RP1237 RFM [RF Monolithics, Inc], RP1237 Datasheet - Page 2

• Manufacturer Part Number: RP1237
• Description: 418.0 MHz SAW Resonator
• Manufacturer: RFM [RF Monolithics, Inc]

CW RF Power Dissipation =
418.0 MHz
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
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.
Conventional Two-Port Design:
Case Design
RF Monolithics, Inc.
RFM Europe
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
50
Source at
F
C
Phasing
& Match
Pin
1
2
3
P
A
P
REFLECTED
INCIDENT
Power Test
Input or Output
Output or Input
Case Ground
Connection
B
Low-Loss
Matching
Network
to
P
INCIDENT
Phone: [phone]
Phone: [phone]
50
C
Phasing
& Match
(3 places)
-
P
REFLECTED
1
D
E
3
2
F
(2 places)
Simulated One-Port Design:
Pin 1
From 50
Network
Analyzer
J
1
G
SAW Resonator
3
2
Bottom View
45°
Electrical Test
1
H
Fax: [phone]
Fax: [phone]
2
3
Pin 2
Pin 3
To 50
Network
Analyzer
Equivalent LC Model
Temperature Characteristics
The curve shown on the right
accounts for resonator con-
tribution only and does not
include LC component tem-
perature contributions.
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.
The following equivalent LC model is valid near resonance:
Dimensions
A
B
C
D
E
G
H
F
J
-10.0
-20.0
-30.0
-40.0
-50.0
-60.0
901.2
905.2
2.50
1.40
Min
909.2
0.46 Nominal
5.08 Nominal
2.54 Nominal
2.54 Nominal
Millimeters
1
C o
E-mail: [e-mail]
http://www.rfm.com
RP1237-110499
R
M
913.2
Frequency (MHz)
L
M
C
M
-100
-150
-200
Max
9.40
3.18
3.50
1.02
917.2
-50
0
-80 -60 -40 -20
921.2
2
3
C o
T = T
925.2
0.098
0.055
Min
C
0.018 Nominal
0.200 Nominal
0.100 Nominal
0.100 Nominal
- T
0 +20 +40 +60
929.2
O
Inches
f
( °C )
C
200.0
100.0
0.0
-100.0
-200.0
-300.0
-400.0
-500.0
-600.0
-700.0
-800.0
= f
O
Page 2 of 2
, T
0.370
0.125
0.138
0.040
Max
C
+80
= T
0
-50
-100
-150
-200
O