®

RF Monolithics, Inc.

Phone: (972) 233-2903

Fax: (972) 387-8148

E-mail: info@rfm.com

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RFM Europe

Phone: 44 1963 251383

Fax: 44 1963 251510

http://www.rfm.com

©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.

RO2122A-062001

Electrical Characteristics

Characteristic

Sym

Notes

Minimum

Typical

Maximum

Units

Frequency (+25 °C)

Nominal Frequency

2, 3, 4, 5

293.025

293.225

MHz

Tolerance from 293.125 MHz

∆f

C

±100

kHz

Insertion Loss

IL

2, 5, 6

0.8

1.5

dB

Quality Factor

Unloaded Q

5, 6, 7

17,500

50

Ω Loaded Q

1,600

Temperature Stability

Turnover Temperature

6, 7, 8

10

25

40

°C

Turnover Frequency

Frequency Temperature Coefficient

FTC

0.032

Frequency Aging

Absolute Value during the First Year

1, 6

10

ppm/yr

DC Insulation Resistance between Any Two Terminals

5

1.0

M

Ω

RF Equivalent RLC Model

Motional Resistance

5, 6, 7, 9

10

19

Ω

Motional Inductance

94.3270

µH

Motional Capacitance

3.12428

fF

Transducer Static Capacitance

5, 6, 9

2.9

3.2

3.5

pF

Test Fixture Shunt Inductance

2, 7

90

nH

Lid Symbolization

116

•

Ideal for 303.825 MHz Superhet Receiver LOs

•

Very Low Series Resistance

•

Quartz Stability

•

•

Complies with Directive 2002/95/EC (RoHS)

The RO2122A is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount, ceramic case.

It provides reliable, fundamental-mode, quartz frequency stabilization of local oscillators operating at approx-

imately 293.125 MHz. This SAW is designed for 303.825 MHz superhet receivers with 10.7 MHz IF. Appli-

cations include remote-control and wireless security receivers operating in the USA under FCC Part 15, in

Japan, in Korea, and in Australia.

Absolute Maximum Ratings

Rating

Value

Units

CW RF Power Dissipation

+0

dBm

DC Voltage Between Terminals

±30

VDC

Case Temperature

-40 to +85

°C

Soldering Temperature (10 seconds / 5 cycles max.)

260

°C

293.125 MHz

SAW

Resonator

RO2122A

CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.

Notes:

1.

Aging may exceed the specification for prolonged temperatures above +65°C.

Typically, aging is greatest the first year after manufacture, decreasing in subse-

quent years.

2.

3.

One or more of the following United States patents apply: 4,454,488 and

4,616,197.

4.

Typically, equipment utilizing this device requires emissions testing and govern-

ment approval, which is the responsibility of the equipment manufacturer.

5.

6.

The design, manufacturing process, and specifications of this device are subject

to change without notice.

7.

Derived mathematically from one or more of the following directly measured

8.

9.

This equivalent RLC model approximates resonator performance near the reso-

static (nonmotional) capacitance between the two terminals measured at low

frequency (10 MHz) with a capacitance meter. The measurement includes para-

sitic capacitance with "NC” pads unconnected. Case parasitic capacitance is

approximately 0.05 pF. Transducer parallel capacitance can by calculated as:

SM-2 Case