RFM products are now Murata products. RO3118 • • • • • Designed for 318 MHz Transmitter Applications Low Series Resistance Quartz Stability Rugged, Hermetic, Low-Profile TO39 Case Complies with Directive 2002/95/EC (RoHS) 318.00 MHz SAW Resonator Pb The RO3118 is a true one-port, 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 or near 318 MHz. Absolute Maximum Ratings Rating Value Units CW RF Power Dissipation +0 dBm DC Voltage Between Terminals (Observe ESD Precautions) ±30 VDC Case Temperature -40 to +85 °C 260 °C Soldering Temperature (10 seconds / 5 cycles max. Electrical Characteristics Characteristic Frequency (+25 °C) Sym fC Nominal Frequency Insertion Loss Quality Factor Temperature Stability Frequency Aging 2, 3, 4, 5 fC Tolerance from 318.000 MHz IL Unloaded Q QU 50 Loaded Q QL Turnover Temperature TO Turnover Frequency fO 1.5 |fA| 1, 6 5 Motional Resistance RM Motional Inductance LM Motional Capacitance CM Pin 1 to Pin 2 Static Capacitance CO Transducer Static Capacitance CP LTEST 2, 7 Units 318.075 MHz ±75 kHz 2.0 dB 1400 6, 7, 8 FTC Maximum 10700 10 Frequency Temperature Coefficient Typical 317.925 5, 6, 7 Absolute Value during the First Year Test Fixture Shunt Inductance Minimum 2, 5, 6 DC Insulation Resistance between Any Two Pins RF Equivalent RLC Model Notes TO39-3 Case 25 40 °C fC+4.2 kHz 0.037 ppm/°C2 ppm/yr 10 1.0 M 15 80 µH 3.1 fF 5, 6, 9 2.6 5, 6, 7, 9 3.0 pF pF 96 nH 5, 6, 7, 9 Lid Symbolization (in addition to Lot and/or Date Codes) RFM // RO3118 CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. NOTES: 1. 2. 3. 4. 5. 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 center frequency, fC, is measured at the minimum insertion loss point, ILMIN, with the resonator in the 50 test system (VSWR 1.2:1). The shunt inductance, LTEST, is tuned for parallel resonance with CO at fC. Typically, fOSCILLATOR or fTRANSMITTER is less than the resonator fC. One or more of the following United States patents apply: 4,454,488 and 4,616,197 and others pending. Typically, equipment designs utilizing this device require emissions testing and government approval, which is the responsibility of the equipment manufacturer. Unless noted otherwise, case temperature TC = +25°C±2°C. ©2010-2014 by Murata Electronics N.A., Inc. RO3118 (R) 4/18/14 6. 7. 8. 9. Page 1 of 2 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°C 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 static (nonmotional) capacitance between pin1 and pin 2 measured at low frequency (10 MHz) with a capacitance meter. The measurement includes case parasitic capacitance with a floating case. For usual grounded case applications (with ground connected to either pin 1 or pin 2 and to the case), add approximately 0.25 pF to CO. www.murata.com Electrical Connections Temperature Characteristics Pin Connection 1 Terminal 1 2 Terminal 2 3 Bottom View Pin 1 Pin 2 The curve shown on the right accounts for resonator contribution only and does not include oscillator temperature characteristics. fC = f O , T C = T O -50 -50 -100 -100 -150 -150 -200 -80 -60 -40 -20 Pin 3 Case Ground 0 0 (f-fo ) / fo (ppm) This one-port, two-terminal SAW resonator is bidirectional. The terminals are interchangeable with the exception of circuit board layout. -200 0 +20 +40 +60 +80 T = TC - T O ( °C ) Typical Test Circuit The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO at FC. Equivalent LC Model Electrical Test: The following equivalent LC model is valid near resonance: 2 1 Network Analyzer 1 Network Analyzer 2 3 Co= Cp + 0.25 pF* Cp R Power Test: M L M C *Case Parasitics M 0.5 pF* 0.5 pF* 1 P INCIDENT Low-Loss Matching Network to 50 50 Source at P REFLECTED F C 3 Case Design 3 2 C -P P INCIDENT REFLECTED CW RF Power Dissipation = G B Typical Application Circuits H F A Typical Low-Power Transmitter Application: Modulation Input 200k D (3 places) MPS-H10 +9VDC 1 J (2 places) 47 C1 L1 C2 3 RF Bypass Dimensions 470 Typical Local Oscillator Application: ROXXXX Bottom View L1 +VDC 2 C2 3 RF Bypass Min 9.30 3.18 2.50 3.50 Inches Min Max 0.366 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 Page 2 of 2 Max B J ©2010-2014 by Murata Electronics N.A., Inc. RO3118 (R) 4/18/14 Millimeters A C Output +VDC C1 45° (Antenna) 2 ROXXXX Bottom View 1 E 1.02 1.40 0.040 0.055 www.murata.com