RP1285 916.55 MHz • • • • SAW Resonator Ideal for 916.5 MHz FCC Part 15.249 Transmitters Nominal Insertion Phase Shift of 180° at Resonance Quartz Stability Rugged, Hermetic, Low-Profile TO39 Case The RP1285 is a two-port, 180° surface-acoustic-wave (SAW) resonator in a low-profile TO39 case. It provides reliable, fundamental-mode, quartz frequency stabilization of fixed-frequency transmitters operating at 916.5 MHz. The RP1285 is designed specifically for remote-control and data-link transmitters operating in the USA under FCC Part 15.249 regulations and in Canada under DoC RSS-210. TO39-3 Case Electrical Characteristics Characteristic Center Frequency (+25°C) Sym fC Absolute Frequency Tolerance from 916.550 MHz ∆fC 2, 3, 4, 5, 2, 5, 6 Unloaded Q IL QU 50 Ω Loaded Q QL Turnover Temperature TO Turnover Frequency fO Insertion Loss Quality Factor Temperature Stability Frequency Temp. Coefficient Frequency Aging Absolute Value during First Year FTC |fA| DC Insulation Resistance between Any Two Pins RF Equivalent RLC Model Notes Minimum 916.400 7.5 5, 6, 7 Motional Inductance LM Motional Capacitance CM Shunt Static Capacitance CO Lid Symbolization (in addition to Lot and/or Date Codes) Units 916.700 MHz ±150 kHz 10.0 dB 53 °C 3,800 23 6, 7, 8 6 5 Maximum 6,500 38 fC+5.7 kHz 0.037 ppm/°C2 ≤ 10 ppm/yr 1.0 RM Motional Resistance Typical MΩ 137 5, 7, 9 217 µH 155.005 fF 0.194528 5, 6, 9 1.7 2.0 Ω 2.3 pF RFM P1285 CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. Notes: 1. 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. 2. The frequency f C is the frequency of minimum IL with the resonator in the specified test fixture in a 50 Ω test system with VSWR ≤ 1.2:1. Typically, fOSCILLATOR or fTRANSMITTER is less than the resonator fC. 3. One or more of the following United States patents apply: 4,454,488; 4,616,197. 4. Typically, equipment utilizing this device requires emissions testing and government approval, which is the responsibility of the equipment manufacturer. 5. Unless noted otherwise, case temperature TC = +25°C± 2°C 6. The design, manufacturing process, and specifications of this device are subject to change without notice. 7. Derived mathematically from one or more of the following directly measured parameters: fC , IL, 3 dB bandwidth, fC versus TC, and CO. 8. 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 20° less than the specified resonator TO. 9. This equivalent RLC model approximates resonator performance near the resonant frequency and is provided for reference only. The capacitance CO is the measured static (nonmotional) capacitance between either pin 1 and ground or pin 2 and ground. The measurement includes case parasitic capacitance. RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 ©1998 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. E-mail: [email protected] http://www.rfm.com RP1285-120298 Page 1 of 2 916.55 MHz SAW Resonator Absolute Maximum Ratings Rating Value Units +5 dBm ±30 VDC -40 to +85 °C CW RF Power Dissipation (See: Typical Test Circuit) DC Voltage Between Any Two Pins (Observe ESD Precautions) Case Temperature Electrical Connections This two-port, three-terminal SAW resonator is bidirectional. However, impedances and circuit board parasitics may not be symmetrical, requiring slightly different oscillator component-matching values. Equivalent LC Model The following equivalent LC model is valid near resonance: 2 1 LM R Bottom View Connection 1 2 3 C M M Co Co Pin 1 Input or Output Output or Input Case Ground 3 Pin 2 Temperature Characteristics Pin 3 fC = f O , TC = T O Typical Test Circuit Power Test Electrical Test 0 The curve shown on the right accounts for resonator contribution only and does not include LC component temperature contributions. (f-fo ) / fo (ppm) Pin 0 -50 -50 -100 -100 -150 -150 -200 -80 -60 -40 -20 -200 0 +20 +40 +60 +80 ∆T = TC - TO ( °C ) 2 1 50 Ω Source at P REFLECTED F C Low-Loss Matching Network to 50 Ω From 50Ω Network Analyzer 1 2 To 50Ω Network Analyzer 3 3 Typical Frequency Response The plot shown below is a typical frequency response for the RP series of two-port resonators. The plot is for RP1094. - P CW RF Power Dissipation = P REFLECTED INCIDENT 200.0 -10.0 100.0 Typical Application Circuits -100.0 S21 magn.(dB) This SAW resonator can be used in oscillator or transmitter designs that require 180° phase shift at resonance in a two-port configuration. Oneport resonators can be simulated, as shown, by connecting pins 1 and 2 together. However, for most low-cost consumer products, this is only recommended for retrofit applications and not for new designs. Conventional Two-Port Design: 0.0 -20.0 -30.0 -200.0 -300.0 -40.0 -400.0 S21 phase (deg.) P INCIDENT -500.0 Simulated One-Port Design: -50.0 -600.0 -700.0 -60.0 1 Phasing Phasing & Match & Match 2 901.2 -800.0 905.2 909.2 913.2 917.2 921.2 925.2 929.2 Frequency (MHz) 3 Millimeters Inches Dimensions Min Case Design C G B A 9.30 B 3.18 C H F E A D (3 places) 2.50 RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-9148 ©1998 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. Max 0.366 0.125 0.098 0.138 0.46 Nominal 0.018 Nominal E 5.08 Nominal 0.200 Nominal F 2.54 Nominal 0.100 Nominal G 2.54 Nominal 0.100 Nominal J 45° 3.50 Min D H J (2 places) Max 1.02 1.40 0.040 0.055 E-mail: [email protected] http://www.rfm.com RP1285-120298 Page 2 of 2