®

Preliminary

RF Monolithics, Inc.

Phone: (972) 233-2903

Fax: (972) 387-8148

E-mail: info@rfm.com

Page 1 of 2

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.

RO2044-082802

Electrical Characteristics

Characteristic

Sym

Notes

Minimum

Typical

Maximu

Units

Frequency (+25 °C)

Nominal Frequency

2, 3, 4, 5

317.900

318.100

MHz

Tolerance from 318.000 MHz

∆f

C

±100

kHz

Insertion Loss

IL

2, 5, 6

2.4

5.0

dB

Quality Factor

Unloaded Q

5, 6, 7

10400

50

Ω Loaded Q

2400

Temperature Stability

Turnover Temperature

6, 7, 8

29

44

59

°C

Turnover Frequency

kHz

Frequency Temperature Coefficient

FTC

0.037

Frequency Aging

Absolute Value during the First Year

|fA|

1, 6

10

ppm/yr

DC Insulation Resistance between Any Two Pins

5

1.0

M

Ω

RF Equivalent RLC Model

Motional Resistance

5, 6, 7, 9

32

78

Ω

Motional Inductance

160.269

µH

Motional Capacitance

1.56292

fF

Pin 1 to Pin 2 Static Capacitance

5, 6, 9

2.9

3.2

3.6

pF

Transducer Static Capacitance

5, 6, 7, 9

3.0

pF

Test Fixture Shunt Inductance

2, 7

78

nH

Lid Symbolization (in addition to Lot and/or Date Codes)

RFM // RO2044 // YWWS##

TO39-3 Case

•

Designed for 318 MHz Transmitter Applications

•

Low Series Resistance

•

Quartz Stability

•

Rugged, Hermetic, Low-Profile TO39 Case

•

Complies with Directive 2002/95/EC (RoHS)

The RO2044 is a true one-port, surface-acoustic-wave (SAW) resonator in a low-profile TO39 case. It pro-

vides reliable, fundamental-mode quartz frequency stabilization of fixed-frequency transmitters operating at

or near 318 MHz. The RO2044 is designed specifically for remote-control and wireless security AM transmit-

ters operating in the USA under FCC Part 15, in Canada under Doc RSS-210, and in Australia.

Absolute Maximum Ratings

Rating

Value

Units

CW RF Power Dissipation

+0

dBm

DC Voltage Between Terminals (Observe ESD Precautions)

±30

VDC

Case Temperature

-40 to +85

°C

318.00 MHz

SAW

Resonator

RO2044

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 signifi-

cantly in subsequent years.

2.

with the resonator in the 50

Ω test system (VSWR ≤ 1.2:1). The shunt induc-

3.

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

4,616,197 and others pending.

4.

Typically, equipment designs utilizing this device require emissions testing and

government 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 pin1 and pin 2 measured at low fre-

quency (10 MHz) with a capacitance meter. The measurement includes case

parasitic capacitance with a floating case. For usual grounded case applica-

tions (with ground connected to either pin 1 or pin 2 and to the case), add

Pb