RO3132A * * * * * Ideal for European 312.0 MHz Transmitters Very Low Series Resistance Quartz Stability Surface-Mount Ceramic Case Complies with Directive 2002/95/EC (RoHS) 312.0 MHz SAW Resonator Pb The RO3132A 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 312.0 MHz. This SAW is designed specifically for remote-control and wireless security transmitters operating in Europe under ETSI I-ETS 300 220 and in Germany under FTZ 17 TR 2100. 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.) Electrical Characteristics Characteristic Center Frequency (+25 C) Sym fC Absolute Frequency Tolerance from 312.0 MHz fC Unloaded Q QU 50 Loaded Q QL Turnover Temperature TO Insertion Loss Quality Factor Temperature Stability Frequency Aging 2,3,4,5 IL Absolute Value during the First Year |fA| 25 MHz 75 kHz 2.2 dB 40 C fC 0.032 10 1 5 Units 312.075 2000 6,7,8 FTC 1.0 ppm/C2 ppm/yr M 17.4 5, 7, 9 120 H 2.2 fF CO 5, 6, 9 .74 pF LTEST 2, 7 351 nH Motional Resistance RM Motional Inductance LM Motional Capacitance CM Shunt Static Capacitance Test Fixture Shunt Inductance 1.4 Maximum 13500 10 Frequency Temperature Coefficient Typical 311.925 5,6,7 DC Insulation Resistance between Any Two Terminals RF Equivalent RLC Model Minimum 2,5,6 fO Turnover Frequency Notes SM5035-4 Lid Symbolization (in addition to Lot and/or Date Codes) 794 // YWWS 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 are subject to change without notice. www.RFM.com E-mail: info@rfm.com (c)2008 by RF Monolithics, Inc. 7. 8. 9. 10. 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 RO3132A - 3/27/08 Electrical Connections Equivalent LC Model 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. Terminal Case Ground Case Ground 0.05 pF* Co = Cp + 0.05 pF Cp Lm Rm Cm Typical Test Circuit Temperature Characteristics 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. To 50 Network Analyzer From 50 Network Analyzer 0 -50 -50 -100 -100 -150 -150 -200 0 +20 +40 +60 +80 -200 -80 -60 -40 -20 Board 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. POWER TEST P INCIDENT CW RF Power Dissipation = Typical Circuit Land Pattern fC = f O , T C = T O 0 (f-fo ) / fo (ppm) ELECTRICAL TEST 50 Source P at F C REFLECTED *Case Parasitics Terminal Low-Loss Matching Network to 50 (4 Places) Terminal NC NC Typical Dimension: 0.010 to 0.047 inch (0.25 to 1.20 mm) Terminal Case Design P INCIDENT - P REFLECTED Top View Typical Application Circuits Side View B Bottom View C E (3x) Typical Low-Power Transmitter Application +9VDC 200k 4 C1 47 L1 (Antenna) F (4x) 3 A Modulation Input 1 2 C2 G (1x) RF Bypass RO3XXXA Bottom View 470 D Typical Local Oscillator Applications Millimeters Output +VDC C1 +VDC L1 C2 RO3XXXA Bottom View www.RFM.com E-mail: info@rfm.com (c)2008 by RF Monolithics, Inc. RF Bypass Inches Dimensions Min Nom Max Min Nom Max A 4.87 5.0 5.13 .191 .196 .201 B 3.37 3.5 3.63 .132 .137 .142 C 1.45 1.53 1.60 .057 .060 .062 D 1.35 1.43 1.50 .040 .057 .059 E .67 .80 .93 .026 .031 .036 F .37 .50 .63 .014 .019 .024 G 1.07 1.20 1.33 .042 .047 .052 Page 2 of 2 RO3132A - 3/27/08