CX4 datasheet(2/2 Pages) STATEK

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CX4

SM1

1.8432M

500

TYPICAL APPLICATION

FOR A PIERCE OSCILLATOR

The CX4 family of surface mount crystals are ideal for

small, high density, battery operated portable products. The

CX4 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 50 to 250 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 CX4 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:

AMPLIFIER

BUFFER

CX4

XTAL

OSC

Freq (f )

CONVENTIONAL CMOS

PIERCE OSCILLATOR CIRCUIT

f0 = fS

[1+

]

2(C0 + CL)

(2)

Where f

= Series resonant frequency of the crystal

C1 = Motional Capacitance

C0 = Shunt Capacitance

CL =

CD x CG

CD + CG

(1)

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

TEM

CERTIFIC

10161 Rev A

HOW TO ORDER CX4 CRYSTALS

C = Ceramic Lid

Blank = Glass Lid

“S” if special or

custom design.

Blank if standard

SM1 = Gold Plated

SM2 = Solder Plated

SM3 = Solder Dippe

Operating Temp. Range:

C= -10

OC to +70OC

I= -40

OC to +85OC

M= -55

OC to +125OC

S= Customer Specified

Frequency

K = kHz

M = MHz

Calibration

Tolerance

@25

(in ppm)

SPECIFICATIONS

Specifications are typical at 25

OC unless otherwise noted.

Specifications are subject to change without notice.

Parameters

Fundamental

Overtone

Frequency, (Hz)

600 K 1.0 M

1.4 M 1.8432 M 2.4576 M

Motional Resistance, R1 (Ω)

300

400

600

500

1000

Motional Resistance, R1 MAX

Ω

Motional Capacitance, C1 (fF)

3.5

2.0

1.3

3.5

1.5

Quality Factor, Q (k)

250

200

150

Shunt Capacitance, C0 (pF)

1.0

0.8

0.7

1.0

0.8

Standard Calibration

500 ppm ( 0.05%)

Tolerance*

1000 ppm ( 0.1%)

10000 ppm ( 1.0%)

Drive Level

µW MAX

Load Capacitance, CL**

7pF

Turning Point, T0**

Temperature Coefficient, k

-0.035 ppm/

OC2 TYP

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

turning point temperature T0 by:

Functional Mode

Extensional

Aging, first year

5ppm MAX

Shock, survival

1500 g peak, 0.3 ms, 1/2 sine

Vibration, survival

20 g RMS, 10-2,000 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.

*Tighter tolerances available

**Other values available

NOTE: All values subject to change without notice.

f-f0

k(T-T0)

PACKAGING OPTIONS

CX4

- Tray Pack

- Tape and Reel

(Reference tape and reel data sheet 10109)

TERMINATIONS

Designation

Termination

SM1

Gold Plated

SM2

Solder Plated

SM3

Solder Dipped

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