PLL502-05

Low Phase Noise VCXO (12MHz to 25MHz)

47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 09/17/04 Page 1

FEATURES

• Low phase noise VCXO output for the 12MHz to

25MHz range (-135 dBc at 10kHz offset).

• CMOS output.

• 12 to 25MHz crystal input.

• Integrated variable capacitors.

• Wide pull range (+/- 300 ppm).

• Low jitter (RMS): 2.2ps period.

• 2.5 or 3.3V operation voltage.

• Available in 8-Pin SOIC.

DESCRIPTION

The PLL502-05 is a low cost, high performance and

low phase noise VCXO, providing less than -135dBc

at 10 kHz offset in the 12MHz to 25MHz operating

range. The very low jitter (2.2ps 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

Note: ^ denotes internal pull up

OUTPUT RANGE

MULTIPLIER

FREQUENCY

RANGE

OUTPUT

BUFFER

No PLL

12 - 25MHz

CMOS

BLOCK DIAGRAM

1

2

3

45

6

7

8

XOUT

N/C

VCON

GND

XIN

VDD

CLK

OE^

Reference

Divider

Phase

Comparator

Charge

Pump

Loop

Filter

VCO

VCO

Divider

XTAL

OSC

OE

XIN

XOUT

CLK

VCON

VARICAP