RFM products are now Murata products. RO3073E-1 • • • • Ideal for 315 MHz Automotive-Keyless-Entry Transmitters Very Low Series Resistance Pb Quartz Stability Complies with Directive 2002/95/EC (RoHS) 315.0 MHz SAW Resonator The RO3073E-1 is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount, ceramic case. It provides reliable, fundamental-mode, quartz frequency stabilization of local oscillators operating at approximately 315 MHz. This SAW was designed for AM transmitters in automotive-keyless-entry applications operating in the USA under FCC Part 15, in Canada under DoC RSS-210, and in Italy. Absolute Maximum Ratings Rating Value Units Input Power Level 0 dBm DC Voltage 12 VDC Storage Temperature Range -40 to +125 °C SM3030-6 Case Operating Temperature Range -40 to +105 °C 3.0 X 3.0 260 °C Soldering Temperature (10 seconds / 5 cycles max.) Characteristic Frequency (+25 °C) Sym fC Absolute Frequency Insertion Loss Temperature Stability Frequency Aging 2, 3, 4, 5 fC Tolerance from 315.0 MHz Quality Factor Notes IL Unloaded Q QU 50 Loaded Q QL Turnover Temperature TO Turnover Frequency fO 2, 5, 6 Units MHz ±50 kHz 2.4 dB Absolute Value during the First Year |fA| 35 °C 5 10 1.0 RM LM Motional Capacitance CM Shunt Static Capacitance CO LTEST ppm/°C2 ppm/yr 0.032 1, 6 Motional Inductance 25 fC 6, 7, 8 5, 7, 9 M 19.8 82 µH 3.1 fF 5, 6, 9 4.1 pF 2, 7 63 nH Lid Symbolization Standard Reel Quantity Maximum 315.050 1350 FTC Test Fixture Shunt Inductance 1.6 10 Frequency Temperature Coefficient Motional Resistance Typical 8200 DC Insulation Resistance between Any Two Terminals RF Equivalent RLC Model Minimum 314.950 802 // YWWS Reel Size 7 Inch 10 Reel Size 13 Inch 500 Pieces / Reel 3000 Pieces / Reel CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. NOTES: 1. 2. 3. 4. 5. 6. 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. 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 approximately equal to the resonator fC. One or more of the following United States patents apply: 4,454,488 and 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±2°C. The design, manufacturing process, and specifications of this device are subject to change without notice. ©2010-2014 by Murata Electronics N.A., Inc. RO3073E-1 (R) 3/27/14 7. 8. 9. 10. Page 1 of 3 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 approximately equal to 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 the two terminals measured at low frequency (10 MHz) with a capacitance meter. The measurement includes parasitic capacitance with "NC” pads unconnected. Case parasitic capacitance is approximately 0.05 pF. Transducer parallel capacitance can by calculated as: CP CO - 0.05 pF. Tape and Reel Standard Per ANSI / EIA 481. www.murata.com RFM products are now Murata products. ©2010-2014 by Murata Electronics N.A., Inc. RO3073E-1 (R) 3/27/14 Page 2 of 3 www.murata.com Electrical Connections Pin The SAW resonator is bidirectional and may be installed with either orientation. The two terminals are interchangeable and unnumbered. The callout NC indicates no internal connection. The NC pads assist with mechanical positioning and stability. External grounding of the NC pads is recommended to help reduce parasitic capacitance in the circuit. Power Test Connection 1 NC 2 Terminal 3 NC 4 NC 5 Terminal 6 NC 50 Source at F C P INCIDENT Low-Loss Matching Network to 50 P REFLECTED 1 6 2 3 5 4 Typical Application Circuits B C 1 G 6 H Typical Low-Power Transmitter Application 1 6 Modulation Input A 2 5 E F 2 5 200k +9VDC C1 I 47 L1 (Antenna) 4 3 1 3 4 6 D 2 3 5 4 J C2 ROXXXXC Bottom View RF Bypass 470 Typical Local Oscillator Application Case Dimensions Dimension A B C D E F G H I J Min 2.87 2.87 1.12 0.77 2.67 1.47 0.72 1.37 0.47 1.17 Output 200k mm Nom 3.0 3.0 1.25 0.90 2.80 1.6 0.85 1.5 0.60 1.30 Max 3.13 3.13 1.38 1.03 2.93 1.73 0.98 1.63 0.73 1.43 Min 0.113 0.113 0.044 0.030 0.105 0.058 0.028 0.054 0.019 0.046 Inches Nom 0.118 0.118 0.049 0.035 0.110 0.063 0.033 0.059 0.024 0.051 +VDC Max 0.123 0.123 0.054 0.040 0.115 0.068 0.038 0.064 0.029 0.056 C1 +VDC L1 1 6 2 3 5 4 C2 ROXXXXC Bottom View RF Bypass Equivalent LC Model 0.05 pF* Typical Test Circuit Co = Cp + 0.05 pF Cp *Case Parasitics The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO, at FC. Rm Electrical Test Lm Cm Temperature Characteristics The curve shown on the right accounts for resonator contribution only and does not include LC component temperature contributions. fC = f O , T C = T O 5 2 4 3 To 50 Network Analyzer -50 -50 -100 -100 -150 -150 (f-fo ) / fo (ppm) 1 From 50 Network Analyzer 0 0 6 -200 -80 -60 -40 -20 -200 0 +20 +40 +60 +80 T = T C - T O ( °C ) ©2010-2014 by Murata Electronics N.A., Inc. RO3073E-1 (R) 3/27/14 Page 3 of 3 www.murata.com