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 : BF44A1M 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 temperature 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 zl=2k|?//3pf ta=25?? freq min typ max insertion attenuation reference level 44.00mhz 13.2 14.7 16.2 db b3db - 6.0 - mhz pass bandwith b30db - 7.6 - mhz 41.53mhz - 0.4 - db 46.59mhz - 0.4 db 41.06mhz 1.8 3.0 4.2 db 47.06mhz 1.5 2.7 3.9 db 47.31mhz - 6.2 - db relative attenuation 39.81mhz 37.0 52.0 - db 35.06~40.06mhz 35.0 40 db sidelobe 48.06~55.06mhz 35.0 40 db temperature coefficient -72 ppm/k 3.3 environmental performance characteristics item test condition allowable change of absolute level at center frequency(db) high t emperature test 70?? 500h < 1.0 low temperature test - 40?? 500h < 1.0 h umidity test 40?? 90- 95% 500h < 1.0 thermal shock - 20??==25??==80?? 5 cycl e 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 condition 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 frequency response
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