RO2103A * * * * * Ideal for 418 MHz Transmitters in the U.K. and U.S. Very Low Series Resistance Quartz Stability Surface-Mount, Ceramic Case with 21 mm2 Footprint Complies with Directive 2002/95/EC (RoHS) 418.0 MHz SAW Resonator The RO2103A 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 fixed-frequency transmitters operating at 418.0 MHz. This SAW is designed for remote-control and wireless security transmitters operating in the United Kingdom under DTI MPT 1340 and in the USA under FCC Part 15. Absolute Maximum Ratings Rating Value Units CW RF Power Dissipation (See Typical Test Circuit) +0 dBm DC Voltage Between Terminals (Observe ESD Precautions) 30 VDC -40 to +85 C 260 C Case Temperature Soldering Temperature (10 seconds / 5 cycles max.) SM-2 Case Electrical Characteristics Characteristic Frequency (+25 C) Sym fC Nominal Frequency fC Tolerance from 418.000 MHz Insertion Loss Quality Factor Temperature Stability Frequency Aging IL 2, 3, 4, 5 Unloaded Q QU 50 Loaded Q QL Turnover Temperature TO Turnover Frequency fO Typical 417.925 1.0 5, 6, 7 FTC |fA| Units 418.075 MHz 75 kHz 2.0 dB 40 C 1,700 10 Absolute Value during the First Year Maximum 16,100 25 fC 6, 7, 8 Frequency Temperature Coefficient ppm/C2 ppm/yr 0.032 1, 6 5 Motional Resistance RM Motional Inductance LM Motional Capacitance CM Transducer Static Capacitance CO 5, 6, 9 LTEST 2, 7 Test Fixture Shunt Inductance Minimum 2, 5, 6 DC Insulation Resistance between Any Two Terminals RF Equivalent RLC Model Notes 10 1.0 M 12 5, 6, 7, 9 26 74.8223 1.93705 1.6 Lid Symbolization 1.9 80 H fF 2.2 pF nH 106 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 +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. The design, manufacturing process, and specifications of this device www.RFM.com E-mail: info@rfm.com (c)2008 by RF Monolithics, Inc. 7. 8. 9. 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. Page 1 of 2 RO2103A - 3/24/08 Electrical Connections Equivalent LC Model Terminal 0.05 pF* Co = Cp + 0.05 pF NC NC Cp Rm Lm Cm Temperature Characteristics Typical Test Circuit The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO, at FC. The curve shown on the right accounts for resonator contribution only and does not include LC component temperature contributions. Typical Circuit Land Pattern ELECTRICAL TEST To 50 From 50 Network Analyzer *Case Parasitics Terminal Network Analyzer Board fC = f O , T C = T O 0 0 -50 -50 -100 -100 -150 -150 (f-fo ) / fo (ppm) 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. -200 0 +20 +40 +60 +80 -200 -80 -60 -40 -20 T = T C - T O ( C ) The circuit board land pattern shown below is one possible design. The optimum land pattern is dependent on the circuit board assembly process which varies by manufacturer. The distance between adjacent land edges should be at a maximum to minimize parasitic capacitance. Trace lengths from terminal lands to other components should be short and wide to minimize parasitic series inductances. (4 Places) Typical Dimension: 0.010 to 0.047 inch (0.25 to 1.20 mm) Case Design The case material is black alumina with contrasting symbolization. All pads are nominally centered with respect to the base and consist of 40 to 70 microinches electroless gold on 60-350 micorinches electroless nickel. Typical Application Circuits Typical Low-Power Transmitter Application +9VDC Modulation Input 200k 47 C1 L1 (Antenna) C2 ROXXXXA Bottom View RF Bypass Millimeters Min Max Min Max A 5.74 5.99 0.226 0.236 B 3.73 3.99 0.147 0.157 C 1.70 2.29 0.067 0.090 D 0.94 1.10 0.037 0.043 E 0.83 1.20 0.033 0.047 F 1.16 1.53 0.046 0.060 G 0.94 1.10 0.037 0.043 H 0.43 0.59 0.017 0.023 470 Typical Local Oscillator Application Output +VDC C1 ROXXXXA Bottom View www.RFM.com E-mail: info@rfm.com (c)2008 by RF Monolithics, Inc. +VDC L1 C2 RF Bypass Inches Dimensions K 0.43 0.59 0.017 0.023 M 5.08 5.33 0.200 0.210 N 0.38 0.64 0.015 0.025 P 3.05 3.30 0.120 0.130 Page 2 of 2 RO2103A - 3/24/08