LA2284 linear integrated circuit 1 5-dot dual led level meter driver description the contek LA2284 is a monolithic integrated circuit designed for 5-dot led level meter drivers with a built-in rectifying amplifier. it is suitable for ac/dc level meters such as vu meters or signal meters. feature *high gain rectifying amplifier included (gv=26db) *low radiation noise when led turns on *logarithmic indicator for 5-dot led of bar type *constant current output(15ma) *wide operating supply voltage(3.5v ~ 16v) *not necessary diode or transistor for alc *minimum number of external parts required sip-9 block diagram absolute maximum ratings (ta=25 c) parameter symbol value unit supply voltage vcc 18 v amplifier input voltage v8 -0.5 ~ vcc v pin 7 voltage v7 6 v d terminal output voltage vd 18 v operating temperature topr -20 to +80 c storage temperature tstg -40 to 125 c power dissipation pd 1100 w contek contek microelectronics co.,ltd. http://www.contek-ic.com e-mail:sales@contek-ic.com
LA2284 linear integrated circuit 2 electrical characteristics (ta=25 c,vcc=6v,f=1khz,unless otherwise specified) parameter symbol test conditions min. typ. max. unit supply voltage vcc 3.5 6.0 16.0 v supply current icc vin=0 5 8 ma sensitivity vin in vc3 level 46 56 66 mv comparator on level 1 vc1 -11.5 -10.0 -8.5 db comparator on level 2 vc2 -6 -5 -4 db comparator on level 3 vc3 0 db comparator on level 4 vc4 2.5 3.0 3.5 db comparator on level 5 vc5 5 6 7 db led output current iled 11.0 15.0 18.5 ma amp gain gv vi=0.1v 24 26 28 db input bias current iino -1.0 -0.3 a test circuit contek contek microelectronics co.,ltd. http://www.contek-ic.com e-mail:sales@contek-ic.com
LA2284 linear integrated circuit 3 application information 1. by changing the time constant c1 and, the response, attack and release time, may be varied. in the above application conditions, power dissipation may be operated at higher levels than the absolute maximum ratings. the wattage of r is to be determined by the total led current and r vlue recommended by the r table. typical performance characteristics contek contek microelectronics co.,ltd. http://www.contek-ic.com e-mail:sales@contek-ic.com
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