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unisonic technologies co., ltd pa3312 cmos ic www.unisonic.com.tw 1 of 10 copyright ? 2007 unisonic technologies co., ltd qw-r107-055.a dual 2.6w audio power amplifier with four selectable gain settings and input-mux control ? description the utc pa3312 is a monolithic integr ated circuit that stereo bridged audio power amplifiers capable of producing 2.6w into 3 ? with less than 10% thd+n or 1w into 8 ? with less than 0.65% thd+n. this device minimizes the number of external components needed, simplifying the design, and freeing up board space for other features. both of the depop circuitry and the thermal shutdown protection circuitry are integrated in utc pa3312 , that reduce pops and clicks noise during power up or shutdown mode operation . amplifier gain is internally configured and controlled by way of two terminals (gain0 and gain1). btl gain setting of 6 db, 10 db, 15.6db, 21.6db (inverting) are pr ovided, whereas se gain is always configured as 4.1db for headphone drive. a mux control terminal (hp/line) allows selection between the two sets of stereo input signals. to simplify t he audio system design, utc pa3312 combines a stereo bridge-tied loads (btl) mode for speaker drive and a stereo single-end (se) mode for headphone drive into a single chip, where both modes are easily switched by the se/btl input control pin signal. ? features * low operating current with 10ma * compatible with pc 99 desktop line-out into 10k ? load * internal gain control ,which eliminates external gain-setting resistors * 2.6w per channel output power into 3 ? at 5v , btl mode * input mux select terminal * pc-beep input * improves depop circuitry to eliminate turn-on and turn-off transients in output * fully differential input *pb-free plating product number: pa3312l ? ordering information order number normal lead free plating package packing pa3312-n24-r PA3312L-N24-R htssop-24 tape reel pa3312-n24-t pa3312l-n24-t htssop-24 tube
pa3312 cmos ic unisonic technologies co., ltd 2 of 10 www.unisonic.com.tw qw-r107-055.a ? pin configuration ? pin description pin no pin name i/o description 1, 12, 13, 24 gnd ground connection for circ uitry. connected to the thermal pad. 11 bypass tap to voltage divider for internal mid-supply bias generator 2 gain0 i bit 0 of gain control 3 ganin1 i bit 1 of gain control 5 llinein i left-channel line input, selected when se/btl is held low 6 lhpin i left-channel headphone input, selected when se/btl is held high 7, 18 pv dd i power supply for output stage 8 rin i common right input for fully differential input. ac ground for single-ended inputs. 10 lin i common left input for fully differential input. ac ground for single-ended inputs. 14 pc-beep i for pc beep mode. pc-beep is enabled when a > 1.5-v (peak-to-peak) square wave is input 17 hp/line i hp/line is the input mux control input. when the hp/line terminal is held high, the headphone inputs (lhpin or rhpin [6, 20]) are active. when the hp/line terminal is held low, the line inputs (llinein or rlinein [5, 23]) are active. 15 se/btl i hold se/btl low for btl mode and hold high for se mode. 19 v dd i analog v dd input supply. this terminal needs to be isolated from pv dd to achieve highest performance. 20 rhpin i right-channel headphone input, selected when se/btl is held high 23 rlinein i right-channel line input, selected when se/btl is held low 22 shutdown i places entire ic in shutdown mode when held low, except pc-beep remains active 4 l out+ o left-channel positive output in btl mode and positive output in se mode 9 l out- o left-channel negative output in btl mode and high-impedance in se mode 21 r out+ o right-channel positive output in bt l mode and positive output in se mode 16 r out- o right-channel negative output in btl mode and high-impedance in se mode
pa3312 cmos ic unisonic technologies co., ltd 3 of 10 www.unisonic.com.tw qw-r107-055.a ? block diagram
pa3312 cmos ic unisonic technologies co., ltd 4 of 10 www.unisonic.com.tw qw-r107-055.a ? absolute maximum rating over operating free-air temper ature range (unless otherwise specified) parameter symbol ratings unit supply voltage v dd 6 v input voltage v in -0.3~v dd ~+0.3 v power dissipation p d internally limited operating junction temperature t opr -40 ~ +85
storage temperature t stg -65 ~ +85
