RO2118A

Features:

• Ideal for 318 MHz Transmitters
• Very Low Series Resistance
• Quartz Stability
• Surface-Mount, Ceramic Case with 21 mm² Footprint
• Complies with Directive 2002/95/EC (RoHS)




Specifications

Characteristic Symbol Minimum Typical Maximum Units Frequency (+25 C) Nominal Frequency fC 317.900 318.100 MHz Tolerance from 318.000 MHz ?fC 100 kHz Insertion Loss IL 0.7 1.5 dB Quality Factor Unloaded Q QU 16900 50 Ohm Loaded Q QL 1300 Temperature Stability Turnover Temperature TO 10 25 40 C Turnover Frequency fO fC Frequency Temperature Coefficient FTC 0.032 ppm/C2 Frequency Aging Absolute Value during the First Year |fA| 10 ppm/yr DC Insulation Resistance between Any Two Terminals 1.0 MOhm RF Equivalent RLC Model Motional Resistance RM 8 19 Ohm Motional Inductance LM 72.2067 uH Motional Capacitance CM 3.46904 fF Transducer Static Capacitance CO 2.9 3.2 3.5 pF Test Fixture Shunt Inductance LTEST 80 nH Lid Symbolization 108

Rating	Value	Units
CW RF Power Dissipation	+0	dBm
DC Voltage Between Terminals	±30	VDC
Case Temperature	-40 to +85
Soldering Temperature (10 seconds / 5 cycles max.)	260

Description

The RO2118A is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount, ceramic case. RO2118A provides reliable, fundamental-mode, quartz frequency stabilization of fixed-frequency transmitters operating
at 318 MHz. This SAW is designed for AM transmitters remote control and wireless security applications operating in the USA under FCC Part 15, in Canada under DoC RSS-210, and in Italy.