RO2181B • • • Very Low Series Resistance Quartz Stability Surface-Mount, Solder Seal Package with 4.8 x 5.2 mm Footprint 868.35 MHz SAW Resonator The RO2181B is a true one-port, surface-acoustic-wave (SAW) resonator in a surface-mount ceramic case. It provides reliable, fundamental-mode, quartz frequency stabilization. Absolute Maximum Ratings Rating CW RF Power Dissipation DC Voltage Between Terminals (Observe ESD Precautions) Case Temperature Soldering Temperature Value +0 ±30 -40 to +85 +250 Units dBm VDC °C °C SM5248-8 Case Electrical Characteristics Frequency (+25 °C) Characteristic Nominal Frequency Tolerance from 868.35 MHz Sym fC DfC Insertion Loss Quality Factor Temperature Stability Frequency Aging Notes 2, 3, 4, 5 IL Unloaded Q QU 50 Ω Loaded Q QL Turnover Temperature TO Turnover Frequency fO FTC Absolute Value during the First Year |fA| Maximum 868.425 Units MHz ±75 kHz 2 dB 18,568 5, 6, 7 1,337 -40 25 +85 0.032 ≤10 1 5 Motional Resistance RM Motional Inductance LM Motional Capacitance CM Shunt Static Capacitance CO 5, 6, 7, 9 LTEST 2, 7 °C fC+16 6, 7, 8 Frequency Temperature Coefficient Test Fixture Shunt Inductance Typical 868.35 2, 5, 6 DC Insulation Resistance between Any Two Terminals RF Equivalent RLC Model Minimum 868.275 1.0 MΩ 5, 6, 7, 9 Lid Symbolization (in Addition to Lot and/or Date Code) ppm/°C2 ppm/yr 69.80 Ω 38.38 µH 0.875 fF 2.59 pF 11.85 nH 296 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 +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 frequency, fC, is measured at the minimum insertion loss point, ILMIN, with the resonator in the 50 Ω 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°C±5°C. The design, manufacturing process, and specifications of this device are subject to change without notice. 7. 8. 9. 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 be calculated as: CP ≈ CO - 0.05 pF. RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 ©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. E-mail: [email protected] http://www.rfm.com RO2181B-111099 Page 1 of 2 868.35 MHz SAW Resonator Electrical Connections This one-port, eight-terminal solder seal resonator is bidirectional. However, impedances and circuit board parasitics may not be symmetrical, requiring slightly different oscillator component-matching values. Pin Connection 1 Ground 2 Input or Output 3 Ground 4 Ground 5 Ground 6 Output or Input 7 Ground 8 Ground Case Design B D E H I A Typical Circuit 45° Input or Output F C 6 5 4 3 7 8 2 G 1 Input or Output 1, 3, 4, 5, 7, 8 No Internal Connection RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 ©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. Dimensions Millimeters Inches A 5.18 .204 B 4.8 .189 C 0.508 .020 D 1.14 .045 E 1.27 .050 F 0.71 .028 G 1.12 .044 H 1.37 .054 I 2.59 .102 E-mail: [email protected] http://www.rfm.com RO2181B-111099 Page 2 of 2