RO3118E * * * * Ideal for 318 MHz Automotive-Keyless-Entry Transmitters Very Low Series Resistance Quartz Stability Pb Complies with Directive 2002/95/EC (RoHS) 318.0 MHz SAW Resonator The RO3118E 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 318 MHz. Absolute Maximum Ratings Rating Value Units Input Power Level 0 dBm DC Voltage 12 VDC Storage Temperature Range -40 to +125 C Operating Temperature Range -40 to +105 C 260 C Soldering Temperature (10 seconds / 5 cycles max.) Electrical Characteristics Characteristic Frequency (+25 C) Sym fC Absolute Frequency Quality Factor Temperature Stability Frequency Aging 2, 3, 4, 5 fC Tolerance from 315.0 MHz Insertion Loss IL Minimum 1.6 Unloaded Q QU 9000 50W Loaded Q QL 1500 Turnover Temperature TO Turnover Frequency fO 10 FTC Absolute Value during the First Year |fA| 25 Maximum Units 318.075 MHz 75 kHz 2.2 dB 40 C fC 6, 7, 8 Frequency Temperature Coefficient 0.032 1, 6 5 10 1.0 ppm/C2 ppm/yr M 21 93 H 2.7 fF Motional Resistance RM Motional Inductance LM Motional Capacitance CM Shunt Static Capacitance CO 5, 6, 9 2.8 pF LTEST 2, 7 82 nH Test Fixture Shunt Inductance 5, 7, 9 Lid Symbolization Standard Reel Quantity Typical 317.925 2, 5, 6 DC Insulation Resistance between Any Two Terminals RF Equivalent RLC Model Notes SM3030-6 Case 3.0 X 3.0 687 // 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. Frequency aging is the change in fC with time and is specified at +65C or less. Aging may exceed the specification for prolonged temperatures above +65C. 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 = +25C2C. 6. 7. 8. 9. 10. www.RFM.com E-mail: info@rfm.com (c)2008 by RF Monolithics, Inc. 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 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. Page 1 of 2 RO3118E - 3/27/08 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 G C H Typical Low-Power Transmitter Application 6 1 1 6 200k +9VDC Modulation Input A 2 E 5 F 2 5 C1 I 47 L1 (Antenna) 3 4 1 3 4 6 D 2 3 5 4 J C2 ROXXXXC Bottom View RF Bypass 470 Typical Local Oscillator Application Case Dimensions +VDC mm Dimension A B C D E F G H I J Output 200k C1 Inches +VDC L1 Min Nom Max Min Nom Max 2.87 2.87 1.12 0.77 2.67 1.47 0.72 1.37 0.47 1.17 3.0 3.0 1.25 0.90 2.80 1.6 0.85 1.5 0.60 1.30 3.13 3.13 1.38 1.03 2.93 1.73 0.98 1.63 0.73 1.43 0.113 0.113 0.044 0.030 0.105 0.058 0.028 0.054 0.019 0.046 0.118 0.118 0.049 0.035 0.110 0.063 0.033 0.059 0.024 0.051 0.123 0.123 0.054 0.040 0.115 0.068 0.038 0.064 0.029 0.056 1 6 2 3 5 4 C2 ROXXXXC Bottom View RF Bypass Equivalent LC Model 0.05 pF* Co = Cp + 0.05 pF Cp Typical Test Circuit The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO, at FC. Rm Electrical Test Lm *Case Parasitics 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 0 6 From 50 Network Analyzer 5 2 4 3 To 50 Network Analyzer 0 -50 -50 -100 -100 -150 -150 (f-fo ) / fo (ppm) 1 -200 -80 -60 -40 -20 -200 0 +20 +40 +60 +80 T = T C - T O ( C ) www.RFM.com E-mail: info@rfm.com (c)2008 by RF Monolithics, Inc. Page 2 of 2 RO3118E - 3/27/08