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RP1237 418.0 MHz SAW Resonator
* * * * *
Designed for 418.00 MHz Transmitters Nominal Insertion Phase Shift of 180 at Resonance Quartz Stability Rugged, Hermetic, Low-Profile TO39 Case Complies with Directive 2002/95/EC (RoHS) Pb
The RP1237 is a two-port, 180 surface-acoustic-wave (SAW) resonator in a low-profile TO39 case. It provides reliable, fundamental-mode, quartz frequency stabilization of fixed-frequency transmitters operating at 418.0 MHz. The RP1237 is designed specifically for remote-control and wireless security transmitters operating in the United Kingdom under DTI MPT 1340 and in the USA under FCC Part 15.231 regulations.
Absolute Maximum Ratings
Rating CW RF Power Dissipation (See: Typical Test Circuit) DC Voltage Between Any Two Pins (Observe ESD Precautions) Case Temperature Value +0 30 -40 to +85 Units dBm VDC C
TO39-3 Case
Electrical Characteristics
Center Frequency Insertion Loss Quality Factor Temperature Stability Unloaded Q 50 Loaded Q Turnover Temperature Turnover Frequency Frequency Temp. Coefficient Frequency Aging RF Equivalent RLC Absolute Value during First Year Motional Resistance Motional Inductance Motional Capacitance Shunt Static Capacitance Lid Symbolization (in addition to Lot and/or Date Codes) DC Insulation Resistance between Any Two Pins RM LM CM CO 5, 6, 9 2.0 5, 7, 9 Characteristic Absolute Frequency Tolerance from 418.000 MHz Sym fC fC IL QU QL TO fO FTC |fA| 6 5 1.0 93 477.932 0.303334 2.3 RFM P1237 2.6 152 6, 7, 8 Notes 2, 3, 4, 5, 2, 5, 6 5, 6, 7 47 Minimum 417.925 Typical Maximum 418.075 75 5.7 13,600 6,500 62 fC+21 0.037 10 77 C kHz ppm/C2 ppm/yr M H fF pF 8.0 Units MHz kHz dB
CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
1. 2. 3. 4. 5. 6. 7. 8. 9. Notes: Frequency aging is the change in fC with time and is specified at +65C or less. Aging may exceed the specification for prolonged temperatures above +65C. Typically, aging is greatest the first year after manufacture, decreasing significantly in subsequent years. The frequency fC is the frequency of minimum IL with the resonator in the specified test fixture in a 50 test system with VSWR 1.2:1. Typically, fOSCILLATOR or fTRANSMITTER is less than the resonator fC. One or more of the following United States patents apply: 4,454,488; 4,616,197. Typically, equipment utilizing this device requires emissions testing and government approval, which is the responsibility of the equipment manufacturer. Unless noted otherwise, case temperature TC = +25C 5C The design, manufacturing process, and specifications of this device are subject to change without notice. Derived mathematically from one or more of the following directly measured parameters: fC, IL, 3 dB bandwidth, fC versus TC, and CO. 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. 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 parasitic capacitance.
RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 (c)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 RP1237-110499
Page 1 of 2
418.0 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, impedances and circuit board parasitics may not be symmetrical, requiring slightly different oscillator component-matching values.
LM
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 contribution only and does not include LC component temperature contributions.
fC = 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 Network Analyzer To 50 Network Analyzer
-150 -200 -80 -60 -40 -20
50 Source at P REFLECTED F C
Low-Loss Matching Network to 50
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 (c)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 RP1237-110499
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. Oneport 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.

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