www.rfm.com e-mail: info@rfm.com page 1 of 2 ?2008 by rf monolithics, inc. RF3181D - 3/21/08 electrical characteristics characteristic sym notes minimum typical maximum units center frequency at 25c absolute frequency f c 1, 2, 3 916.5 mhz tolerance from 916.50 mhz d f c khz insertion loss il 1, 3 2.5 4.0 db 3 db bandwidth bw 3 1, 3 500 600 900 khz rejection (attenuation: relative to min il:) 10 to 895 mhz 1, 3 40 50 db 895 to 906 mhz 30 35 906 to 910 mhz 25 30 922 to 925 mhz 35 40 925 to 933 mhz 14 18 933 to 940 mhz 30 35 940 to 1100 mhz 40 45 temperature freq. temp. coefficient ftc 3, 4 0.032 ppm/ c 2 frequency aging absolute value during the first year |fa| 5 10 ppm/yr impedance @ f c input z in = r in /c in z in 1 37 w // 1.6pf output z out = r out /c out z out 25 w // 1.8pf lid symbolization (in addition to lot and/or date codes) 671 // ywws standard reel quantity 7 inch reel 9 500 pieces/reel standard reel quantity 13 inch reel 3000 pieces/reel ? ideal front-end filter for 916.5 mhz wireless receivers ? low-loss, coupled-resonator quartz design ? simple external impedance matching ? complies with directive 2002/95/ec (rohs) the RF3181D is a low-loss, compact, and economical surface-acoustic-wave (saw) filter designed to provide front-end selectivity in 916.5 mhz receivers. receiver designs using this filter include superhet with 10.7 mhz if, direct conversion and superregen. typical applications of these receivers are wireless remote-control and security, data telemetry, and meter reading devices operating in the usa under fcc part 15 and in canada under doc rss-210. 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). 916.5 mhz saw filter RF3181D 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 -40 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 prolo nged 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 sa le. 9. tape and reel standard for ansi/eia 481. pb
www.rfm.com e-mail: info@rfm.com page 2 of 2 ?2008 by rf monolithics, inc. RF3181D - 3/21/08 7 6 5 4 1 2 3 8 input output 8.2 nh 10 nh 7 6 5 4 1 2 3 8 input output 8.2 nh 10 nh 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 ground 2 input 3 ground 4 case ground 5 output ground 6 output 7 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 2 input ground 3 ground 4 case ground 5 output 6 output ground 7 ground 8 case ground electrical connections matching circuit to 50 w optional 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 0.033 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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