1.scope saw filter series have broad line up products meeting all broadcast standard including ntsc,pal and secam systems. these filters are composed of two interdigital transducers on a single -crystal. piezoelectrical chip. they are used in electronic equipments such as tv and so on. 2.construction 2.1 dimension and materials type : BF43A2M 0: year(0,1,2,3,4,5,6,7,8,9) b:product in this quarter(a:1~3,b:4~6,c:7~9,d:10~12)
2.2. circuit construction, measurement circuit 3.characteristics standard atmospheric conditions unless otherwise specified , the standard rang of atmospheric conditions for making measurements and tests is as follows; ambient temperature : 15?? to 35?? relative humidity : 25% to 85% air pressure : 86kpa to 106kpa operating temperature rang operating temperature rang is the rang of ambient temperatures in which the filter can be operated continuously. - 10?? ~ +60?? storage tempera ture rang storage temperature rang is the rang of ambient temperatures at which the filter can be stored without damage. conditions are as specified elsewhere in these specifications. - 40?? ~ +70?? reference temperature +25?? 3.1 maximum rating dc voltage vdc 12 v between any terminals ac voltage vpp 10 v between any terminals
3.2 electrical characteristics source impedance zs=50|? load impedance z l =2k|?//3pf t a =25?? item freq min typ max center frequency fo - 43.81 - mhz insertion attenuation reference level 43.81mhz 13.5 15.5 17.5 db b3db - 7.0 - mhz pass bandwidth b30db - 7.8 - mhz 40.31mhz 1.0 2.5 4.0 db 47.31mhz 0.9 2.4 3.9 db 39.31mhz 30.0 35.0 - db relative attenuation 48.31mhz 30.0 37.0 - db 35.06~39.06mhz 32.0 40 db sidelobe 48.56~55.06mhz 32.0 38 db reflected wave signal suppression 1.2 us ? 6.0 us after main pulse (test pulse 250 ns , carrier frequency 43.81 mhz) 42.0 52.0 db feedthrough signal suppression 1.2 us ? 6.0 us after main pulse (test pulse 250 ns , carrier frequency 43.81 mhz) 45.0 54.0 db group delay ripple (p- p) - 80 - ns temperature coefficient - 72 ppm/k 3.3 environmental performance characteristics item test condition allowable change of absolute level at center frequency(db) high temperature test 70?? 1000h < 1.0 low temperature test - 40?? 1000h < 1.0 h umidity test 40?? 90- 95% 1000h < 1.0 thermal shock - 20??==25??==80?? 20 cycle 30m 10m 30m < 1.0 solder temperature test sold temp.260?? for 10 sec. < 1.0 soldering immerse the pins melt solder at 260??+5/- 0?? for 5 sec. more then 95% of total area of the pins should be covered with solder
3.4 mechanical test item test conditi on allowable change of absolute level at center frequency(db) vibration test 600- 3300rpm amplitude 1.5mm 3 directions 2 h each <1.0 drop test on maple plate from 1 m high 3 times <1.0 lead pull test pull with 1 kg force for 30 seconds <1.0 lead bend test 90 o bending with 500g weigh 2 times <1.0 3.5 voltage discharge test item test condition allowable change of absolute level at center frequency(db) surge test between any two electrode <1.0
3.6 frequency response:
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