RFM products are now Murata products. RO3144A • • • • • Designed for 916.5 MHz Transmitters Very Low Series Resistance Quartz Stability Surface-mount Ceramic Case Complies with Directive 2002/95/EC (RoHS) 916.5 MHz SAW Resonator Pb The RO3144A is a one-port surface-acoustic-wave (SAW) resonator packaged in a surface-mount ceramic case. It provides reliable, fundamental-mode quartz frequency stabilization of fixed-frequency transmitters operating at 916.5 MHz. Absolute Maximum Ratings Rating Value CW RF Power Dissipation DC Voltage Between Terminals Case Temperature dBm ±30 VDC -40 to +85 °C 260 °C Soldering Temperature, 10 seconds / 5 cycles maximum Electrical Characteristics Characteristic Sym Frequency, +25 °C Units 0 Notes RO3144A fC RO3144A-1 RO3144A-2 Tolerance from 916.5 MHz 2,3,4,5 RO3144A SM5035-4 Minimum Typical 916.700 916.350 916.650 916.400 916.600 Frequency Aging Unloaded Q IL 2,5,6 1.2 QU 5,6,7 6600 50 Loaded Q QL Turnover Temperature TO Turnover Frequency fO 6,7,8 Frequency Temperature Coefficient FTC Absolute Value during the First Year |fA| 1 5 Motional Resistance RM Motional Inductance LM Motional Capacitance CM Shunt Static Capacitance CO Test Fixture Shunt Inductance 2.5 dB 750 10 DC Insulation Resistance between Any Two Terminals RF Equivalent RLC Model kHz ±100 Insertion Loss Temperature Stability MHz ±150 RO3144A-2 Quality Factor Units ±200 fC RO3144A-1 Maximum 916.300 LTEST Lid Symbolization 25 40 °C fC kHz 0.032 ppm/°C2 ppm/yr <±10 1.0 M 13.1 5, 6, 7, 9 15 µH 2.1 fF 5, 6, 9 2.09 pF 2, 7 14.5 nH RO3144A: 663, RO3144A-1: 897, RO3144A-2: 813, // YYWWS 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 +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. ©2010-2014 by Murata Electronics N.A., Inc. RO3144A (R) 4/24/14 6. 7. 8. 9. Page 1 of 2 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. www.murata.com Electrical Connections Equivalent RLC 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. C Terminal L Terminal C C S C M P C C Case Ground Case Ground P R M S O = 0 .0 5 p F (C a s e P a r a s itic s ) = S A W S ta tic C a p a c ita n c e = C S + C P M Temperature Characteristics The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO, at FC. ELECTRICAL TEST fC = f O , T C = T O -50 -50 -100 -100 -150 -150 -200 0 +20 +40 +60 +80 -200 -80 -60 -40 -20 Case T = TC - 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 Low-Loss Matching Network to 50 2 Terminal G (1 x ) NC NC D Terminal H CW RF Power Dissipation = P INCIDENT - P REFLECTED I Typical Application Circuits I Typical Low-Power Transmitter Application H +9VDC Modulation Input I H J H 200k C1 47 K L1 (Antenna) L PCB Land Pattern Top View C2 RF Bypass RO3XXXA Bottom View 470 Dimensions A Typical Local Oscillator Applications Output +VDC C1 +VDC L1 C2 RO3XXXA Bottom View ©2010-2014 by Murata Electronics N.A., Inc. RO3144A (R) 4/24/14 RF Bypass Page 2 of 2 Millimeters Inches Min Nom Max Min Nom Max 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 - 3.01 - - 0.119 - K - 1.44 - - 0.057 - L - 1.92 - - 0.076 - www.murata.com