RFM products are now Murata products. RF1284 Ideal Front-End Filter for European Wireless Receivers Pb Low-Loss, Coupled-Resonator Quartz Design 319.508 MHz Simple External Impedance Matching Rugged TO39 Hermetic Package SAW Filter Complies with Directive 2002/95/EC (RoHS) The RF1284 is a low-loss, compact and economical surface-acoustic-wave (SAW) filter designed to provide front-end selectivity in 319.508 MHz receivers. Recevier designs using this filter include superhet with 10.7 MHz or 500 kHz IF, direct conversion and superregen. This coupled-resonator filter (CRF) uses selective null placement to provide suppression, typically greater than 40 dB, of the LO and image spurious responses of superhet receivers with 10.7 MHz IF. RFMs advanced SAW design and fabrication technology is utilized to achieve high performance and very low loss with simple external impedance matching (not included). Quartz TO39-3 Case construction provides excellent frequency stability over a wide temperature range. Characteristic Sym Notes Minimum Typical Maximum Units Center Frequency at 25C Absolute Frequency f 319.428 319.588 MHz C 1, 2 Tolerance from 319.500 MHz f 80 kHz C Insertion Loss IL 1 2.0 3.0 dB 3 dB Bandwidth BW 500 600 800 1, 2 kHz 3 Rejection at f - 21.4 MHz (Image) 40 50 c at f - 10.7 MHz (LO) 1 15 40 dB c Ultimate 80 Temperature Operating Case Temperature T -40 +85 C C Turnover Temperature T 15 25 35 C O 3, 4 Turnover Frequency f f MHz O C 2 Frequency Temperature Coefficent FTC 0.032 ppm/C Frequency Aging Absolute Value during the First Year IfAI 5 10 ppm/yr Impedance fc Input Z =R //C Z 1570//6.84pf nH 1 IN IN IN IN Output Z =R //C Z 1490//7.02pf 1 pF OUT OUT OUT OUT Lid Symbolization (in addition to Lot and/or Date Codes) RFM // RF1284 // YYWWS CAUTION: Electrostatic Sensitive Device. Observe precautions for handling. NOTES: 1. Unless noted otherwise, all measurements are made with the filter installed in the specified test fixture which is connected to a 50 test system with VSWR 1.2:1. The test fixture L and C are adjusted for minimum insertion loss at the filter center frequency, f . Note that insertion loss, bandwidth, and passband shape c are dependent on the impedance matching component values and quality. 2. The frequency f is defined as the midpoint between the 3dB frequencies. c 3. Where noted, specifications apply over the entire specified operating temperature range. 4. The turnover temperature, T , is the temperature of maximum (or turnover) frequency, f . The nominal frequency at any case temperature, T , may be O o c 2 calculated from: f = f 1 - FTC (T -T ) . o o c 5. Frequency aging is the change in fc with time and is specified at +65C or less. Aging may exceed the specification for prolonged temperatures above +65C. Typically, aging is greatest the first year after manufacture, decreasing significantly in subsequent years. 6. The design, manufacturing process, and specifications of this device are subject to change without notice. 7. One or more of the following U.S. Patents apply: 4,54,488, 4,616,197, and others pending. 8. All equipment designs utilizing this product must be approved by the appropriate government agency prior to manufacture or sale. 2010-2015 by Murata Electronics N.A., Inc. Copyright Murata Manufacturing Co., Ltd. All Rights Reserved 2007 RF1284 (R) 4/6/15 Page 1 of 6 www.murata.comAbsolute Maximum Ratings Rating Value Units Incident RF Power +13 dBm DC Voltage Between Any Two Pins (Observe ESD Precautions) 30 VDC 5 -40 to +85 C Case Temperature Typical Filter Response Typical filter responses are shown below. The actual response is depen- 0 dent on external impedance matching and circuit layout. Illustrated fre- dB quencies and minimum rejection for LO and IMAGE are shown only for -1 superhet receivers with 10.7 MHz IF. -2 0 -3 -10 -4 Min 3dB LO Min 3dB -20 Passband Passband -5 at 25C o -30 at 25 C -6 -40 Image -7 -50 -8 -60 150 KHz/div Frequency -70 -80 5 MHz/div Case Design Frequency C G Electrical Connections B Bottom View H Pin Connection F Pin 1 Pin 2 A E 1 Input or Output D 2 Output or Input Pin 3 (3 places) 3 Case Ground J (2 places) 45 Typical Test Circuit L L Millimeters Inches 1 2 Dimensions From 50 To 50 Min Max Min Max 3 CC Network Network Analyzer Analyzer A 9.30 0.366 B 3.18 0.125 C 2.50 3.50 0.098 0.138 D 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 H 1.02 0.040 J 1.40 0.055 2010-2015 by Murata Electronics N.A., Inc. Copyright Murata Manufacturing Co., Ltd. All Rights Reserved 2007 www.murata.com RF1284 (R) 4/6/15 Page 2 of 6 Amplitude Response Amplitude Response