RO2188A ® • • • • • Ideal for 390.0 MHz Transmitters Very Low Series Resistance Quartz Stability Rugged, Hermetic, Surface Mount SM-2 Package Complies with Directive 2002/95/EC (RoHS) 390.0 MHz SAW Resonator The RO2188 is a true one-port, surface-acoustic-wave (SAW) resonator in SM-2 case. It provides reliable, fundamental-mode, quartz frequency stabilization of fixed-frequency transmitters operating at 390.0 MHz. Absolute Maximum Ratings Rating Value Units CW RF Power Dissipation +5 dBm DC Voltage Between Any Two Pins (Observe ESD Precautions) ±30 VDC -40 to +85 °C 260 °C Case Temperature Soldering Temperature (10 seconds / 5 cycles max.) SM-2 Case Electrical Characteristics Characteristic Center Frequency at +25 °C Absolute Frequency Sym fC Tolerance from 304.0 MHz ∆fC 2, 3, 4, 5 IL 2, 5, 6 Unloaded Q QU 50 Ω Loaded Q QL Turnover Temperature TO Insertion Loss Quality Factor Temperature Stability Turnover Frequency Frequency Aging Notes FTC Absolute Value during the First Year |fA| 0.9 Units MHz ±100 kHz 2.0 dB 57 °C 42 fC-5 kHz 0.037 ppm/°C2 ppm/yr 6, 7, 8 ≤10 1 5 Maximum 390.100 1,200 27 DC Insulation Resistance between Any Two Terminals RF Equivalent RLC Model Typical 12,000 5, 6, 7 fO Frequency Temperature Coefficient Minimum 389.900 1.0 MΩ RM Motional Inductance LM Motional Capacitance CM Pin 1 to Pin 2 Static Capacitance CO 5, 6, 9 CP 5, 6, 7, 9 3.65 pF LTEST 2, 7 43 nH Transducer Static Capacitance Test Fixture Shunt Inductance 11 26 Ω Motional Resistance 54.963 5, 7, 9 µH 3.0299 3.6 Lid Symbolization 3.9 fF 4.2 pF E319 CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. Notes: 1. 2. Lifetime (10 year) frequency aging. The center frequency, fC, is measured at the minimum insertion loss point, parameters: fC, IL, 3 dB bandwidth, fC versus TC, and CO. 8. ILMIN, with the resonator in the 50 Ω test system (VSWR ≤ 1.2:1). The shunt quency, fO. The nominal frequency at any case temperature, TC, may be cal- inductance, LTEST, is tuned for parallel resonance with CO at fC. 3. 4. 5. 6. 7. 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±2°C. Turnover temperature, TO, is the temperature of maximum (or turnover) freculated from: f = fO [1 - FTC (TO -TC)2]. 9. 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 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. 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 a floating case. Case parasitic capacitance is approximately 0.25pF. Transducer parallel capacitance can be calculated as: CP ≈ CO - 0.25pF. E-mail: [email protected] http://www.rfm.com RO2188A-062001 Page 1 of 2 390.0 MHz SAW Resonator Equivalent LC Model Electrical Connections 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. Terminal 0.05 pF* Co = Cp + 0.05 pF NC NC Cp *Case Parasitics Terminal Rm Lm Cm Temperature Characteristics The curve shown on the right accounts for resonator contri- The test circuit inductor, LTEST, is tuned to resonate with the static capacitance, CO, at FC. bution only and does not include LC component temperature contributions. ELECTRICAL TEST Network Analyzer 0 -50 -50 -100 -100 -150 -150 -200 -80 -60 -40 -20 Typical Circuit Board Land Pattern To 50 Ω From 50 Ω Network Analyzer fC = f O , T C = T O 0 (f-fo ) / fo (ppm) Typical Test Circuit -200 0 +20 +40 +60 +80 ∆T = T C - T O ( °C ) The circuit board land pattern shown below is one possible design. The optimum land pattern is dependent on the circuit board assembly process which varies by manufacturer. The distance between adjacent land edges should be at a maximum to minimize parasitic capacitance. Trace lengths from terminal lands to other components should be short and wide to minimize parasitic series inductances. (4 Places) Typical Dimension: 0.010 to 0.047 inch (0.25 to 1.20 mm) Case Design The case material is black alumina with contrasting symbolization. All pads are nominally centered with respect to the base and consist of 40 to 70 microinches electroless gold on 60-350 micorinches electroless nickel. Typical Application Circuits Typical Low-Power Transmitter Application +9VDC Modulation Input 200k Ω 47 C1 L1 (Antenna) C2 ROXXXXA Bottom View Millimeters RF Bypass Min 470 Typical Local Oscillator Application Output +VDC C1 ROXXXXA Bottom View Inches Dimensions +VDC L1 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. Max 0.235 B 3.94 0.155 C 2.16 0.085 D 0.94 1.10 0.037 0.043 E 0.83 1.20 0.033 0.047 F 1.16 1.53 0.046 0.060 G 0.94 1.10 0.037 0.043 H 0.43 0.59 0.017 0.023 K 0.43 0.59 0.017 0.023 N RF Bypass Min 5.97 M C2 Max A P 5.31 0.38 0.64 0.209 0.015 3.28 E-mail: [email protected] http://www.rfm.com RO2188A-062001 0.025 0.129 Page 2 of 2