RO3156A-3 * * * * * Ideal for European 868.95 MHz Transmitters Very Low Series Resistance Quartz Stability Surface-Mount Ceramic Case with 21 mm2 Footprint Complies with Directive 2002/95/EC (RoHS) The RO3156A-3 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 868.95 MHz. This SAW is designed specifically for remote-control and wireless security transmitters operating under ETSI-ETS 300 220 in Europe and under FTZ 17 TR 2100 in Germany. 868.95 MHz SAW Resonator Absolute Maximum Ratings Rating Value Units +5 dBm CW RF Power Dissipation DC Voltage Between Terminals Case Temperature 30 VDC -40 to +85 C 260 C Soldering Temperature (10 seconds / 5 cycles max.) SM5035-4 Electrical Characteristics Characteristic Frequency (+25 C) Nominal Frequency Tolerance from 868.95 MHz Insertion Loss Quality Factor Unloaded Q 50 Loaded Q Temperature Stability Turnover Temperature Turnover Frequency Frequency Temperature Coefficient Frequency Aging Absolute Value during the First Year DC Insulation Resistance between Any Two Terminals RF Equivalent RLC Model Motional Resistance Motional Inductance Motional Capacitance Shunt Static Capacitance Test Fixture Shunt Inductance Lid Symbolization (in addition to Lot and/or Date Codes) Sym fC fC IL QU QL TO fO FTC |fA| RM LM CM CO LTEST Notes 2,3,4,5 Minimum 868.875 2,5,6 5,6,7 10 6,7,8 1 5 Typical 1.2 7500 700 25 fC 0.032 <10 1.0 5, 6, 7, 9 5, 6, 9 2, 7 10.2 14.0 2.0 2.1 14.3 808 // YWWS Maximum 869.025 75 2.0 Units MHz kHz dB 40 C kHz ppm/C2 ppm/yr M H fF pF nH 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 www.RFM.com E-mail: info@rfm.com (c)2008 by RF Monolithics, Inc. 7. 8. 9. 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 RO3156A-3 - 9/24/08 868.95 MHz SAW Resonator Equivalent LC Model Electrical Connections 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 *Case Parasitics Terminal Lm Rm Cm Temperature Characteristics The curve shown on the right Typical Test Circuit fC = f O , T C = T O bution only and does not include LC component temperature contributions. ELECTRICAL TEST To 50 Network Analyzer From 50 Network Analyzer -100 -150 -150 -200 0 +20 +40 +60 +80 Typical Circuit Board Land Pattern 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) P INCIDENT CW RF Power Dissipation = -50 -100 -200 -80 -60 -40 -20 POWER TEST 50 Source P at F C REFLECTED -50 (f-fo ) / fo (ppm) The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO, at FC. 0 0 accounts for resonator contri- Low-Loss Matching Network to 50 Typical Dimension: 0.010 to 0.047 inch (0.25 to 1.20 mm) Terminal NC NC Terminal Case Design Top View P INCIDENT - P REFLECTED Side View B Bottom View C E (3x) Typical Application Circuits Typical Low-Power Transmitter Application 4 +9VDC F (4x) 200k C1 47 3 A Modulation Input L1 (Antenna) 1 2 G (1x C2 RF Bypass RO3XXXA Bottom View D 470 Millimeters 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 Typical Local Oscillator Applications Output +VDC C1 +VDC L1 C2 RO3XXXA Bottom View www.RFM.com E-mail: info@rfm.com (c)2008 by RF Monolithics, Inc. F .37 .50 .63 .014 .019 .024 G 1.07 1.20 1.33 .042 .047 .052 RF Bypass Page 2 of 2 RO3156A-3 - 9/24/08