RP1234 • Designed for 303.825 MHz Low-Power Superhet Receivers • 180° Nominal Insertion Phase at Resonance • Rugged, Hermetic, Low Profile TO-39 Case 293.175 MHz SAW Resonator The RP1234 is a 2-port surface acoustic wave resonator (SAWR) that provides reliable quartz frequency stabilization of fixed frequency local oscillators at 293.125 MHz. (The nominal SAWR frequency is typically 50 kHz higher than the nominal radio frequency.) Typical applications include wireless security and remote control receivers operating in the USA (FCC Part 15), Australia, Japan and Korea. ABSOLUTE MAXIMUM RATINGS Rating Value Units +10 dBm ±30 VDC -40 to +85 °C CW RF Power Dissipation DC Voltage between any 2 pins (See note 9) Case Temperature TO39-3 Case ELECTRICAL CHARACTERISTICS Characteristic Center Frequency (+25°C) Absolute Frequency Relative to 293.175 MHz Insertion Loss Quality Factor Temperature Stability Sym Notes fc 1 ∆f c IL 1 Unloaded Q QU 2 50 Ω Loaded Q QL Turnover Temperature To Turnover Frequency Freq. Temp. Coefficient Minimum Typical Maximum Units 293.075 293.275 MHz ±100 kHz 13.1 18.0 dB 12,000 9,400 38 53 68 fo f c + 8.5 kHz FTC 0.037 ppm/°C2 < ±10 ppm/yr 2, 3 °C Frequency Aging 4 DC Insulation Resistance between any 2 pins 1.0 MΩ 2, 5 352 695 Ω RF Equivalent RLC Model Motional Resistance Rm Motional Inductance Lm 2.31659 mH Motional Capacitance Cm 0.127215 fF Shunt Static Capacitance Co 1.0 1.3 1.6 pF Lid Symbolization (in addition to lot and/or date code) 5 RFM P1234 Notes: (Unless noted otherwise, case temperature, Tc = +25°C ±2°C.) 1. f c is the frequency of minimum IL with the resonator in a 50 Ω test system with VSWR ≤ 1.2:1. (Typically, fOSCILLATOR < f c ) 2. Derived mathematically from one or more of the following directly measured parameters: f c , IL, 3 dB bandwidth, f c vs. Tc , and Co . 3. 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 ]. (Note that oscillator To is typically 20°C less than specified resonator To .) 4. 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. 5. This equivalent RLC model approximates resonator performance near the resonant frequency and is provided for reference only. C o is the measured static (nonmotional) capacitance between pin 1 and ground or pin 2 and ground and includes case parasitic capacitance. 6. The design, manufacturing process, and specifications of this device are subject to change without notice. 7. One or more of the following U. S. Patents apply: 4,454,488 and 4,616,197. RFM® is a registered trademark of RF Monolithics, Inc. 8. Equipment utilitizing this device typically requires emissions testing and government approval, which is the responsibility of the equipment manufacturer. 9. CAUTION: ELECTROSTATIC SENSITIVE DEVICE. Observe precautions for handling. RP1234.CHP-A-01-121994AC ÃRPBACK.CHP © 1994 RF Monolithics, Inc.