|Category||Timing Circuits => Resonators => SAW Resonators|
|Description||Frequency = 418.0 ;; Description = Resonator|
|Datasheet||Download RP1237 datasheet
Designed for 418.00 MHz Transmitters Nominal Insertion Phase Shift 180° at Resonance Quartz Stability Rugged, Hermetic, Low-Profile TO39 Case
The 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.
Characteristic Center Frequency (+25°C) Insertion Loss Quality Factor Temperature Stability Unloaded Q 50 Loaded Q Turnover Temperature Turnover Frequency Temp. Coefficient Frequency Aging RF Equivalent RLC Model
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)CAUTION: Electrostatic Sensitive Device. Observe precautions for handling.
1. Frequency aging is the change in fC with time and is specified +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 C is the frequency of minimum IL with the resonator in the specified test fixture a 50 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: 4,616,197. 4. Typically, equipment utilizing this device requires emissions testing and government approval, which is the responsibility of the equipment manufacturer. 5. Unless noted otherwise, case temperature 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: [1 - FTC (TO - TC)2]. Typically, oscillator 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 parasitic capacitance.by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
CW RF Power Dissipation (See: Typical Test Circuit) DC Voltage Between Any Two Pins (Observe ESD Precautions) Case Temperature
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.The following equivalent LC model is valid near resonance:
Connection Input or Output or Input Case Ground
The curve shown on the right accounts for resonator contribution only and does not include LC component temperature contributions.
The plot shown below is a typical frequency response for the RP series of two-port resonators. The plot is for RP1094.
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. Conventional Two-Port Design: Simulated One-Port Design:by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
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