? rf monolithics, inc. phone: (972) 233-2903 fax: (972) 387-8148 e-mail: info@rfm.com page 1 of 2 rfm europe phone: 44 1963 251383 fax: 44 1963 251510 http://www.rfm.com ?1999 by rf monolithics, inc. the stylized rfm logo are registered trademarks of rf monolithics, inc. RF1284-100705 electrical characteristics characteristic sym notes minimum typical maximum units center frequency at 25c absolute frequency f c 1, 2 319.420 319.580 mhz tolerance from 319.500mhz d f c 80 khz insertion loss il 1 2.0 3.0 db 3 db bandwidth bw 3 1, 2 500 600 800 khz rejection at f c - 21.4 mhz (image) 1 40 50 db at f c - 10.7 mhz (lo) 15 40 ultimate 80 temperature operating case temperature t c 3, 4 -40 +85 c turnover temperature t o 15 25 35 c turnover frequency f o f c mhz frequency temperature coefficent ftc 0.032 ppm/c 2 frequency aging absolute value during the first year ifai 5 10 ppm/yr external impedance series inductance l 1 100 nh shunt capacitance c 1 10 pf lid symbolization (in addition to lot and/or date codes) rfm // RF1284 // datecode to39-3 case ? ideal front-end filter for european wireless receivers ? low-loss, coupled-resonator quartz design ? simple external impedance matching ? rugged to39 hermetic package ? 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 319.500mhz receivers. recevier designs using this filter include superhet with 10.7mhz or 500khz if, direct conversion and superregen. this coupled-resonator filter (crf) uses selective null placement to provide suppression, typically greater than 40db, of the lo and image spurious responses of superhet receivers with 10.7mhz if. rfm?s ad- vanced saw design and fabrication technology is utilized to achieve high performance and very low loss with simple external impedance matching (not included). quartz construction provides excellent frequency stabil- ity over a wide temperature range. 319.500 mhz saw filter RF1284 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 w 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 c . note that insertion loss, bandwidth, and passband shape are dependent on the impedance matching component values and quality. 2. the frequency f c is defined as the midpoint between the 3db frequencies. 3. where noted, specifications apply over the entire specified operating temperature range. 4. the turnover temperature, t o , is the temperature of maximum (or turnover) frequency, f o . the nominal frequency at any case temperature, t c , may be calculated from: f=f o [1-ftc(t o -t c ) 2 ]. 5. frequency aging is the change in fc with time and is specified at +65c or less. aging may exceed the specification for prolonge d 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. pb
319.500 mhz saw filter rf monolithics, inc. phone: (972) 233-2903 fax: (972) 387-8148 e-mail: info@rfm.com page 2 of 2 rfm europe phone: 44 1963 251383 fax: 44 1963 251510 http://www.rfm.com ?1999 by rf monolithics, inc. the stylized rfm logo are registered trademarks of rf monolithics, inc. RF1284-100705 absolute maximum ratings typical filter response typical filter responses are shown below. the actual response is depen- dent on external impedance matching and circuit layout. illustrated fre- quencies and minimum rejection for lo and image are shown only for superhet receivers with 10.7 mhz if . electrical connections typical test circuit case design rating value units incident rf power +13 dbm dc voltage between any two pins (observe esd precautions) 30 vdc case temperature 5 -40 to +85 c lo 0 -10 -20 -30 -40 -50 -60 -70 -80 5 mhz/div frequency image amplitude response bottom view pin 1 pin 2 pin 3 pin connection 1 input or output 2 output or input 3 case ground l c c l 2 3 1 from 50 network analyzer w to 50 w network analyzer dimensions millimeters inches min max min max 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 0 db -1 -2 -3 -4 -5 -6 -7 -8 150 khz/div frequency amplitude response min 3db passband at 25 c o min 3db passband at 25c b 45 j (2 places) d (3 places) h g e f c a
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