RP1239 ® • • • • Designed for 315 MHz Transmitters Nominal Insertion Phase Shift of 180° at Resonance Quartz Stability Rugged, Hermetic, Low-Profile TO39 Case 315.0 MHz SAW Resonator The RP1239 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 low-power AM and FSK transmitters operating at 315.0 MHz for use in the United Kingdom under DTI MPT 1340 and in the USA under FCC Part 15. Applications include remote-control and wireless security devices. This is a pin-for-pin replacement in preexisting transmitter circuits utilizing two-port, 180° SAW resonators. Absolute Maximum Ratings Rating Value Units CW RF Power Dissipation (See: Typical Test Circuit) +0 dBm DC Voltage Between Any Two Pins (Observe ESD Precautions) ±30 VDC -40 to +85 °C Case Temperature TO39-3 Case Electrical Characteristics Center Frequency Characteristic Absolute Frequency Tolerance from 315.000 MHz Insertion Loss Quality Factor Temperature Stability 2, 3, 4, 5, IL 2, 5, 6 QU 50 Ω Loaded Q QL Turnover Temperature TO Turnover Frequency fO Absolute Value during First Year Minimum 314.925 |fA| RM Motional Inductance LM Motional Capacitance CM Shunt Static Capacitance CO Maximum 315.075 Units MHz ±75 kHz 8.5 dB 18,000 5, 6, 7 8,100 37 6, 7, 8 52 67 kHz 0.037 ppm/°C2 ppm/yr 1.0 MΩ 84 5, 7, 9 167 758.027 1.9 Lid Symbolization (in addition to Lot and/or Date Codes) 2.2 Ω µH 0.336771 5, 6, 9 °C fC+8.5 ≤ 10 6 5 Motional Resistance Typical 5.3 FTC DC Insulation Resistance between Any Two Pins RF Equivalent RLC Notes ∆fC Unloaded Q Frequency Temp. Coefficient Frequency Aging Sym fC fF 2.5 pF RFM P1239 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 +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 significantly in subsequent years. The frequency fC 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, 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 = +25°C± 5°C 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 ©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. E-mail: [email protected] http://www.rfm.com RP1239-110499 Page 1 of 2 315.0 MHz SAW Resonator Electrical Connections Equivalent LC Model 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: 2 1 LM R Pin Connection 1 2 3 Input or Output Output or Input Case Ground M C M Co Co Bottom View 3 Pin 1 Pin 2 Pin 3 Temperature Characteristics Power Test P INCIDENT Electrical Test 1 50 Ω Source at P REFLECTED F C From 50Ω Network Analyzer 2 Low-Loss Matching Network to 50 Ω 2 1 fC = f O , T C = T O 0 0 -50 -50 -100 -100 -150 -150 (f-fo ) / fo (ppm) Typical Test Circuit The curve shown on the right accounts for resonator contribution only and does not include LC component temperature contributions. -200 0 +20 +40 +60 +80 -200 -80 -60 -40 -20 To 50Ω Network Analyzer ∆T = T C - T O ( °C ) 3 3 Typical Frequency Response -P CW RF Power Dissipation = P REFLECTED INCIDENT The plot shown below is a typical frequency response for the RP series of two-port resonators. The plot is for RP1094. 200.0 -10.0 Typical Application Circuits 100.0 -20.0 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: 0.0 -200.0 -300.0 -400.0 -40.0 Simulated One-Port Design: S21 phase (deg.) S21 magn.(dB) -100.0 -30.0 -500.0 -600.0 -50.0 -700.0 -60.0 1 Phasing Phasing & Match & Match 2 901.2 -800.0 905.2 909.2 913.2 917.2 921.2 925.2 929.2 Frequency (MHz) 3 Millimeters Case Design Inches Dimensions Min C A G B B C H F E A D (3 places) J (2 places) RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 ©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. Min 3.50 Max 0.370 3.18 2.50 0.125 0.098 0.138 D 0.46 Nominal 0.018 Nominal E 5.08 Nominal 0.200 Nominal F 2.54 Nominal 0.100 Nominal G 2.54 Nominal 0.100 Nominal H 45° Max 9.40 J 1.02 1.40 0.040 0.055 E-mail: [email protected] http://www.rfm.com RP1239-110499 Page 2 of 2