unisonic technologies co., ltd pa7468 preliminary cmos ic www.unisonic.com.tw 1 of 6 copyright ? 2011 unisonic technologies co., ltd qw-r502-322.b stereo 2.6w audio power amplifier with dc volume control ? description as an audio power amplifier with dc volume control, utc pa7468 is a stereo bridged audio power amplifier. in normal operation it can produce 2.6 ? (1.8w) into 4w with less than 10% (1.0%) thd+n. in utc pa7468 , the attenuator range of the volume control is from 20db ( @ dc_v ol =0v) to -80db ( @ dc_v ol =3.54v) with 32 steps. besides, the utc pa7468 includes the depop circuitry and the thermal shutdown protection circuitry (to reduce pops and clicks noise during power up or shutdown mode operation). the utc pa7468 has a btl mode for speaker drive and a se mode for headphone drive. these tow modes can be quickly chosen by the se/ btl input control pin signal. ? features * low operating current: 9ma * two output modes allowable with btl and se modes(chosen by se/ btl pin) * low current consumption :1ma(in shutdown mode) * with short circuit protection * with thermal shutdown protection * with over current protection circuitry * eliminating turn-on and turn-off tr ansients in outputs by improved depop circuitry to. * very high psrr * 32 steps volume adjustable * btl mode :2.6w per channel output power into 4 ? load at 5v ? ordering information ordering number package packing lead free halogen free pa7468l-s16-r PA7468G-S16-R sop-16 tape reel pa7468l-s16-t pa7468g-s16-t sop-16 tube
pa7468 preliminary cmos ic unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r502-322.b ? pin configuration 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 mute shutdown r in - bypass gnd l in - volume volmax l out - v dd l out + gnd se/btl r out + v dd r out - ? pin description pin no. pin name description 1 mute input pin for mute controlling: low for normal operation; high to mute. 2 shutdown when this pin is pulled low the chip will be into shutdown mode. i sd = 1 a 3 r in - right channel input pin 4 bypass pin for bias voltage generator 5.12 gnd ground 6 l in - left channel input pin 7 volume volume gain setting input signal. 8 volmax pin for setting the maximum output swing. inputting v c to this pin, the output voltage swing will be clamped between v oh - v c & v ol + v c . connecting gnd to this pin will disable the function. for this pin, the max input voltage must be 1/2 v dd . 9 l out - left channel?s negative output in btl mode; high impedance in se mode. 10, 15 v dd supply voltage 11 l out + left channel?s positive output in btl mode and se mode 13 se/ btl output mode control input, high :se output mode ,low :for btl mode. 14 r out + right channel?s positive output in btl mode and se mode 16 r out - right channel?s negative output in btl mode ;high impedance in se mode.
pa7468 preliminary cmos ic unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r502-322.b ? block diagram volmax volume control se/btl shutdown ckt power and depop circuit bypass rin- volume se/btl shutdown lin- lout+ lout- bypass rout+ rout- v dd gnd mute mute 6 3 7 8 1 2 4 9 13 16 14 11 12 5 10 15
pa7468 preliminary cmos ic unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r502-322.b ? absolute maximum rating (unless otherwise specified) parameter symbol ratings unit supply voltage v dd -0.3 ~ +6.0 v input voltage (se/ btl , shutdown , mute) v in -0.3 ~ v dd +0.3 v power dissipation p d internal limited w junction temperature t j 150 c storage temperature t stg -65 ~ +150 c 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 operation is not implied. ? thermal data parameter symbol ratings unit junction to ambient ja 90 c/w ? recommended operating conditions parameter symbol ratings unit supply voltage v dd 4.5 ~ 5.5 v threshold voltage high shutdown , mute v ih 2.0 v se/ btl 4.0 v low shutdown , mute v il 1.0 v se/ btl 1.0 v common mode input voltage v icm v dd -1.0 v ambient temperature t a -40 ~ 85 c ? electrical characteristics ( t a =25c, unless otherwise specified) v dd = 5v parameter symbol test conditions min typ max unit output differential voltage v os 5 mv supply current i dd se/ btl =0v 9 20 ma se/ btl =5v 4 10 ma supply current in shutdown mode i sd se/ btl =0v, shutdown =0v 1 a high input current i ih 900 na low input current i il 900 na operating characteristics, btl mode (v dd = 5v, r l = 4 ? , gain = 2v/v) parameter symbol test conditions min typ max unit maximum output power p out thd+n=10%, f in =1khz r l =3 ? 2.9 w r l =4 ? 2.6 w r l =8 ? 1.6 w thd+n=1%, f in =1khz r l =3 ? 2.4 w r l =4 ? 1.8 w r l =8 ? 1 1.3 w total harmonic distortion plus noise thd+n p out =1.2w, r l = 4 ? , f in =1khz 0.07 % p out =0.9w, r l = 8 ? , f in =1khz 0.08 % power ripple rejection ratio psrr v rr =0.1vrms, r l =8 ? , c b =1 f, f in =120hz 60 db channel separation crosstalk c b =1 f, r l =8 ? , f in =1khz 90 db signal to noise ratio s/n p out =1.1w, r l =8 ? , a weighting 95 db
pa7468 preliminary cmos ic unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r502-322.b ? electrical characteristics(cont.) operating characteristics, se mode (v dd = 5v, gain = 1v/v) parameter symbol test conditions min typ max unit maximum output power p out thd+n=10%, f in =1khz r l = 16 ? 220 mw r l = 32 ? 120 mw thd+n=1%, f in =1khz r l = 16 ? 160 mw r l = 32 ? 95 mw total harmonic distortion plus noise thd+n p out =125mw, r l = 16 ? , f in =1khz 0.09 % p out =65mw, r l = 32 ? , f in =1khz 0.09 % power ripple rejection ratio psrr v in =0.1vrms, r l =8 ? , c b =1 f, f in =120hz 60 db channel separation crosstalk c b =1 f, r l =32 ? , f in =1khz 60 db signal to noise ratio s/n p out =75mw, se, r l =32 ? , a weighting 100 db ? volume control table_btl mode (supply voltage v dd =5v) gain(db) high(v) low(v) hysteresis(mv) recommended voltage(v) 20 0.12 0.00 0 18 0.23 0.17 52 0.20 16 0.34 0.28 51 0.31 14 0.46 0.39 50 0.43 12 0.57 0.51 49 0.54 10 0.69 0.62 47 0.65 8 0.80 0.73 46 0.77 6 0.91 0.84 45 0.88 4 1.03 0.96 44 0.99 2 1.14 1.07 43 1.10 0 1.25 1.18 41 1.22 -2 1.37 1.29 40 1.33 -4 1.48 1.41 39 1.44 -6 1.59 1.52 38 1.56 -8 1.71 1.63 37 1.67 -10 1.82 1.74 35 1.78 -12 1.93 1.85 34 1.89 -14 2.05 1.97 33 2.01 -16 2.16 2.08 32 2.12 -18 2.28 2.19 30 2.23 -20 2.39 2.30 29 2.35 -22 2.50 2.42 28 2.46 -24 2.62 2.53 27 2.57 -26 2.73 2.64 26 2.69 -28 2.84 2.75 24 2.80 -30 2.96 2.87 23 2.91 -32 3.07 2.98 22 3.02 -34 3.18 3.09 21 3.14 -36 3.30 3.20 20 3.25 -38 3.41 3.32 18 3.36 -40 3.52 3.43 17 3.48 -80 5.00 3.54 16 5
pa7468 preliminary cmos ic unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r502-322.b ? typical application circuit 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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