423.22 MHz
SAW Resonator
Electrical Connections
Equivalent LC Model
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.
The following equivalent LC model is valid near resonance:
2
1
L
M
C
R
o
M
M
C
C
o
Bottom View
Pin
Connection
3
Pin 1
Pin 2
Pin 3
1
2
3
Input or Output
Output or Input
Case Ground
Temperature Characteristics
fC = fO , TC = TO
0
The curve shown on the right
accounts for resonator con-
tribution only and does not
include LC component tem-
0
-50
-50
Typical Test Circuit
-100
-100
perature contributions.
-150
-150
-200
Power Test
Electrical Test
-200
-80 -60 -40 -20
0
+40 +60 +80
+20
To 50
Network
Analyzer
Ω
From 50
Network
Analyzer
Ω
2
P
1
INCIDENT
T = TC - TO ( °C )
Δ
Low-Loss
Matching
Network
2
3
1
50
Ω
Source at
P
REFLECTED
F
C
to50
Ω
3
-
CW RF Power Dissipation =
P
P
Typical Frequency Response
REFLECTED
INCIDENT
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
Typical Application Circuits
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
-100.0
-200.0
-300.0
-400.0
-500.0
-600.0
-700.0
-800.0
together. However, for most low-cost consumer products, this is only
recommended for retrofit applications and not for new designs.
Conventional Two-Port Design:
Simulated One-Port Design:
1
2
901.2
905.2
909.2
913.2
917.2
921.2
925.2
929.2
Frequency (MHz)
Phasing
& Match
Phasing
& Match
3
Millimeters
Inches
Dimensions
Case Design
Min
Max
Min
Max
A
B
C
D
E
F
9.40
3.18
3.50
0.370
0.125
0.138
C
G
B
2.50
0.098
H
0.46 Nominal
0.018 Nominal
0.200 Nominal
0.100 Nominal
0.100 Nominal
F
E
A
5.08 Nominal
2.54 Nominal
2.54 Nominal
D
(3 places)
G
H
J
1.02
0.040
J
(2 places)
45°
1.40
0.055
RF Monolithics, Inc.
RFM Europe
Phone: (972) 233-2903
Phone: 44 1963 251383
Fax: (972) 387-9148
Fax: 44 1963 251510
E-mail: info@rfm.com
http://www.rfm.com
RP1298-2-010713
Page 2 of 2
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
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