PLL520-28/-29

Low Phase Noise VCXO (for 120-200MHz Fund Xtal)

47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 09/20/04 Page 1

FEATURES

• 120MHz to 200MHz Fundamental Mode Crystal.

• Output range: 120 – 200MHz (no PLL).

• Low Injection Power for crystal 50uW.

• Sub 0.5pS RMS phase jitter ( 12kHz to 20MHz ).

• PECL (PLL520-28) or LVDS output (PLL520-29).

• Integrated variable capacitors.

• Supports 2.5V or 3.3V-Power Supply.

• Available in 16-Pin (TSSOP or 3x3mm QFN).

DESCRIPTION

The PLL520-28/-29 are a family of VCXO IC’s

specifically designed to pull high frequency

fundamental crystals. They achieve very low current

into the crystal resulting in better overall stability.

Their internal varicaps allow an on chip frequency

pulling, controlled by the VCON input. Their very

low jitter makes them ideal for the most demanding

timing requirements.

BLOCK DIAGRAM

PIN CONFIGURATION

(Top View)

OUTPUT ENABLE LOGICAL LEVELS

Part #

OE

State

0 (Default)

Output enabled

PLL520-28

1

Tri-state

0

Tri-state

PLL520-29

1 (Default)

Output enabled

OE input: Logical states defined by PECL levels for PLL520-28

Logical states defined by CMOS levels for PLL520-29

1

2

3

4

5

6

7

8

VDD

9

10

11

12

13

14

15

16

XIN

XOUT

N/C

N/C

OE

VCON

GND

N/C

N/C

GND

CLKC

VDD

CLKT

N/C

N/C

XIN

XOUT

OE

Q

PLL520-28/-29

VCON

Q

Oscillator

Amplifier

w/

integrated

varicaps

P520-2x

GND

VDD

CLKT

CLKC

XOUT

XIN

N/C

OE

4

16

15

14

13

12

11

10

9

8

7

6

5

12

3