(Preliminary)

ABX8037/38/39

38-640MHz Low Phase Noise XO

30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 9/1/05 Page 1

FEATURES

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

• Less than 25ps peak to peak jitter for all

frequencies.

• Low phase noise output (@ 1MHz frequency

offset

∗ -144dBc/Hz for 106.25MHz

∗ -144dBc/Hz for 156.25MHz

∗ -144dBc/Hz for 212.5MHz

∗ -140dBc/Hz for 312.5MHz,

∗ -131dBC/Hz for 622.08MHz

• 19MHz-40MHz crystal input.

• 38MHz-640MHz output.

• Available in PECL, LVDS, or CMOS outputs.

• Output Enable selector.

• 2.5V & 3.3V operation.

• Available in 3x3 QFN or 16-pin TSSOP

packages.

DESCRIPTION

The ABX803X is a monolithic low jitter and low

phase noise high performance clock, capable of

maintaining 0.4ps RMS phase jitter and CMOS,

LVDS or PECL outputs, covering a wide frequency

output range up to 640MHz. It allows high

performance and high frequency output, using a low

cost fundamental crystal of between 19-40MHz.

The frequency selector pads of ABX803X enable

ABX803X is designed to address the demanding

requirements of high performance applications such

Fiber Channel, serial ATA, Ethernet, SAN, etc.

PACKAGE PIN ASSIGNMENT

16-pin TSSOP

3x3 QFN

Note1: QBAR is used for single ended CMOS output

.

Note2: ^ Denotes internal pull up resistor.

BLOCK DIAGRAM

1

2

3

4

5

6

7

8

VDDANA

9

10

11

12

13

14

15

16

XIN

XOUT

SEL2^

OE_CTRL

DNC

GNDANA

LP

SEL0^

GNDBUF

SEL1^

GNDBUF

QBAR

VDDBUF

Q

LM

Phase

Detector

Charge

Pump

Loop

Filter

VCO

VCO

Divider

XTAL

OSC

QBAR

OE

XIN

XOUT

Q

+

Performance Tuner

Output

Divider

(1,2,4,8)

ABX803X

GNDBUF

VDDBUF

Q

QBAR

SEL2^

XOUT

OE_CTRL

DNC

4

16

15

14

13

12

11

10

9

8

7

6

5

12

3