CX2SM datasheet(2/2 Pages) STATEK

Part #	CX2SM

Description	Low Profile Miniature Surface Mount Quartz Crystal

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Manufacturer	STATEK [STATEK CORPORATION]

Direct Link	http://www.statek.com

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STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com

YS

TEM

CERTIFIC

AT

01

10135 - Rev B

SPECIFICATIONS

Specifications are typical at 25

OC unless otherwise noted.

Specifications are subject to change without notice.

Frequency Range

760 kHz - 1.35 MHz

Functional Mode

Extensional

Calibration Tolerance*

500 ppm (0.05%)

1000 ppm (0.1%)

10000 ppm (1.0%)

Load Capacitance

7 pF

Motional Resistance (R1)5 kΩ MAX

Motional Capacitance (C1) 1.2fF

Quality Factor (Q)

150 k

Shunt Capacitance (C0)

1.0 pF

Drive Level

3

µW MAX

Turning Point (T0)**

35

OC

Temperature Coefficient (k) -0.035 ppm/

OC2

Aging, first year

5 ppm MAX

Shock, survival

1000 g peak, 0.3 ms,1/2 sine

Vibration, survival

10 g RMS, 20-1,000 Hz random

Operating Temp. Range

-10

OC to +70OC (Commercial)

-40

OC to +85OC (Industrial)

-55

OC to +125OC (Military)

Storage Temp. Range

-55

OC to +125OC

Max Process Temperature

260

OC for 20 sec.

Note: Frequency f at temperature T is related to frequency f0

at turning point temperature T0 by:

*Tighter frequency calibration available.

** Other turning points available.

+

_

+

_

+

_

f-f0

=

k(T-T0)

2

f0

TERMINATIONS

Designation

Termination

SM1

Gold Plated

SM2

Solder Plated

SM3

Solder Dipped

PACKAGING OPTIONS

CX2SM

- Tray Pack

-16mm tape, 7” or 13” reels

(Reference tape and reel data sheet 10109)

HOW TO ORDER CX2SM CRYSTALS

CX2

S

C

SM1

1.0M,

500

/

M

TYPICAL APPLICATION

FOR A PIERCE OSCILLATOR

The low profile CX miniature surface mount crystal is ideal

for small, high density, battery operated portable products.

The CX crystal designed in a Pierce oscillator (single

inverter) circuit provides very low current consumption and

high stability. A conventional CMOS Pierce oscillator

circuit is shown below. The crystal is effectively inductive

and in a PI-network circuit with CD and CG provides the

additional phase shift necessary to sustain oscillation. The

oscillation frequency (f0) is 15 to 150 ppm above the

crystal’s series resonant frequency (fS).

Drive Level

RA is used to limit the crystal’s drive level by forming a

voltage divider between RA and CD. RA also stabilizes the

oscillator against changes in the amplifiers output

resistance (R0). RA should be increased for higher

voltage operation.

Load Capacitance

The CX crystal calibration tolerance is influenced by the

effective circuit capacitances, specified as the load

capacitance (CL). CL is approximately equal to:

NOTE: CD and CG include stray layout to ground and CS

is the stray shunt capacitance between the crystal

terminal. In practice, the effective value of CL will be less

than that calculated from CD, CG and CS values because

of the effect of the amplifier output resistance. CS should

be minimized.

The oscillation frequency (f0) is approximately equal to:

CONVENTIONAL CMOS

PIERCE OSCILLATOR CIRCUIT

AMPLIFIER

BUFFER

C

G

C

D

R

A

CX2

OSC

Freq (f )

O

R

f

f0 = fS

[1+

C

1

]

2(C0 + CL)

(2)

Where f

S

= Series resonant frequency of the crystal

C1 = Motional Capacitance

C0 = Shunt Capacitance

CL =

CD x CG

+

CS

CD + CG

(1)

“S” if special or

custom design.

Blank if Std.

Blank = Glass Lid

C = Ceramic Lid

SM1 = Gold Plated

SM2 = Solder Plated

SM3 = Solder Dipped

Frequency

K = kHz

M = MHz

Calibration

Tolerance

@ 25

OC

(in ppm)

Operating Temp. Range:

C= -10

OC to +70OC

I= -40

OC to +85OC

M= -55

OC to +125OC

S= Customer Specified

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