www.rfm.com e-mail: info@rfm.com page 1 of 5 ?2010 by rf monolithics, inc. sf2257a - 12/13/10 electrical characteristics characteristic sym notes min typ max units center frequency f c 1 69.9 70.0 70.1 mhz 1 db bandwidth bw 1 10.80 0.92 3 db bandwidth bw 3 11 . 11 . 2 40 db bandwidth bw 40 12 . 2 2 . 3 insertion loss il 1 9.2 11.5 db amplitude ripple, f c 0.3 mhz 1, 2, 3 0.7 1.0 db p-p group delay ripple, f c 0.3 mhz 350 400 ns p-p relative attenuation: db dc to 65 mhz 45 55 75 to 200 mhz 45 55 operating temperature range 1 - 55 +90 c impedance matching to 50 ? unbalanced source/load external l-c case style 13.3 x 6.5 mm nominal footprint lid symbolization (yy = year, ww = week) rfm/sf2257a/yyww ? precision if saw filter hermetic 13.3 x 6.5 mm surface-mount case complies with directive 2002/95/ec (rohs) absolute maximum ratings rating value units maximum incident power in passband +10 dbm maximum dc voltage on any non-ground terminal 10 vdc storage temperature range in tape and reel -55 to +90 c suitable for lead-free soldering - maximum soldering profile 260 c for 30 s 70 mhz saw filter sf2257a case 1. unless noted otherwise, all specifications apply over the operating temperature range with filter soldered to the specified demonstration board with impedance matching to 50 ? and measured with 50 ? network analyzer. 2. unless noted otherwise, all frequency specifications are referenced to the nominal center frequency, fc. 3. rejection is measured as attenuation below the minimum il point in the passband. rejection in final user application is depen dent on pcb layout and external impedance matching design. see application note no. 42 for details. 4. part to part absolute delay measurement records the absolute delay mean across 1 db passband. 5. "lrip" or "l" after the part number indicates "low rate initial production" and "eng" or "e" indicates "engineering prototype s.? 6. the design, manufacturing process, and specifications of this filter are subject to change. 7. either port 1 or port 2 may be used for either input or output in the design. however, impedances and impedance matching may vary between port 1 and port 2, so that the filter must always be installed in one direction per the circuit design. 8. us and international patents may apply. pb caution: electrostatic sensitive device. observe precautions for handling. notes: preliminary
www.rfm.com e-mail: info@rfm.com page 2 of 5 ?2010 by rf monolithics, inc. sf2257a - 12/13/10 filter amplitude response plots
www.rfm.com e-mail: info@rfm.com page 3 of 5 ?2010 by rf monolithics, inc. sf2257a - 12/13/10 tuning component values filter group delay plot l1 = 470 + 56 nh, c1 = 82 pf, l2 = 470 + 68 nh, c2 = 82 pf
www.rfm.com e-mail: info@rfm.com page 4 of 5 ?2010 by rf monolithics, inc. sf2257a - 12/13/10 case material materials solder pad plating 0.3 to 1.0 m gold over 1.27 to 8.89 m nickel lid plating 2.0 to 3.0 m nickel body al 2 o 3 ceramic pb free ceramic surface-mount 12-terminal case 13.3 x 6.5 mm nominal footprint electrical connections connection terminals input a output g case ground all others case outline drawing pcb pad layout
www.rfm.com e-mail: info@rfm.com page 5 of 5 ?2010 by rf monolithics, inc. sf2257a - 12/13/10 tape and reel details
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