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 : BF44A3M 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 characteristics of channel 1 (switching input pin 2 connected to ground pin 1) source impedance zs=50|? load impedance z l =2k|?//3pf t a =25?? item freq min typ max center frequency fo - 44.00 - mhz insertion attenuation reference level 44.06mhz 12.5 14.5 16.5 db b 1db - 1.6 - mhz b 3db - 1.8 - mhz pass bandwidth b 30db - 2.7 - mhz 35.06~40.26mhz 35.0 42.0 db 40.26~42.56mhz 30.0 38.0 db 45.56~48.66mhz 22.0 30.0 db sidelobe 48.66~55.06mhz 32.0 39.0 db temperature coefficient - 72 ppm/k characteristics of channel 2 (switching input pin 2 connected to input pin 1) source impedance zs=50|? load impedance z l =2k|?//3pf t a =25?? item freq min typ max center frequency fo - 44.00 - mhz insertion attenuation reference level 44.06mhz 13.0 15.0 17.0 db b 1db - 0.8 - mhz b 3db - 1.2 - mhz pass bandwidth b 30db - 2.4 - mhz 35.06~42.66mhz 31.0 39.0 db 45.36~47.36mhz 21.0 29.0 db sidelobe 47.36~55.06mhz 31.0 39.0 db 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 < 1.0
30m 10m 30m 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 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 freque ncy response frequency response of channel 1 (switching input pin 2 connected to ground pin 1)
frequency response of channel 2 (switching input pin 2 connected to input pin 1)
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