433.92 MHz

SAW Resonator

RF Monolithics, Inc.

Phone: (972) 233-2903

Fax: (972) 387-9148

E-mail: info@rfm.com

Page 2 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.

RP1308-110599

Electrical Connections

This two-port, three-terminal SAW resonator is bidirectional. However, im-

pedances and circuit board parasitics may not be symmetrical, requiring

slightly different oscillator component-matching values.

Typical Test Circuit

Typical Application Circuits

Case Design

Equivalent LC Model

Temperature Characteristics

Typical Frequency Response

Pin

Connection

1

Input or Output

2

Output or Input

3

Case Ground

Bottom View

Pin 1

Pin 2

Pin 3

50

Ω

Source at

F

C

Low-Loss

Matching

Network

50

Ω

to

Power Test

P

P

INCIDENT

INCIDENT

CW RF Power Dissipation =

-

REFLECTED

REFLECTED

P

P

1

3

2

2

3

1

From 50

Network

Analyzer

Ω

To 50

Network

Analyzer

Ω

Electrical Test

This SAW resonator can be used in oscillator or transmitter designs that

require 180° phase shift at resonance in a two-port configuration. One-

port resonators can be simulated, as shown, by connecting pins 1 and 2

together. However, for most low-cost consumer products, this is only

recommended for retrofit applications and not for new designs.

Phasing

& Match

Phasing

& Match

1

2

3

Conventional Two-Port Design:

Simulated One-Port Design:

B

45°

J

(2 places)

D

(3 places)

H

G

E

F

C

A

Dimensions

Millimeters

Inches

Min

Max

Min

Max

A

9.40

0.370

B

3.18

0.125

C

2.50

3.50

0.098

0.138

D

0.46 Nominal

0.018 Nominal

E

5.08 Nominal

0.200 Nominal

F

2.54 Nominal

0.100 Nominal

G

2.54 Nominal

0.100 Nominal

H

1.02

0.040

J

1.40

0.055

C

M

C o

C o

R

M

1

2

3

The following equivalent LC model is valid near resonance:

-80 -60 -40 -20

0 +20 +40 +60

0

-50

-100

-150

+80

-200

0

-50

-100

-150

-200

f

∆T = T

The curve shown on the right

accounts for resonator con-

tribution only and does not

include LC component tem-

perature contributions.

The plot shown below is a typical frequency response for the RP series of

two-port resonators. The plot is for RP1094.

-10.0

-20.0

-30.0

-40.0

-50.0

-60.0

200.0

100.0

0.0

-100.0

-200.0

-300.0

-400.0

-500.0

-600.0

-700.0

-800.0

901.2

905.2

909.2

913.2

917.2

921.2

925.2

929.2

Frequency (MHz)