www.rfm.com e-mail: info@rfm.com page 1 of 5 ?2008 by rf monolithics, inc. SF2178A - 7/7/09 electrical characteristics characteristic sym notes min typ max units center frequency f c 1 168 mhz 1 db bandwidth bw 1 1 20.0 20.9 mhz 3 db bandwidth bw 3 1 22.4 mhz upper -35 db band edge 1 181.7 182.0 mhz lower -35 db band edge 1 154 155.1 mhz insertion loss il 1 12.2 13.5 db passband ripple (p-p) 158 to 178 mhz 1, 2, 3 0.76 1.0 db absolute group delay 168 mhz 0.85 1 s group delay ripple (p-p) 158 to 178 mhz 54 160 ns operating temperature 1 -40 +85 c source impedance 50 ohm vswr to source (matching network) 159.5 to 168.5 mhz 2.3 load impedance 50 ohm vswr to load (matching network) 159.5 to 168.5 mhz 2.2 frequency temperature coefficient -72 ppm/c impedance matching to 50 ? unbalanced external l-c case style sm13365-12 13.3 x 6.5 mm nominal footprint lid symbolization (yy = year, ww = week) rfm SF2178A 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 between any 2 terminals 30 vdc storage temperature range -40 to +85 c suitable for lead-free soldering - maximum soldering profile 260c for 30 s 168 mhz saw filter SF2178A sm13365-12 1. unless noted otherwise, all specifications apply over the operating temperature range with filter soldered to the specified d emonstration 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:
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tuning component values pcb pad layout
www.rfm.com e-mail: info@rfm.com page 4 of 5 ?2008 by rf monolithics, inc. SF2178A - 7/7/09 sm13365-12 case case dimensions electrical connections dimension mm inches min nom max min nom max a 13.08 13.31 13.60 0.515 0.524 0.535 b 6.27 6.50 6.80 0.247 0.256 0.268 c 1.91 2.00 0.075 0.079 d 1.50 0.059 e 0.79 0.031 h 1.0 0.039 p 2.54 0.100 connection term inals input k output e case ground all others 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 12-terminal ceramic surface-mount case 13.3 x 6.5 mm nominal footprint
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