MK3721

Low Cost 3.3 Volt VCXO

MDS 3721 B

2

Revision 082800

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA • 95126• (408)295-9800tel • www.icst.com

I C R O

Pin Descriptions

Pin Assignment

Number

Name

Description

1

X1

Crystal connection. Connect to a pullable 16.2 - 28 MHz crystal.

2

VDD

VDD. Connect to + 3.3 V.

3

VIN

Voltage input to VCXO. Zero to 3.3 V analog input which controls the frequency of the VCXO.

4

GND

Connect to ground.

5

DC

Don't Connect anything to this pin.

6

REFOUT VCXO CMOS level clock output matches the nominal frequency of the crystal.

7

DC

Don't Connect anything to this pin.

8

X2

Crystal connection. Connect to a pullable 16.2 - 28 MHz crystal.

8 pin (150 mil) SOIC

MK3721

1

8

2

3

4

7

6

5

X2

X1

GND

VDD

DC

VIN

DC

REFOUT (VCXO)

Crystal Specifications

Correlation (load) capacitance

14 pF

Initial accuracy

±20 ppm maximum

Drift over temperature and aging

±50 ppm maximum

C0/C1 ratio

240 maximum

ESR

35

Ω maximum