1.scope this specification shall cover the charac teristics of the ceramic filter with 455khz. 2.part no. : LTC455EU 3.electrical specification item specifications 3-1 center frequency (fo) 455khz 1.5khz 3-2 insertion loss(db) 6.0db max. 3-3 ripple (db) 2.0db max.( 5khz) 3-4 band width (6db) 7.5khz min. 3-5 selectivity (40db) 15.0khz max. 3-6 stop band attenuation 27db min.(fo 100khz) 3-7 input / output impedance 1.5k 3-8 temperature coefficient of center frequency 50ppm/ max. (-20 to +80) note.: a). center frequency shall be de fined as the central value of the band width at 6db. b). temperature coefficient of center frequency shall be defined as the average of th e central frequency sh ift throughout the specified temperature range. 4.measurement 4-1 environmental condition measurement shall be carried out at the reference temperature of 25 2 . it shall be possibly done at 5 to 35 unless it is questionable. 4-2 measuring circuit LTC455EU ceramic filter http://www.luguang.cn mail:lge@luguang.cn
5.dimensions (unit : mm) 6.environmental characteristics 6-1 humidity keep the filter at 40 2 and 90 to 95% rh for minimum 8 hours. then, release the filte r into the room conditions for 1 hour prior to the measurement. it shall fulfill the electrical specifications in section 3. 6-2 vibration subject the filter to th e vibration for 1 hour each in x, y and z axes with the amplitude of 1.0mm at 10 to 55hz. it shall fulfill the electrical specifications in section 3. 6-3 mechanical shock drop the filter randomly onto a concrete floor from the height of 30cm 3 times. it shall fulfill the electrical specifications in section 3. 6-4 solder heat ? resistance the filters shall be assembled to the 1mm ?through-hole? p.c. board and placed in a solder soluti on (su 63% & pb 37%) at 250 10 twice for duration of 3 seconds. after removal fr om the solder solution chamber, the filters may be cleaned with chlorofo rm and left for more that 24 hours at the room temperature. it shall fulfill the electrical specifications in section 3. 6-5 high temperature exposure put subject filter to chamber at 80 5 for 96 4 hours. then, release the filter into the room condition for 1 hour prior to the measurement. it shall meet the electrical specifications in section 3. LTC455EU ceramic filter http://www.luguang.cn mail:lge@luguang.cn
6-6 low temperature exposure put subject filter to ?20 5 for 96 4 hours. then, release the filter into the room conditions for 1 hour prior to the measurement. it shall fulfill the electrical specifications in section 3. 6-7 temperature cycling subject filter is put into low temperature of -20 for 30 minutes, followed by a high temperature of +85 for 30 minutes. cycling shall be repeated 5 times with a time interval of 15 minutes under room conditions. then, release the filter into the room conditions for 1 hour prior to the measurement. it shall fulfill the electrical specifications in section 3. 6-8 lead fatigue 6-8-1 pulling test weight 3kg along to the direction of lead without a sudden shock. the filter shall show no evidence of damage and shall satisfy all the initial characteristics. 6-8-2 bending test lead shall be subject to withstand against 90 bending in the direction of thickness. this operation shall be done towards both directions. the filter shall show no evidence of damage and shall satisfy all the initial electrical characteristics. 7.package form LTC455EU ceramic filter http://www.luguang.cn mail:lge@luguang.cn
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