RO3073A-1 * * * * * Ideal for 315.0 MHz Transmitters Very Low Series Resistance Quartz Stability Surface-mount Ceramic Case Complies with Directive 2002/95/EC (RoHS) 315.0 MHz SAW Resonator Pb The RO3073A-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 fixed-frequency transmitters operating at 315.0 MHz. This SAW is designed specifically for remote control and wireless security transmitters. Absolute Maximum Ratings Rating Value Units +0 dBm CW RF Power Dissipation (See: Typical Test Circuit) DC Voltage Between Terminals (Observe ESD Precautions) Case Temperature 30 VDC -40 to +85 C 260 C Soldering Temperature (10 seconds / 5 cycles maximum) SM5035-4 Electrical Characteristics Characteristic Center Frequency, +25 C Sym fC Absolute Frequency fC Tolerance from 315.0 MHz Insertion Loss Quality Factor Temperature Stability Frequency Aging IL Unloaded Q QU 50 Loaded Q QL Turnover Temperature TO Turnover Frequency fO 1.5 |fA| RM Motional Inductance LM Motional Capacitance CM Shunt Static Capacitance CO LTEST MHz 50 kHz 2.2 dB 40 C fC 10 1 Motional Resistance 25 0.032 5 Units 315.050 8000 10 Absolute Value during the First Year Maximum 1300 6,7,8 FTC Typical 314.950 5,6,7 Frequency Temperature Coefficient Test Fixture Shunt Inductance 2,3,4,5 Minimum 2,5,6 DC Insulation Resistance between Any Two Terminals RF Equivalent RLC Model Notes 1.0 5, 7, 9 ppm/C2 ppm/yr M 19.4 78.4 H 3.3 fF 5, 6, 9 4.1 pF 2, 7 64.2 nH Lid Symbolization (in addition to Lot and/or Date Codes) 742 // 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 +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 2 C. The design, manufacturing process, and specifications of this device are www.RFM.com E-mail: info@rfm.com (c) 2008-2011 by RF Monolithics, Inc. 7. 8. 9. 10. 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 RO3073A-1 6/29/11 Electrical Connections Equivalent 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. 0.05 pF* Case Ground Case Ground Terminal Co = Cp + 0.05 pF Cp Terminal Lm Rm *Case Parasitics Cm Temperature Characteristics The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO, at FC. fC = f O , T C = T O -50 -50 -100 -100 -150 -150 -200 0 +20 +40 +60 +80 -200 -80 -60 -40 -20 ELECTRICAL TEST Case T = T C - T O ( C ) To 50 Network Analyzer From 50 Network Analyzer 0 0 (f-fo ) / fo (ppm) Typical Test Circuit The curve shown on the right accounts for resonator contribution only and does not include LC component temperature contributions. T o p V ie w S id e V ie w B C B o tto m V ie w E (3 x ) 4 F (4 x ) 1 A POWER TEST 3 P INCIDENT 50 Source P at F C REFLECTED CW RF Power Dissipation = Low-Loss Matching Network to 50 2 Terminal G (1 x ) NC NC D Terminal H P INCIDENT - P REFLECTED I Typical Application Circuits J Typical Low-Power Transmitter Application K +9VDC L 200k Modulation Input C1 47 H L1 (Antenna) M J M H PCB Land Pattern Top View C2 RF Bypass RO3XXXA Bottom View Dimensions 470 Typical Local Oscillator Applications Output +VDC C1 +VDC L1 C2 RO3XXXA Bottom View www.RFM.com E-mail: info@rfm.com (c) 2008-2011 by RF Monolithics, Inc. RF Bypass Millimeters Inches Min Nom Max Min Nom Max A 4.87 5.00 5.13 0.191 0.196 0.201 B 3.37 3.50 3.63 0.132 0.137 0.142 C 1.45 1.53 1.60 0.057 0.060 0.062 D 1.35 1.43 1.50 0.040 0.057 0.059 E 0.67 0.80 0.93 0.026 0.031 0.036 F 0.37 0.50 0.63 0.014 0.019 0.024 G 1.07 1.20 1.33 0.042 0.047 0.052 H - 1.04 - - 0.041 - I - 1.46 - - 0.058 - J - 0.50 - - 0.019 - K - 1.05 - - 0.041 - L - 1.44 - - 0.057 - M - 0.71 - - 0.028 - Page 2 of 2 RO3073A-1 6/29/11