(Preliminary)

PL580-37/38/39

38MHz-320MHz Low Phase Noise VCXO

47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 09/29/05 Page 1

FEATURES

• Less than 0.4ps RMS (12KHz-20MHz) phase

• Less than 25ps (typ.) peak to peak jitter for all

frequencies.

• Low phase noise output (@ 1MHz frequency

offset

∗ -144dBc/Hz for 155.52MHz

∗ -140dBC/Hz for 311.04MHz

• 19MHz-40MHz crystal input.

• 38MHz-320MHz output.

• Available in PECL, LVDS, or CMOS outputs.

• No external varicap required.

• Output Enable selector.

• Wide pull range (+/-200ppm).

• 3.3V operation.

• Available in 3x3 QFN or 16-pin TSSOP

packages.

DESCRIPTION

The PL580-3X is a monolithic low jitter and low

phase noise VCXO, capable of 0.4ps RMS phase

jitter and CMOS, LVDS, or PECL outputs, covering a

wide frequency output range up to 320MHz. It allows

the control of the output frequency with an input

voltage (VCON), using a low cost crystal.

The frequency selector pads of PL580-3X enable

PL580-3X is designed to address the demanding

requirements of high performance applications such

as SONET, GPS, Video, etc.

BLOCK DIAGRAM

PACKAGE PIN ASSIGNMENT

16-pin TSSOP

3x3 QFN

Note1: QBAR is used for single ended CMOS output

.

Note2: ^ Denotes internal pull up resistor.

1

2

3

4

5

6

7

8

VDDANA

9

10

11

12

13

14

15

16

XIN

XOUT

SEL2^

OE_CTRL

VCON

GNDANA

LP

SEL0^

GNDBUF

SEL1^

GNDBUF

QBAR

VDDBUF

Q

LM

PL580-3X

GNDBUF

VDDBUF

Q

QBAR

SEL2^

XOUT

OE_CTRL

VCON

4

16

15

14

13

12

11

10

9

8

7

6

5

12

3

Phase

Detector

Charge

Pump

Loop

Filter

VCO

VCO

Divider

XTAL

OSC

QBAR

OE

XIN

XOUT

Q

VCON

VARICAP

+

Performance Tuner

Output

Divider

(1,2,4,8)