unisonic technologies co., ltd pa4867 cmos ic www.unisonic.com.tw 1 of 7 copyright ? 2011 unisonic technologies co., ltd qw-r502-125.b dual 2.1w audio amplifier plus stereo headphone function ? description the utc pa4867 is a stereo audio power amplifier capable of delivering typically 2.1w to a 4 ? load or 2.4w to a 3 ? load each channel with less than 1.0% thd+n using a 5v power supply. utc pa4867 has a new circuit topolopy which can eliminate headphone output coupling capacitors. and an internal input mux allows two sets of stereo inputs to the amplifier. the utc pa4867 has integrated depop circuitry that virtually eliminates transients that cause noise in the speakers during power up and when using the shutdown modes. ? features * operating voltage range v dd =2v~5.5v * output power: -2.4w(typ.)@5v into 3 ? with 1% thd+n max (1khz) -2.1w(typ.)@5v into 4 ? with 1% thd+n max (1khz) * eliminates se-mode output coupling capacitors * shutdown mode available * click and pop reduction circuitry * unity-gain stable * thermal-shutdown protection * input mux control * se/btl mode available ? ordering information ordering number lead free halogen free package packing pa4867l-n20-r PA4867G-N20-R htssop-20 tape reel pa4867l-n20-t pa4867g-n20-t htssop-20 tube pa4867l-p20-r pa4867g-p20-r tssop-20 tape reel pa4867l-p20-t pa4867g-p20-t tssop-20 tube
pa4867 cmos ic unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r502-125.b ? pin configuration 1 2 3 4 5 6 7 shutdown gnd +out a v dd -out a -in a 1 gnd 8 9 10 +in a -in a 2 mux ctrl 20 19 18 17 16 15 14 hp-in gnd +out b v dd -out b -in b 1 bypass 13 12 11 +in b nc -in b 2 ? pin description pin no. pin name i/o pin description 1 shutdown i entire ic into the shutdown mode when this pin connected to the v dd 2, 7, 19 gnd ground 3 +outa o channel a + output in btl mode, high impedance in se mode 4, 17 v dd supply voltage 5 -outa o channel a - output in btl mode, + output in se mode 6 -ina 1 i inverting input of channel a 1 8 +ina i non-inverting input of channe l a, connected to bypass pin inside the ic 9 -ina 2 i inverting input of channel a 2 10 mux ctrl 11 -inb 2 i inverting input of channel b 2 12 nc no connection 13 +inb i non-inverting input of channe l b, connected to bypass pin inside the ic 14 bypass internal mid-supply bias reference bypassing 15 -inb 1 i inverting input of channel b 1 16 -outb o channel b - output in btl mode, + output in se mode 18 +outb o channel b + output in btl mode, high impedance in se mode 20 hp-in i output mode select, connected to the v dd for se mode or gnd for btl mode
pa4867 cmos ic unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r502-125.b ? absolute maximum ratings parameter symbol ratings unit supply voltage 6.0 v input voltage -0.3 ~ v dd +0.3 v power dissipation p d internally limited junction temperature t j 150 operating temperature t opr -40 ~ +85 storage temperature t stg -65 ~ +150 note: 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 the following specifications apply for v dd = 5v unless otherwise specified. limits apply for t a = 25 . parameter symbol test conditions min typ max unit for entire ic supply voltage v dd 2 5.5 v v in =0v, i out =0a, hp-in=0v 7.5 15 ma quiescent power supply current i dd v in =0v, i out =0a, hp-in=4v 3.0 6 ma shutdown current i sd v dd applied to the shutdown pin 0.7 2 a for bridged-mode operation output offset voltage v o(off) v in =0v 5 50 mv r l = 3 ? 2.2 w r l = 4 ? 1.9 w thd=1%, f=1khz r l = 8 ? 1.0 1.1 w r l = 3 ? 3.0 w r l = 4 ? 2.6 w thd+n=10%, f=1khz r l = 8 ? 