RO3118A

• • • • • • Designed for 318.0 MHz Transmitters Very Low Series Resistance Quartz Stability Surface-mount Ceramic Case Complies with Directive 2002/95/EC (RoHS) Tape and Reel Standard per ANSI/EIA481 RO3118A RoHS Compliant 318.0 MHz SAW Resonator The RO3118A 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 318.0 MHz. 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 Case Temperature -40 to +85 °C 260 °C Soldering Temperature (10 seconds / 5 cycles maximum) Electrical Characteristics Characteristic Center Frequency, +25 °C Sym fC Absolute Frequency Tolerance from 318.0 MHz Temperature Stability Frequency Aging Typical 317.925 IL 1.5 QU 12000 50 Loaded Q QL 2000 Turnover Temperature TO Turnover Frequency fO fC Frequency Temperature Coefficient FTC 0.032 Absolute Value during the First Year |fA| 10 Unloaded Q DC Insulation Resistance between Any Two Terminals RF Equivalent RLC Model Minimum fC Insertion Loss Quality Factor Notes SM5035-4 10 25 1.0 Maximum Units 318.075 MHz ±75 kHz 2.0 dB 40 °C ppm/°C2 ppm/yr M Motional Resistance RM 19.8  Motional Inductance LM 118 µH Motional Capacitance CM 2.1 fF Shunt Static Capacitance CO 2.9 pF 79 nH Test Fixture Shunt Inductance LTEST Lid Symbolization (YY - Year, WW = Week, S = Shift)) 661, YYWWS CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. NOTES: 1. The design, manufacturing process, and specifications of this device are subject to change. 2. US or International patents may apply. 3. RoHS compliant from the first date of manufacture. ©2010-2014 by RFM Integrated Device, Inc. RO3118A (R) 09/21/2021 Page 1 of 3 www.rfmi.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 Case Ground Case Ground P L Terminal C C C C S C M R M = 0 .0 5 p F (C a s P a r a s t c s ) = S A W S ta t c C a p a c ta n c = C S + C P P S 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 -80 -60 -40 -20 Case -200 0 +20 +40 +60 +80 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 ) ) 1 A POWER TEST P INCIDENT 50  Source P at F C REFLECTED CW RF Power Dissipation = Low-Loss Matching Network to 50  2 Terminal G 1 ) NC NC D Terminal P INCIDENT - P REFLECTED I Typical Application Circuits I Typical Low-Power Transmitter Application H H +9VDC Modulation Input J H 200k  C1 47 K L1 (Antenna) L PCB Footprint C2 RF Bypass RO3XXXA Bottom View Dimensions 470 A Typical Local Oscillator Applications Output +VDC C1 +VDC L1 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 C2 RO3XXXA Bottom View ©2010-2014 by RFM Integrated Device, Inc. RO3118A (R) 09/21/2021 RF Bypass Page 2 of 3 www.rfmi.com Recommended Reflow Profile 1. 2. 3. 4. Preheating shall be fixed at 150~180° for 60~90 seconds. Ascending time to preheating temperature 150° shall be 30 seconds min. Heating shall be fixed at 220°C for 50~80 seconds and at 260°C peak (10 seconds.) Time: 5 times maximum ©2010-2014 by RFM Integrated Device, Inc. RO3118A (R) 09/21/2021 Page 3 of 3 www.rfmi.com