mA) output.

• Wide pull range (+/- 250 ppm typ.).

• Low jitter (RMS): 3ps period (1 sigma).

• 3.3V operation.

• Available in 8-Pin SOIC.

DESCRIPTION

The PLL502-02 is a low cost, high performance, low

phase noise VCXO, providing less than -130dBc at

10kHz offset in the 24MHz to 50MHz operating

range. The very low jitter (3 ps RMS period jitter)

makes this chip ideal for applications requiring volt-

age controlled frequency sources. Input crystal can

range from 12 to 25MHz (fundamental resonant

mode).

PIN CONFIGURATION

OUTPUT RANGE

MULTIPLIER

FREQUENCY

RANGE

OUTPUT

BUFFER

x2

24 - 50MHz

CMOS

BLOCK DIAGRAM

Reference

Divider

Phase

Comparator

Charge

Pump

Loop

Filter

VCO

VCO

Divider

XTAL

OSC

OE

XIN

XOUT

CLK

VCON

VARICAP

1

2

3

45

6

7

8

XOUT

N/C

VCON

GND

XIN

VDD

CLK

N/C