CX-2-SM2FREQ(A/M) [EUROQUARTZ]

Quartz Crystal, QUARTZ CRYSTAL RESONATOR, 0.76 MHz - 1.35 MHz, HERMETIC SEALED, LEADLESS, SMD, 2 PIN;


型号：	CX-2-SM2FREQ(A/M)
厂家：	EUROQUARTZ LIMITED
描述：	Quartz Crystal, QUARTZ CRYSTAL RESONATOR, 0.76 MHz - 1.35 MHz, HERMETIC SEALED, LEADLESS, SMD, 2 PIN
文件：	总2页 (文件大小：99K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

CX MINIATURE CRYSTALS

EUROQUARTZ

Telephone:

Fax:

+44(0)1460 230000

+44(0)1460 230001

sales@euroquartz.co.uk

www.euroquartz.co.uk

Page

CX-2-SM

760kHz to 1.35MHz 1 of 2

Email:

Web:

LLOOWW--PPRROOFFIILLEE

SSMMDD CCRRYYSSTTAALL

Extensional mode

High shock resistance

Designed for low-power applications

Compatible with hybrid or PC board packaging

Low ageing

Full military environmental testing available

Ideal for battery operated applications

General Description

The miniature CX-2-SM quartz crystal is a high quality leadless

device suitable for mounting on printed circuit boards or hybrid

substrates. The CX-2-SM is hermetically sealed in a rugged,

leadless ceramic package. The crystal has been designed for

surface-mounting on printed circuit boards or hybrid circuits. The

crystal is manufactured using a photo-lithographic process,

yielding consistently high quality production parts.

Specification

Frequency Range:

Functional Mode:

Calibration Tolerance*:

760kHz to 1.35MHz

Extensional

±0.05% (±500ppm)

±0.1%

±1.0%

Load Capacitance:

7pF

Motional Resistance (R ):

Motional Capacitance (C ):

Quality Factor (Q):

5k max.

1.2fF

150k

Terminal 1 is electrically connected to terminal 3

Outline

Shunt Capacitance (C ):

Drive Level:

Turning Point (T )**:

1.0pF

3 W max.

35°C

CX-2-SM Package Dimensions

Note: Frequency (f) deviation from frequency (f ) @ turning point

temperature (T ):

Typical

(mm)

Maximum

(mm)

f-fo

Dimension

k(T-To)

-0.035ppm/°C

±5ppm max.

Temperature Coefficient:

Ageing, first year:

Shock, survival:

Vibration, survival:

Operating Temperature:

6.60

2.39

6.99

2.74

1000g 0.3ms, ½ sine

10g rms, 20-1,000Hz random

-10°~+70°C (commercial)

-40°~+85°C (industrial)

-55°~+125°C (military)

-55°C~+125°C

see below

1.14

0.89

1.50

1.27

2.67

3.94

5.33

1.75

Storage Temperature:

Process Temperature:

1.52

260°C for 20 seconds

2.92

Specifications are typical at 25°C unless otherwise indicated.

4.19

Tighter frequency calibration available

Other turning point available

5.59

Dimension

“C”

Glass Lid

(mm max.)

Ceramic Lid

(mm max.)

SM1

SM2

SM3

1.65

1.70

1.78

1.91

1.96

2.03

Equivalent Circuit

Solder Pad Layout

2.67

2.87

Motional Resistance

Motional Capacitance

Motional Inductance

Shunt Capacitance

0.6

CX MINIATURE CRYSTALS

EUROQUARTZ

Telephone:

Fax:

+44(0)1460 230000

+44(0)1460 230001

sales@euroquartz.co.uk

www.euroquartz.co.uk

Page

CX-2-SM

760kHz to 1.35MHz 2 of 2

Email:

Web:

LLOOWW--PPRROOFFIILLEE

SSMMDD CCRRYYSSTTAALL

Circuit Design

Typical Pierce Oscillator Application

Conventional HCMOS Pierce Oscillator Circuit

The low profile CX miniature surface-mount crystal is ideal for small,

battery operated portable products. The CX crystal design in a Pierce

oscillator (single inverter) circuit has a very low current consumption

with high stability. A conventional HCMOS Pierce oscillator circuit is

shown below. The crystal is effectively inductive and in a Pi network

with C and C which provides the additional phase-shift necessary

to sustain oscillation. The oscillation frequency (f ) is 15ppm to

150ppm above the crystal’s series resonant frequency (F ).

Amplifier

Buffer

Osc.

Freq. (Fo)

Drive Level

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

divider between R and C . R also stabilizes the oscillator against

changes in the amplifiers output resistance (R ). R should be

increased for higher voltage operation.

CX-2

Load Capacitance

The CX crystal calibration tolerance is influenced by the effective

circuit capacitances, specified as the load capacitance (C .) C is

approximately equal to:

C x C

C + C

NOTE: C and C include stray layout capacitance to ground. C is

the stray shunt capacitance between the crystal terminals. In

practice, the effective valus of C will be less than that calculated

from C , C , and CS values due to the effect of the amplifier output

resistance. C should be minimized.

The oscillation frequency (f ) is approximately equal to:

2(C + C )

Where F = Series resonant frequency of the crystal

C = Motional Capacitance

C = Shunt Capacitance

Terminations

Termination

Designation

Packaging

CX-2-SM - Bulk Pack (Standard)

- 16mm tape, 178mm or 330mm reels (Optional)

per EIA 481

SM1

SM2

SM3

Gold Plated

Nickel, Solder Plated

- Tray Pack (Optional)

Nickel, Solder Plated and Solder Dipped

Order Code

C = Ceramic Lid

Blank = Glass Lid

Frequency

CX-2

( A /

I )

-SM1 1.0MHz

“S” if special

or custom design

Blank if standard

Temperature

Range:

C = Commercial

I = Industrial

M = Military

S = Specify

SM1

SM2

SM3

Calibration

Tolerance*

@ 25°C

A, B, C

*For other calibration

tolerances enter

figure in ppm

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