674.03 MHz
Electrical Connections
SAW Resonator
Equivalent LC Model
The following equivalent LC model is valid near resonance:
1
2
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.
L
M
R
M
C
M
Co
3
Pin
1
2
3
Connection
Input or Output
Output or Input
Case Ground
Pin 1
Bottom View
Pin 2
Co
Pin 3
Temperature Characteristics
The curve shown on the right
accounts for resonator con-
tribution only and does not
include LC component tem-
perature contributions.
f
C
= f
O
, T
C
= T
O
0
(f-fo ) / fo (ppm)
0
-50
-100
-150
-200
0 +20 +40 +60 +80
Typical Test Circuit
Power Test
P
INCIDENT
1
2
-50
-100
Electrical Test
From 50
Ω
Network
Analyzer
To 50
Ω
Network
Analyzer
-150
-200
-80 -60 -40 -20
50
Ω
Source at
P
REFLECTED
F
C
Low-Loss
Matching
Network
to 50
Ω
3
1
2
3
∆
T = T
C
- T
O
( °C )
-P
CW RF Power Dissipation = P
REFLECTED
INCIDENT
Typical Frequency Response
The plot shown below is a typical frequency response for the RP series of
two-port resonators. The plot is for RP1094.
-10.0
200.0
100.0
-20.0
0.0
-100.0
-30.0
-200.0
-300.0
-40.0
-400.0
-500.0
-50.0
-600.0
-700.0
1
Typical Application Circuits
S21 magn.(dB)
Conventional Two-Port Design:
Simulated One-Port Design:
-60.0
2
-800.0
905.2
909.2
913.2
917.2
921.2
925.2
929.2
Frequency (MHz)
901.2
Phasing
& Match
Phasing
& Match
3
Case Design
C
B
H
F
A
D
(3 places)
J
(2 places)
E
G
Millimeters
Dimensions
Min
A
B
C
D
E
F
G
H
45°
Inches
Min
Max
0.370
0.125
0.098
0.138
0.018 Nominal
0.200 Nominal
0.100 Nominal
0.100 Nominal
0.040
0.055
Max
9.40
3.18
2.50
3.50
0.46 Nominal
5.08 Nominal
2.54 Nominal
2.54 Nominal
1.02
1.40
J
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-9148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: info@rfm.com
http://www.rfm.com
RP1032-102699
Page 2 of 2
S21 phase (deg.)
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.
RFM [ RF MONOLITHICS, INC ]
