? 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. RF1408D- 9/14/07 electrical characteristics characteristic sym notes minimum typical maximum units center frequency at 25c absolute frequency f c 1, 2, 3 447.7 mhz insertion loss il min 1, 3 1.5 2.0 db 3 db bandwidth bw 3 1, 3 500 840 1100 khz rejection attenuation: (relative to ilmin) 10 - 409 mhz 1, 3 45 60 db 409 - 434 mhz 40 55 434 - 443 mhz 33 35 443 - 445 mhz 20 33 445 - 446.7 mhz 9 12 448.7 - 449.7 mhz 9 15 449.7 - 456 mhz 16 20 456 - 458 mhz 31 38 458 - 487 mhz 38 40 487 - 1000 mhz 39 55 temperature freq. temp. coefficient ftc 0.032 ppm/c 2 frequency aging absolute value during the first year lfal 5 10 ppm/yr impedance @ fc input z in =r in llc in z in 1 221.86 w // 1.25pf output z out =r out llc out z out 172.02 w // 126.49ff lid symbolization (y=year ww=week s=shift) 511 // ywws standard reel quantity reel size 7 inch 9 500 pieces/reel reel size 13 inch 3000 pieces/reel ? ideal front-end filter for domestic wireless receivers ? low-loss, coupled-resonator quartz design ? simple external impedance matching ? complies with directive 2002/95/ec (rohs) the RF1408D is a low-loss, compact, and economical surface-acoustic-wave (saw) filter designed to pro- vide front-end selectivity in 447.7 mhz receivers. receiver designs using this filter include superhet with 10.7mhz or 500khz if, direct conversion and superregen. typical applications of these receivers are wire- less remote-control and security devices (especially for automotive keyless entry) operating in the usa under fcc part 15, in canada under rss-210, and in italy 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. 447.7 mhz saw filter RF1408D sm3838-8 case 3.8 x 3.8 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 and band- width 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 of -40c to +90c. 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. 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. 9. tape and reel standard per ansi / eia 481. pb
447.7 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. RF1408D- 9/14/07 7 6 5 4 1 2 3 8 input output 10nh 22nh 6.8pf 6.8pf 7.5nh 22nh absolute maximum ratings rating value units input power level 10 dbm dc voltage 12 vdc storage temperature -40 to +125 c operable temperature range -40 to +125 c soldering temperature (10 seconds / 5 cycles max.) 260 c pin connection 1 input 2 input ground 3 input ground 4 case ground 5 output 6 output ground 7 output ground 8 case ground matching circuit to 50 w electrical connections a 1 2 3 b 7 6 5 4 c h 7 6 5 4 e f g 1 2 3 8 8 d pin connection 1 input ground 2 input 3 input ground 4 case ground 5 output ground 6 output 7 output ground 8 case ground optional electrical connections matching circuit to 50 w 7 6 5 4 1 2 3 8 output 10nh 22nh 6.8pf input 6.8pf 7.5nh 22nh dimension mm inches min nom max min nom max a 3.6 3.8 4.0 0.14 0.15 0.16 b 3.6 3.8 4.0 0.14 0.15 0.16 c 1.00 1.20 1.40 0.04 0.05 0.055 d 0.95 1.10 1.25 0.037 0.043 0.05 e 0.90 1.0 1.10 0.035 0.04 0.043 f 0.50 0.6 0.70 0.020 0.024 0.028 g 2.39 2.54 2.69 0.090 0.100 0.110 h 1.40 1.75 2.05 0.055 0.069 0.080 case dimensions
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