? 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. RF1210D-083105 ? 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 RF1210D is a low-loss, compact, and economical surface-acoustic-wave (saw) filter designed to pro- vide front-end selectivity in 303.825 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. 303.825 mhz saw filter RF1210D 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 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 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 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. 9. tape and reel standard per ansi/eia 481. 10. this product complies with directive 2002/95/ec of the european parlament and of the council of 27 january 2003 on the restricti on of the use of certain hazardous sub- stances in electrical and electronic equipment. electrical characteristics characteristic sym notes minimum typical maximum units center frequency @ 25c absolute frequency f c 1, 2, 3 303.825 mhz minimum i.l. (303.620~303.980 mhz) il min 1, 3 1.6 2.5 db passband (relative to il min ) 303.595 - 304.025 1 1.0 3.0 db 303.535 - 304.085 1.5 6.0 pass bandwidth (relative to il min ) bw 3 1, 3 500 650 800 khz attenuatioin: (relative to il min ) 10~260 mhz 1 45 50 db 260~297 mhz 35 40 297~302.5 mhz 11.5 15 304.8~320 mhz 14 18 320~400 mhz 37 40 400~1000 mhz 45 50 frequency temperature coefficient ftc 0.032 ppm/c 2 frequency aging absolute value during the first year |fa| 10 ppm/yr impedance @ f c input z in =r in llc in z in 1 22.6 w ll 2.6pf output z out =r out llc out z out 21.5 w ll 3.1pf lid symbolization (y=year ww=week d=day of week) 488 // ywws standard reel quantity reel size 7 inch 9 500 pieces/reel reel size 13 inch 3000 pieces/reel pb
303.825 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. RF1210D-083105 7 6 5 4 1 2 3 8 input output 5.6pf 6.8pf 91nh 120nh 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 ground 4 case ground 5 output 6 output ground 7 ground 8 case ground matching circuit to 50 w 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 ground 4 case ground 5 output ground 6 output 7 ground 8 case ground optional electrical connections matching circuit to 50 w w 1 2 3 8 input output 7 6 5 4 10pf 0.2pf 100nh 100nh 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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