? 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. RF1211B-030102 electrical characteristics characteristic sym notes minimum typical maximum units nominal frequency f c 1, 2 315.00 mhz tolerance from 315.0 mhz d fc 80 db insertion loss il 1 1.7 3.0 db 3 db bandwidth bw 3 1, 2 500 700 800 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 temp. t c 3, 4 -40 +85 c turnover temperature t o 22 37 52 c turnover frequency f o f c mhz freq. temp. coefficient ftc 0.032 ppm/c 2 frequency aging absolute value during the first year |fa| 5 10 ppm/yr external impedance series inductance l 1 86 nh (pin 1), 82 nh (pin 2) shunt capacitance c 9 pf lid symbolization (in addition to lot and/or date codes) rfm RF1211B sm8558-8 case ? ideal front-end filter for domestic wireless receivers ? low-loss, coupled-resonator quartz design ? simple external impedance matching ? surface-mount ceramic case with 52mm 2 footprint ? complies with directive 2002/95/ec (rohs) the RF1211B is a low-loss, compact, and economical surface-acoustic-wave (saw) filter designed to pro- vide front-end selectivity in 315.0 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 (not included). our new patent pending solder seal process utilizes a faraday shield lid, which improves out of band rejection. 315.0 mhz saw filter RF1211B 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. unless noted otherwise, 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.
315.0 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. RF1211B-030102 typical filter response typical filter responses are shown below. the actual response is dependent on external impedance matching and circuit layout. il lustrated frequencies and minimum rejection for lo and image are shown only for superhet receivers with 10.7mhz if. absolute maximum ratings rating value units incident rf power +13 dbm dc voltage between any 2 pins (observe esd precautions) 30 vdc case temperature 5 -40 to +85 c soldering temperature (10 seconds / 5 cycles max.) 260 c electrical connections typical test circuit case design pin connection 1 input 2 ground 3 output return 4 case ground 5 output 6 ground 7 input return 8 case ground e (x2) d (x8) p (x4) f (x6) c b a h 3 4 2 1 8 5 6 7 3 2 1 5 6 7 4 8 top view bottom view dimension mm inches min nom max min nom max a 8.26 8.51 8.76 0.325 0.335 0.345 b 5.59 5.84 6.10 0.220 0.230 0.240 c 1.70 2.00 0.067 0.079 d 0.79 0.031 e 1.14 0.045 f 1.98 0.078 h 0.51 0.020 p 2.54 0.100 case dimensions
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