RP1236 [ETC]
Analog IC ; 模拟IC\n
ETC 
RP1236
312.0 MHz
SAW Resonator
•
•
•
•
Designed for 312 MHz Low-Power Superhet Transmitters
Nominal Insertion Phase Shift of 180° at Resonance
Quartz Stability
Rugged, Hermetic, Low-Profile TO39 Case
The RP1236 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 transmitters operating at 312 MHz. Typical applications include
wireless security and remote-control receivers operating in the USA under FCC Part 15
and in Canada under DoC RSS-210.
TO39-3 Case
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical Maximum
312.250
Units
f
Center Frequency (+25°C)
Absolute Frequency
311.750
MHz
kHz
dB
C
2, 3, 4, 5,
2, 5, 6
Df
Tolerance from 312.000 MHz
±250
C
Insertion Loss
Quality Factor
IL
8.1
14,000
8,500
39
13.0
Q
Unloaded Q
U
5, 6, 7
Q
50 W Loaded Q
L
T
Temperature Stability
Turnover Temperature
Turnover Frequency
Frequency Temp. Coefficient
Absolute Value during First Year
24
54
°C
O
f
6, 7, 8
f +2.3
kHz
O
C
ppm/°C2
ppm/yr
MW
FTC
0.037
|f |
Frequency Aging
6
5
£ 10
A
DC Insulation Resistance between Any Two Pins
1.0
R
RF Equivalent RLC Model
Motional Resistance
Motional Inductance
Motional Capacitance
Shunt Static Capacitance
154
1.09824
0.236938
1.6
347
1.9
W
M
L
5, 7, 9
5, 6, 9
µH
fF
M
C
M
C
1.3
pF
O
Lid Symbolization (in addition to Lot and/or Date Codes)
RFM P1236
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
Notes:
1. Frequency aging is the change in fC 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 fC is the frequency of minimum IL with the resonator in the specified test fixture in a 50 W test system with VSWR £ 1.2:1. Typically,
fOSCILLATOR or fTRANSMITTER is less than the resonator fC.
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 TC = +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: fC, IL, 3 dB bandwidth, fC versus TC, and CO.
8. Turnover temperature, TO, is the temperature of maximum (or turnover) frequency, fO. The nominal frequency at any case temperature, TC, may be
calculated from: f = fO [1 - FTC (TO - TC)2]. Typically, oscillator TO is 20° less than the specified resonator TO.
9. This equivalent RLC model approximates resonator performance near the resonant frequency and is provided for reference only. The capacitance
CO 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
E-mail: info@rfm.com
http://www.rfm.com
RP1236-120298
Page 1 of 2
©1998 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
312.0 MHz SAW Resonator
Absolute Maximum Ratings
Rating
Value
Units
CW RF Power Dissipation (See: Typical Test Circuit)
DC Voltage Between Any Two Pins (Observe ESD Precautions)
Case Temperature
+0
±30
dBm
VDC
°C
-40 to +85
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:
2
1
L
M
C
R
o
M
M
Bottom View
C
o
C
Pin
Connection
Pin 1
3
Pin 2
Pin 3
1
2
3
Input or Output
Output or Input
Case Ground
Temperature Characteristics
fC = fO , T C = TO
0
0
The curve shown on the right
-50
-50
accounts for resonator con-
-100
-100
tribution only and does not
Typical Test Circuit
-150
-150
-200
include LC component tem-
-200
-80 -60 -40 -20
perature contributions.
Power Test
Electrical Test
0
+40 +60 +80
+20
T = TC - TO ( °C )
D
2
P
1
W
To 50
Network
Analyzer
From 50
Network
Analyzer
W
INCIDENT
Low-Loss
Matching
Network
50
W
1
2
3
Typical Frequency Response
Source at
P
REFLECTED
F
C
to50
W
The plot shown below is a typical frequency response for
the RP series of two-port resonators. The plot is for RP1094.
3
-
CW RF Power Dissipation =
P
P
REFLECTED
INCIDENT
-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
together. However, for most low-cost consumer products, this is only
recommended for retrofit applications and not for new designs.
-100.0
-200.0
-300.0
-400.0
-500.0
-600.0
-700.0
-800.0
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
Phasing
& Match
Phasing
& Match
Frequency (MHz)
3
Millimeters
Inches
Dimensions
Min
Max
Min
Max
Case Design
A
B
C
D
E
F
9.30
3.18
3.50
0.366
0.125
0.138
C
G
B
2.50
0.098
0.46 Nominal
5.08 Nominal
2.54 Nominal
2.54 Nominal
0.018 Nominal
0.200 Nominal
0.100 Nominal
0.100 Nominal
H
F
E
A
D
G
H
J
(3 places)
1.02
0.040
J
1.40
0.055
(2 places)
45°
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-9148
E-mail: info@rfm.com
http://www.rfm.com
RP1236-120298
Page 2 of 2
©1998 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
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