RP Series TO39 Two-Port SAW Resonators
Electrical Connections
Temperature Characteristics
This two-port, three-terminal SAW resonator is bidirectional.
However, impedances and circuit board parasitics may not be
symmetrical, requiring slightly different oscillator componentmatching values.
The curve shown on the
right accounts for resonator contribution only and
does not include LC component temperature contributions.
Pin
Connection
1
2
3
Input or Output
Output or Input
Case Ground
Pin 1
0
-50
-50
-100
-100
-150
-150
(f-fo ) / fo (ppm)
Bottom View
fC = f O , T C = T O
0
-200
-80 -60 -40 -20
-200
0 +20 +40 +60 +80
∆T = TC - T O ( °C )
Pin 2
Typical Frequency Response
Pin 3
The plot shown below is a typical frequency response for the
RP series of two-port resonators. The plot is for RP1094.
Typical Test Circuit
-10.0
200.0
Power Test
100.0
-20.0
-100.0
3
-P
CW RF Power Dissipation = P
REFLECTED
INCIDENT
-200.0
-30.0
-300.0
-400.0
-40.0
S21 phase (deg.)
50 Ω
Source at P
REFLECTED
F
C
0.0
2
1
Low-Loss
Matching
Network
to 50 Ω
S21 magn.(dB)
P
INCIDENT
-500.0
Electrical Test
From 50Ω
Network
Analyzer
1
2
-600.0
-50.0
To 50Ω
Network
Analyzer
-700.0
-60.0
3
-800.0
901.2
905.2
909.2
913.2
917.2
921.2
925.2
929.2
Frequency (MHz)
Typical Application Circuits
Case Design
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.
C
G
B
H
F
E
A
Conventional Two-Port Design:
Simulated One-Port Design:
1
D
(3 places)
J
(2 places)
2
3
45°
Millimeters
Inches
Dimensions
Min
A
B
C
D
E
F
G
H
J
Equivalent LC Model
The following equivalent LC model is valid near resonance:
2
1
LM
R
Co
M
C
M
Co
3
22
Max
9.30
3.18
2.50
3.50
0.46 Nominal
5.08 Nominal
2.54 Nominal
2.54 Nominal
1.02
1.40
Min
Max
0.366
0.125
0.098
0.138
0.018 Nominal
0.200 Nominal
0.100 Nominal
0.100 Nominal
0.040
0.055
