unisonic technologies co., ltd pa2308 linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2008 unisonic technologies co., ltd qw-r107-057.a class ab stereo headphone driver ? description as operating on a single 5v supply, the utc pa2308 is capable of delivering 280mw of max. output power to an 8 ? load or 110mw to a 32 ? load with less than 10% (thd+n). the device is very sutible for portable digital audio application. ? features * output power less than 10% thd+n, v dd =5v(typ) --280mw/ch (typical) into a 8 ? load --110mw/ch (typical) into a 32 ? load *very high signal-to-noise ratio *large output voltage swing *good power supply ripple rejection *low power consumption and low distortion *fix wide temperature range *without switch on/off clicks sop-8 lead-free: pa2308l halogen-free: pa2308g ? ordering information ordering number normal lead free plating halogen free package packing pa2308-s08-r pa2308l-s08-r pa 2308g-s08-r sop-8 tape reel pa2308-s08-t pa2308l-s08-t PA2308G-S08-T sop-8 tube
pa2308 linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r107-057.a ? pin configuration ? pin description pin no. pin name i/o pin description 1 v out a o channel a output pin 2 inverting input a i inverting input for channel a 3 non- inverting input a i non-inverting input for channel a 4 v ss ground 5 non- inverting input b i non-inverting input for channel b 6 inverting input b i inverting input for channel b 7 v out b o channel b output pin 8 v dd i supply voltage input pin
pa2308 linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r107-057.a ? block diagram v dd v ss v out a inverting inut a non-inverting input a v out b inverting input b non-inverting input b - + + - 1 2 3 4 5 6 7 8
pa2308 linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r107-057.a ? absolute maximum ratings (t a =25 ) parameter symbol ratings unit supply voltage v dd 7 v junction temperature t j 150 operating temperature t opr -40 to 85 storage temperature t stg -65 to +150 note: absolute maximum ratings are those values beyo nd which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? thermal data parameter symbol min typ max unit junction to ambient ja 210 k/w ? electrical characteristics (t a =25c; unless otherwise specified) v dd =5v, v ss =0v, f=1khz, r l =32 ? parameter symbol conditions min typ max unit supply single 3.0 5.0 6.0 supply voltage dual v dd 1.5 2.5 3.0 v negative supply voltage v ss -1.5 -2.5 -3.0 v supply current i dd no load 2.5 5 ma total power dissipation p d no load 12.5 25 mw dc characteristics input offset voltage v in(off) 5 mv input bias current i bias 10 pa common mode voltage v cm 0 3.5 v closed loop voltage gain gv r l =5k ? 75 db max. output current i out (thd+n)/s<0.1% 140 ma output resistance ro 0.25 ? ac characteristics r l =32 ? (note 1) 0.25 4.75 output voltage swing v out r l =16 ? (note 1) 0.5 4.5 v power supply rejection ratio psrr f in =100hz, v ripple(p.p) =100mv 65 db channel separation cs r l =32 ? 95 db load capacitance c l 200 pf -65 -60 db total harmonic distortion plus noise to signal ratio (thd+n)/s r l =32 ? (note 2) 0.05 0.1 % signal to noise ratio s/n 90 100 db unity gain frequency fg r l =5k ? 5 mhz max.output power p out (thd+n)/s<0.1% 84 mw input capacitance c i 3 pf power bandwidth b unity gain inverting 20 khz note: 1. 2. values are proportional to vdd;(thd+n)/s<0.1% v dd =5v; v out(p-p) =3.5v(at 0db)
pa2308 linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r107-057.a ? typical application 220pf 15k 220 f r l v out a 220pf 15k 15k 15k 2.2 f 2.2 f v in b 1/2v dd (typ.) v ref v in a 220 f r l v out b + - - + 100 f v dd 2 3 5 6 7 4 8 1
pa2308 linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r107-057.a ? typical characteristics 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 specificati ons 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 expected 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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