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RF Monolithics, Inc.

Phone: (972) 233-2903

Fax: (972) 387-9148

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.

RO2112-102699

Electrical Characteristics

Characteristic

Sym

Notes

Minimum

Typical

Maximum

Units

Center Frequency (+25 °C)

Absolute Frequency

2, 3, 4, 5

433.345

433.495

MHz

Tolerance from 433.420 MHz

∆f

C

±75

kHz

Insertion Loss

IL

2, 5, 6

1.3

1.5

dB

Quality Factor

Unloaded Q

5, 6, 7

10,800

50

Ω Loaded Q

1,300

Temperature Stability

Turnover Temperature

6, 7, 8

20

35

50

°C

Turnover Frequency

kHz

Frequency Temperature Coefficient

FTC

0.037

Frequency Aging

Absolute Value during the First Year

1

≤10

ppm/yr

DC Insulation Resistance between Any Two Pins

5

1.0

M

Ω

RF Equivalent RLC Model

Motional Resistance

5, 7, 9

16

19

Ω

Motional Inductance

63.4534

µH

Motional Capacitance

2.12504

fF

Pin 1 to Pin 2 Static Capacitance

5, 6, 9

2.0

2.3

2.6

pF

Transducer Static Capacitance

5, 6, 7, 9

2.0

pF

Test Fixture Shunt Inductance

2, 7

60

nH

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

RFM RO2112

TO39-3 Case

•

Ideal for European 433.92 MHz Superhet Receiver LOs

•

Very Low Series Resistance

•

Quartz Stability

•

Rugged, Hermetic, Low-Profile TO39 Case

The RO2112 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 local oscillators operating at approxi-

mately 433.42 MHz. The RO2112 is designed for IC based 433.92 MHz superhet receivers with 500 kHz IF

(Philips UAA3201T). Applications include remote-control and wireless security devices operating in Europe

under ETSI I-ETS 300 220 and in Germany under FTZ 17 TR 2100.

Absolute Maximum Ratings

Rating

Value

Units

CW RF Power Dissipation (See: Typical Test Circuit)

+0

dBm

DC Voltage Between Any Two Pins (Observe ESD Precautions)

±30

VDC

Case Temperature

-40 to +85

°C

433.42 MHz

SAW

Resonator

RO2112

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