1.5 w output power p out thd+n=1%, f=1khz, r l =32 ? 0.34 w r l =4 ? , p out =2w 0.3 % total harmonic distortion+noise thd+n 20hz f 20khz, a vd =2 r l =8 ? , p out =1w 0.3 % power supply rejection ratio psrr v dd =5v, v ripple =200mv rms , r l =8 ? , c b =2.2 f 67 db channel separation x talk f=1khz, c b =2.2 f 80 db signal to noise ratio snr v dd =5v, p out =1.1w, r l =8 ? 97 db for single-ended operation output offset voltage v o(off) v in =0v 5 50 mv thd = 0.5%, f = 1khz, r l = 32 ? 75 85 mw thd+n = 1%, f = 1khz, r l = 8 ? thd+n = 1%, f = 1khz, r l = 16 ? thd+n = 1%, f = 1khz, r l = 32 ? 180 165 88 mw output power p out thd+n = 10%, f = 1khz, r l = 16 ? thd+n = 10%, f = 1khz, r l = 32 ? 208 114 mw output voltage swing v out thd = 0.05%,r l = 5k ? 1 v p-p total harmonic distortion+noise thd+n a v =-1, p out =75mw 20hz f 20khz, r l =32 ? 0.2 % power supply rejection ratio psrr c b =2.2 f, v ripple =200mv rms f=1khz 52 db channel separation x talk f=1khz, c b =2.2 f 60 db signal to noise ratio snr v dd =5v, p out =340mw, r l =8 ? 95 db
pa4867 cmos ic unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r502-125.b ? typical application circuit m u x ampam ampas control pin headphone tip ring control pin m u x ampbm ampbs audio input c s 0.1f r i 20k r i 20k c i 0.33f audio input 13 11 20 8 6 -in a 1 +in a v dd 4, 17 -in b 2 -in b 1 +in b 2, 7, 19 20k 20k 20k +out b 12 18 16 -out b +out a 3 20k 20k -out a 5 20k c i 0.33f sleeve gnd c b 2.2f mux ctrl bias control shutdown hp-in 1 10 voltage bypass and de-pop noise bypass 14 c i 0.33f r i audio input 20k 20k r i c i 0.33f audio input 15 r f 20k r f 20k r f 20k r f 20k 9 -in a 2 figure 1. typical audio amplifier application circuit thermal shutdown
pa4867 cmos ic unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r502-125.b ? typical characteristics thd+n vs. frequency thd+n (%) 20 0.010 1 5 0.1 100 1k 10k 20k frequency (hz) v dd =5v, p out =1w r l =8 bridged load, no filters a vd =20 a vd =10 a vd =2 thd+n vs. frequency thd+n(%) 20 0.010 1 5 0.1 100 1k 10k 20k a v =-1 a v =-10 a v =-5 v dd =5v, p out =150mw r l =16 , c o =1000 f single ended, no filters frequency (hz) thd+n vs. output power thd+n (%) 10m 0.010 1 10 0.1 0.1 1 2 output power (w) v dd =5v, r l =8 bridged load a vd =2,bw<80khz f=1khz f=20hz f=20khz thd+n vs. output power thd+n (%) 10m 0.010 1 10 0.1 0.1 0.5 f=20khz f=1khz f=20hz v dd =5v, r l =16 single ended a v = -1, bw<80khz output power (w) 2 2.5 0 2 4 output power vs. supply voltage 5.5 1.75 1.5 1.25 0.75 0.5 1 f=1khz r l =8 ? bridged load bw<80khz 1% thd+n 10% thd+n 0.25 3 3.5 4.5 5 supply voltage (v) output power (w) 8 10 0 1.75 40 output power vs. load resistance 70 1.5 1.25 1 0.75 0.5 1% thd+n 10% thd+n 20 30 50 60 v dd =5v f=1khz a vd =2 bridged load bw<80khz 0.25 load resistance ( ? ) output power (w)
pa4867 cmos ic unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r502-125.b ? typical characteristics(cont.) output power (w) power dissipation (w) -40 0 0 2.5 80 power derating curve 160 temperature ( ) 2 1.5 1 0.5 40 120 power dissipation (w) 0 0.1 0.25 0.3 power dissipation vs. output power output power (w) power dissipation (w) 0.2 0.15 0.1 0.05 0.2 0.4 v dd =5v f=1khz single ended thd+n 1.0% bw<80khz r l =16 r l =32 r l =8 crosstalk (dbr) psrr (db)
pa4867 cmos ic unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r502-125.b ? typical characteristics(cont.) gain (db) phase ( ) supply current (ma) o 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 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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