RO2131D

RO2131D • • • • • Ideal for 314.370 MHz Automotive Keyless Entry Transmitters Very Low Series Resistance Quartz Stability Complies with Directive 2002/95/EC (RoHS) Tape and Reel Standard per ANSI/EIA-481 RoHS Compliant 314.370 MHz SAW Resonator The RO2131D 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 local oscillators operating at approximately 314.370 MHz. This SAW was designed for AM transmitters in automotive keyless entry applications operating in the USA under FCC Part 15 and in Canada under DoC RSS-210. Absolute Maximum Ratings Rating Value Units Input Power Level 0 dBm DC Voltage 12 VDC -40 to +85 °C 260 °C Storage Temperature Soldering Temperature, 10 seconds / 5 cycles maximum Characteristic Frequency, +25 °C Sym Absolute Frequency Tolerance from 314.370 MHz Insertion Loss Quality Factor Temperature Stability Frequency Aging fC Minimum IL 1.6 6516 Unloaded Q QU 50 Loaded Q QL Turnover Temperature TO Turnover Frequency fO fC Frequency Temperature Coefficient FTC 0.032 Absolute Value during the First Year |fA| Maximum Units 314.420 MHz ±50 kHz 2.5 dB 40 °C 1066 10 25 10 1.0 ppm/°C2 ppm/yr M Motional Resistance RM 20.00  Motional Inductance LM 65.00 µH Motional Capacitance CM 4.00 fF Shunt Static Capacitance CO 3.6 pF 64.6 nH 2.0 LTEST Test Fixture Shunt Inductance Lid Symbolization Standard Reel Quantity Typical 314.320 fC DC Insulation Resistance between Any Two Terminals RF Equivalent RLC Model Notes SM3838-6 Case 440, YWWS Reel Size 7 Inch 500 Pieces / Reel Reel Size 13 Inch 3000 Pieces / Reel 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. RO2131D (R) 11/13/2020 Page 1 of 3 www.rfmi.co Electrical Connections Pin 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. B 1 NC 2 Terminal 3 NC 4 NC 5 Terminal 6 NC G 50  Source at F C 5 E P INCIDENT Low-Loss Matching Network to 50  P REFLECTED 6 1 5 2 4 1 6 D 3 5 4 Typical Low-Power Transmitter Application Modulation Input I 200k  +9VDC C1 47 L1 3 (Antenna) 4 3 2 Typical Application Circuits H 6 440 YWWS A 2 1 C Power Test Connection J 1 6 2 3 5 4 C2 ROXXXXC Bottom View RF Bypass 470 Dimension A B C D E G H I J mm Typical Local Oscillator Application Inches Min Nom Max Min Nom Max 3.60 3.60 1.00 0.95 2.39 0.90 1.90 0.50 1.70 3.80 3.80 1.20 1.10 2.54 1.0 2.0 0.6 1.8 4.0 4.0 1.40 1.25 2.69 1.10 2.10 0.70 1.90 0.14 0.14 0.04 0.037 0.090 0.035 0.75 0.020 0.067 0.15 0.15 0.05 0.043 0.10 0.04 0.08 0.024 0.07 0.16 0.16 0.055 0.05 0.110 0.043 0.83 0.028 0.075 Output 200k  +VDC C1 +VDC L1 1 6 2 3 5 4 C2 ROXXXXC Bottom View RF Bypass Equivalent RLC Model 0.05 pF* Cp Rm Lm Co = Cp + 0.05 pF *Case Parasitics Cm Temperature Characteristics The curve shown on the right accounts for resonator contribution only and does not include LC component temperature contributions. Typical Test Circuit The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO, at FC. fC = f O , T C = T O 1 5 2 4 3 -50 -50 -100 -100 -150 -150 (f-fo ) / fo (ppm) 6 From 50  Network Analyzer 0 0 To 50  Network Analyzer -200 -80 -60 -40 -20 -200 0 +20 +40 +60 +80 T = T C - T O ( °C ) ©2010-2014 by RFM Integrated Device, Inc. RO2131D (R) 11/13/2020 Page 3 of 3 www.rfmi.co Recommended Reflow Profile 1. Preheating shall be fixed at 150~180ºC for 60~90 seconds. 2. Ascending time to preheating temperature 150ºC shall be 30 seconds min. 3. Heating shall be fixed at 220ºC for 50~80 seconds and at 260ºC +0/-5ºC peak (10 seconds). 4. Time: 5 times maximum. ©2010-2014 by RFM Integrated Device, Inc. RO2131D (R) 11/13/2020 Page 3 of 3 www.rfmi.co