LT421AW ceramic filter shenzhen luguang electronic technology co.,ltd. 1. this specification shall co ver the characteristics of ceramic filter with 421khz,inten ed for use in transceivers,etc. 2. part number : LT421AW 3. electronical specifications a. centre frequency (f ) : 421khz 1.0khz. max. b. band width at 6 db : 10 khzmin.(to 421khz) c. band width at 50 db : 20 khz max.(to 421khz) d. stop band attenuation : 45 db min.(at f 100khz) e. ripple : 2.0 db max.(at f 5.0khz) f. insertion loss : 4.0 db max (at the smallest loss) g. temprature coefficient of center frenquency : 50ppm/ max.(-20 to +80 ) h. input/output impedance : 1.5 k note : a) center frequency shall be defied as the central value of the band with at 6 db b) temprature coefficient of center frequency shall be defined as the average of the central frequecy. 4. measurement a. 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. b. measuring circuit # s.s.g. (standard signal generation) r.f.v.m. (radio frequency voltage meter) rg+r1=r2=1.5 k c<=50 pf
LT421AW ceramic filter shenzhen luguang electronic technology co.,ltd. 5. dimensions(mm) 6. environmental characteristics 6-1 high temperature exposure subject the filter to +80 for 96 hours. then release the f ilter into the specifications in table 1. 6-2 moisure keep the filter at 40 and 95% rh for 96 hours.then release the filter into the r oom conditions for 1 to 2 hours prior to th e measurement. it shall fulfill the specifications in table 1. 6-3 low temperature exposure subject the filter to -20 for 96 hours. then release the filter into the room conditions for 1 to 2 hours prior to the measurement. it shall fulfill the specifications in table 1. 6-4 temperature cycling subject the filter to a low temperature of -55 for 30 minutes. followsing by a high temperature of +85 for 30 minutes. then release the filter into the room conditions for 1 to 2 hours prior to the mesurement. it shall meet the specifications in table 1. 6-5 resistance to solder heat
LT421AW ceramic filter shenzhen luguang electronic technology co.,ltd. dip the filter terminals no closer than 1.5mm into the solder bath at 270 10 for 10 1 sec. then release the filter into the room conditions for 1 to 2 hours. the filter shall meet the specifications in table 1. 6-6 mechanical shock drop the filter randomly onto the concrete floor from the height of 30cm 3 times.the filter shall fulfill the specifications in table 1. 6-7 vibration subject the filter to th e vibration for 1 hour each in x,y and z axes with the amplitude of 1.5 mm at 10 to 55 hz. the filter shall fulfillthe specifications in table 1. 6-8 lead fatigue 6-8-1 pulling test weight al ong with the directi on of lead without an shock 3 kg. th e filter shall satisfy all the initiall characteristics. 6-8-2 bending test lead shall be subject to withstand against 90 bending in the derection of thickness. this operation shall be don e toward both direction. the filter shall show no evidence of damage and shall satisfy all the initial electrical characteristics. table 1 item specification centre frequency(f ) 421 1.0 khz max band width(6 db) 10 khz min selectivity(50db) 20 khz max stop band attenuation 45 db min ripple 2.0 db max insertion loss 4 db max
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