RFM products are now Murata products. RO3073 Ideal for 315.0 MHz Transmitters Low Series Resistance 315.0 MHz Quartz Stability Rugged, Hermetic, Low-Profile TO39 Case Pb SAW Complies with Directive 2002/95/EC (RoHS) Resonator The RO3073 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 315 MHz. The RO3073 is designed specifically for wireless remote controls and security transmitters, typically for automotive-keyless-entry, operating in the USA under FCC Part 15, in Canada under DoC RSS- 210, and in Italy. 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 Case Temperature -40 to +85 C Soldering Temperature (10 seconds/5 cycles Max) 260 C TO39-3 Case Electrical Characteristics Characteristic Sym Notes Minimum Typical Maximum Units Center Frequency (+25 C) Absolute Frequency f 314.925 315.075 MHz C 2, 3, 4, 5 Tolerance from 315.000 MHz f 75 kHz C Insertion Loss IL 2, 5, 6 1.5 2.2 dB Quality Factor Unloaded Q Q 7800 U 5, 6, 7 50 Loaded Q Q 1100 L Temperature Stability Turnover Temperature T 10 25 40 C O Turnover Frequency f 6, 7, 8 f kHz O c 2 Frequency Temperature Coefficient FTC 0.037 ppm/C Frequency Aging Absolute Value during the First Year f 10 ppm/yr 1 A DC Insulation Resistance between Any Two Pins 5 1.0 M RF Equivalent RLC Model Motional Resistance R 16 M Motional Inductance L 63 H 5, 7, 9 M Motional Capacitance C 4.1 fF M Pin 1 to Pin 2 Static Capacitance C 5, 6, 9 3.6 pF O Transducer Static Capacitance C 5, 6, 7, 9 3.6 pF P Test Fixture Shunt Inductance L 2, 7 65.7 nH TEST Lid Symbolization (in Addition to Lot and/or Date Codes) RFM RO3073 CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. NOTES: 1. Frequency aging is the change in f with time and is specified at +65C or subject to change without notice. C 7. Derived mathematically from one or more of the following directly less. Aging may exceed the specification for prolonged temperatures measured parameters: f , IL, 3 dB bandwidth, f versus T , and C . above +65C. Typically, aging is greatest the first year after manufacture, C C C O decreasing significantly in subsequent years. 8. Turnover temperature, T , is the temperature of maximum (or turnover) O 2. The center frequency, f , is measured at the minimum insertion loss point, C frequency, f . The nominal frequency at any case temperature, T , may be O C IL , with the resonator in the 50 test system (VSWR 1.2:1). The 2 MIN calculated from: f = f 1 - FTC (T -T ) . Typically, oscillator T is 20C O O C O shunt inductance, L , is tuned for parallel resonance with C at f . TEST O C less than the specified resonator T . O Typically, f or f is less than the resonator f . OSCILLATOR TRANSMITTER C 9. This equivalent RLC model approximates resonator performance near the 3. One or more of the following United States patents apply: 4,454,488 and resonant frequency and is provided for reference only. The capacitance C O 4,616,197 and others pending. is the static (nonmotional) capacitance between pin1 and pin 2 measured 4. Typically, equipment designs utilizing this device require emissions testing at low frequency (10 MHz) with a capacitance meter. The measurement and government approval, which is the responsibility of the equipment includes case parasitic capacitance with a floating case. For usual manufacturer. grounded case applications (with ground connected to either pin 1 or pin 2 5. Unless noted otherwise, case temperature T = +25C2C. C and to the case), add approximately 0.25 pF to C . O 6. The design, manufacturing process, and specifications of this device are 1 of 2 www.murata.com 2010-2015 by Murata Electronics N.A., Inc RO373 (R) 09/03/2015Electrical Connections Temperature Characteristics This one-port, two-terminal SAW resonator is bidirectional. The terminals The curve shown on the right f = f , T = T C O C O are interchangeable with the exception of circuit board layout. 0 0 accounts for resonator -50 Pin Connection contribution only and does not -50 include oscillator temperature -100 -100 Bottom View 1Terminal 1 characteristics. -150 -150 2Terminal 2 Pin 1 Pin 2 -200 3 Case Ground -200 -80 -60 -40 -20 0 +20 +40 +60 +80 Pin 3 T = T - T ( C ) C O Typical Test Circuit The test circuit inductor, L , is tuned to resonate with the static TEST capacitance, C at F . O C Equivalent LC Model The following equivalent LC model is valid near resonance: Electrical Test: 1 2 2 1 Network Network Analyzer Analyzer C =C +0.25 pF* o p C p 3 *Case Parasitics R L C MM M 0.5 pF* 0.5 pF* Power Test: 3 1 P INCIDENT Low-Loss 50 Case Design Matching Source at P REFLECTED Network F C to 50 3 C G 2 B - CW RF Power Dissipation = P P INCIDENT H REFLECTED F E A Typical Application Circuits D (3 places) Typical Low-Power Transmitter Application: J 200k (2 places) MPS-H10 45 Modulation +9VDC Input 47 C1 L1 1 2 (Antenna) Millimeters Inches Dimensions C2 Min Max Min Max ROXXXX 3 RF Bypass Bottom View A 9.40 0.370 470 B 3.18 0.125 C 2.50 3.50 0.098 0.138 D 0.46 Nominal 0.018 Nominal Typical Local Oscillator Application: E 5.08 Nominal 0.200 Nominal Output +VDC F 2.54 Nominal 0.100 Nominal C1 G 2.54 Nominal 0.100 Nominal L1 +VDC 1 2 H 1.02 0.040 J 1.40 0.055 C2 ROXXXX 3 Bottom View RF Bypass 2 of 2 www.murata.com 2010-2015 by Murata Electronics N.A., Inc RO373 (R) 09/03/2015 f (ppm) (f-f ) o / o