unisonic technologies co., ltd la2284/a linear integrated circuit www.unisonic.com.tw 1 of 5 copyright ? 2011 unisonic technologies co., ltd qw-r121-002.c 5-dot dual led level meter driver ? description the utc la2284/a 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. ? features *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 *not necessary diode or transistor for alc *minimum number of external parts required ? ordering information order number lead free halogen free package packing la2284l-g09-t la2284g-g09-t sip-9 tube la2284l-sm2-r la2284g-sm2-r msop-10 tape reel la2284al-g09-t la2284ag-g09-t sip-9 tube la2284al-sm2-r LA2284AG-SM2-R msop-10 tape reel
la2284/a linear integrated circuit unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r121-002.c ? pin configuration ? block diagram
la2284/a linear integrated circuit unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r121-002.c ? absolute maximum ratings (t a =25 c) parameter symbol ratings unit supply voltage v cc 18 v amplifier input voltage v8 -0.5 ~ v cc v pin 7 voltage v7 6 v d terminal output voltage v d 18 v power dissipation p d 1100 w operating temperature t opr -20 ~ +80 c storage temperature t stg -40 ~ +125 c notes: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? electrical characteristics (t a =25 c, v cc =6v, f=1khz, unless otherwise specified) parameter symbol test conditions min typ max unit la2284 3.5 6.0 16.0 v supply voltage la2284a v cc 3.0 6.0 16.0 v supply current i cc v in =0 5 8 ma sensitivity v in in v c 3 level 46 56 66 mv comparator on level 1 v c 1 -11.5 -10.0 -8.5 db comparator on level 2 v c 2 -6 -5 -4 db comparator on level 3 v c 3 0 db comparator on level 4 v c 4 2.5 3.0 3.5 db comparator on level 5 v c 5 5 6 7 db led output current i o(led) 11.0 15.0 18.5 ma amp gain g v v in =0.1v 24 26 28 db input bias current i i(bias) -1.0 -0.3 a
la2284/a linear integrated circuit unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r121-002.c ? test circuit
la2284/a linear integrated circuit unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r121-002.c ? application information by changing the time constant c1 and, the respon se, 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 value recommended by the r table. v cc v cc =10~16v; r=100 ? v cc = 8~14v; r=68 ? v cc =6.5~12v; r=47 ? ? typical characteristic utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expec ted to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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