RP1261
913.612 MHz
•
•
•
•
SAW Resonator
Ideal for 913.5 MHz FCC Part 15.249 Transmitters
Nominal Insertion Phase Shift of 180° at Resonance
Quartz Stability
Rugged, Hermetic, Low-Profile TO39 Case
The RP1261 is a two-port, 180
°
surface-acoustic-wave (SAW) resonator in a low-pro-
file TO39 case. It provides reliable, fundamental-mode, quartz frequency stabilization
of fixed-frequency oscillators and transmitters operating at 913.5 MHz. This resonator
was designed specifically for use in low-power transmitters operating in the USA
under FCC Part 15.249 regulations and in Canada under DoC RSS-210.
TO39-3 Case
Electrical Characteristics
Characteristic
Center Frequency (+25°C)
Insertion Loss
Quality Factor
Temperature Stability
Unloaded Q
50
Ω
Loaded Q
Turnover Temperature
Turnover Frequency
Frequency Temp. Coefficient
Frequency Aging
RF Equivalent RLC Model
Absolute Value during First Year
Sym
f
C
∆f
C
IL
Q
U
Q
L
T
O
f
O
FTC
|f
A
|
R
M
L
M
C
M
C
O
Notes
2, 3, 4, 5,
Minimum
913.400
Typical
Maximum
913.824
±212
Units
MHz
kHz
dB
Absolute Frequency
Tolerance from 913.612 MHz
2, 5, 6
5, 6, 7
23
6, 7, 8
6
5
5, 7, 9
5, 6, 9
1.4
1.0
8.2
6,500
4,000
38
f
C
+5.7
0.037
≤
10
157
177.124
0.171332
10.0
53
°C
kHz
ppm/°C
2
ppm/yr
MΩ
217
Ω
µH
fF
2.0
pF
DC Insulation Resistance between Any Two Pins
Motional Resistance
Motional Inductance
Motional Capacitance
Shunt Static Capacitance
Lid Symbolization (in addition to Lot and/or Date Codes)
1.7
RFM P1261
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. Frequency aging is the change in f
C
with time and is specified at +65°C or less. Aging may exceed the specification for prolonged temperatures
above +65°C. Typically, aging is greatest the first year after manufacture, decreasing in subsequent years.
2. The frequency f
C
is the frequency of minimum IL with the resonator in the specified test fixture in a 50
Ω
test system with VSWR
≤
1.2:1. Typically,
f
OSCILLATOR
or f
TRANSMITTER
is less than the resonator f
C
.
3. One or more of the following United States patents apply: 4,454,488; 4,616,197.
4. Typically, equipment utilizing this device requires emissions testing and government approval, which is the responsibility of the equipment manufac-
turer.
5. Unless noted otherwise, case temperature T
C
= +25°C± 2°C
6. The design, manufacturing process, and specifications of this device are subject to change without notice.
7. Derived mathematically from one or more of the following directly measured parameters: f
C
, IL, 3 dB bandwidth, f
C
versus T
C
, and C
O
.
8. Turnover temperature, T
O
, is the temperature of maximum (or turnover) frequency, f
O
. The nominal frequency at any case temperature, T
C
, may be
calculated from: f = f
O
[1 - FTC (T
O
- T
C
)
2
]. Typically,
oscillator
T
O
is 20° less than the specified
resonator
T
O
.
9. This equivalent RLC model approximates resonator performance near the resonant frequency and is provided for reference only. The capacitance
C
O
is the measured static (nonmotional) capacitance between either pin 1 and ground or pin 2 and ground. The measurement includes case para-
sitic capacitance.
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-9148
©1998 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: info@rfm.com
http://www.rfm.com
RP1261-120298
Page 1 of 2
913.612 MHz SAW Resonator
Absolute Maximum Ratings
Rating
CW RF Power Dissipation (See: Typical Test Circuit)
DC Voltage Between Any Two Pins (Observe ESD Precautions)
Case Temperature
Value
+5
±30
-40 to +85
Units
dBm
VDC
°C
Electrical Connections
This two-port, three-terminal SAW resonator is bidirectional. However,
impedances and circuit board parasitics may not be symmetrical, requiring
slightly different oscillator component-matching values.
Equivalent LC Model
The following equivalent LC model is valid near resonance:
1
2
L
M
R
Bottom View
M
C
M
Co
3
Pin
1
2
3
Connection
Input or Output
Output or Input
Case Ground
Pin 1
Pin 2
Co
Pin 3
Temperature Characteristics
f
C
= f
O
, T
C
= T
O
Typical Test Circuit
Power Test
P
INCIDENT
1
2
Electrical Test
From 50
Ω
Network
Analyzer
To 50
Ω
Network
Analyzer
The curve shown on the right
accounts for resonator con-
tribution only and does not
include LC component tem-
perature contributions.
0
(f-fo ) / fo (ppm)
0
-50
-100
-150
-200
0 +20 +40 +60 +80
-50
-100
-150
-200
-80 -60 -40 -20
∆T
= T
C
- T
O
( °C )
50
Ω
Source at
P
REFLECTED
F
C
Low-Loss
Matching
Network
to 50
Ω
1
2
3
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
S21 phase (deg.)
S21 magn.(dB)
3
- P
CW RF Power Dissipation = P
REFLECTED
INCIDENT
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:
Simulated One-Port Design:
1
Phasing
& Match
Phasing
& Match
-60.0
2
-800.0
905.2
909.2
913.2
917.2
921.2
925.2
929.2
Frequency (MHz)
901.2
3
Millimeters
Dimensions
Inches
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
Case Design
A
C
B
H
F
A
D
(3 places)
J
(2 places)
E
G
Min
B
C
D
E
F
G
H
45°
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
J
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-9148
©1998 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: info@rfm.com
http://www.rfm.com
RP1261-120298
Page 2 of 2
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