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. ? recommended operating conditions parameter symbol min max unit supply voltage v dd 4.5 5.5 v se/btl, hp/line, gain0, gain1 0.8 ? v dd high-level input voltage v ih shutdown 2 v se/btl, hp/line 0.6 ? v dd gain0, gain1 0.4 ? v dd low-level input voltage v il shutdown 0.8 v operating free-air temperature t a -40 85
? operating characteristics v dd = 5 v, t a = 25 , r
l = 8 ? , gain = 6 db, btl mode parameter symbol test conditions min typ max unit thd+n=10% 2.6 output power p out r l = 3 ? thd+n=1% 2.05 w total harmonic distortion plus noise tdh+n p out = 1 w, f = 20 hz ~ 15 khz 0.65% maximum output po wer bandwidth b om thd = 5% >15 khz supply ripple rejection ratio rr f = 1 khz, c b = 0.47 f btlmode 72 db signal-to-noise ratio snr 105 db btlmode 20 noise output voltage en c b =0.47f, f=20hz ~ 20khz se mode 18 v rms ? electrical characteristics t a = 25
, v dd = 5 v, unless otherwise specified parameter symbol test conditions min typ max unit output offset voltage (measured differentially) |v o(off) | v in = 0, a v = 6 db 25 mv power supply rejection ratio psrr v dd = 4.5 v ~ 5.5 v 77 db high-level input current |i ih | v dd = 5.5 v, v in = v dd 1 a low-level input current |i il | v dd = 5.5 v, v in = 0 v 1 a btl mode 6 10 supply current i dd se mode 3 5 ma supply current, shutdown mode i dd(sd) 150 300 a
pa3312 cmos ic unisonic technologies co., ltd 5 of 10 www.unisonic.com.tw qw-r107-055.a ? typical application circuit r mux volume control pc- beep rhpin rlinein rin pc-beep rout+ rout- volume control l mux se/bel hp/line lhpin llinein lin volume control gain/ mux control depop circuitry gain0 gain1 volume control 100k $ 100k $ c outr 330 f 1k $ power manag ement c lutl 330 f c sr 0.1 f v dd v dd c sr 0.1 f see note a to system control 1, 12, 13, 24 22 11 19 18 4 lout+ lout- 9 gnd shut down bypass v dd pv dd 16 21 v dd 1k $ c byp 0.47 f 10 5 6 15 17 2, 3 14 8 23 20 c irhp 0.47 f a. a 0.1-f ceramic capacitor should be placed as close as possible to the ic. for filtering lower frequency noise signals, a larger electrolytic capacitor of 10 f or greater should be placed near the audio power amplifier. c irline 0.47 f c rin 0.47 f c pcb 0.47 f c ilhp 0.47 f c illine 0.47 f c lin 0.47 f left line input signal pc- beep input signal left head ? phone input signal right line input signal right head ? phone input signal typical pa3312 application circuit using single-ended inputs and input mux
pa3312 cmos ic unisonic technologies co., ltd 6 of 10 www.unisonic.com.tw qw-r107-055.a ? typical application circuit(cont.) r mux volume control pc- beep rhpin rlinein rin pc-beep rout+ rout- volume control l mux se/bel hp/line lhpin llinein lin volume control gain/ mux control depop circuitry gain0 gain1 volume control 100k $ 100k $ c outr 330 f 1k $ power manag ement c lutl 330 f c sr 0.1 f v dd v dd c sr 0.1 f see note a to system control 1, 12, 13, 24 22 11 19 18 4 lout+ lout- 9 gnd shut down bypass v dd pv dd 16 21 v dd 1k $ c byp 0.47 f 10 5 6 15 17 2, 3 14 8 23 20 c irhp 0.47 f a. a 0.1-f ceramic capacitor should be placed as close as possible to the ic. for filtering lower frequency noise signals, a larger electrolyt ic capacitor of 10 f or greater shoul d be placed near the audio power amplifier. c irin- 0.47 f c rin+ 0.47 f c pcb 0.47 f c ilhp 0.47 f c ilin- 0.47 f c lin 0.47 f left positive differential input signal right positive differential input signal left negative differential input signal right negative differential input signal pc-beep input signal typical pa3312 application circuit using differential inputs
pa3312 cmos ic unisonic technologies co., ltd 7 of 10 www.unisonic.com.tw qw-r107-055.a ? typical characteristics 0.01% 0.1% 1% 10% 20 100 1k 10k 20k total harmonic distortion plus noise vs. frequency frequency, f (hz) thd+n ? total harmonic distortion + noise p out =1.0w p out =1.75w p out =0.5w r l =3 $ g v =6db btl 0.01% 0.1% 1% 10% 0.01 0.1 1 10 total harmonic distortion plus noise vs. output power output power, p out (w) thd+n ? total harmonic distortion + noise r l =3 $ g v =6db btl f=20hz f=1khz f=15khz thd+n ? total harmonic distortion + noise thd+n ? total harmonic distortion + noise 0 30 80 100 10 100 1k 10k output noise voltage vs. bandwidth bandwidth, b w (hz) output noise voltage, v n ( v) v dd =5v r l =4 $ 10 20 40 50 60 90 g v =21.6db g v =6db g v =15.6db -120 -80 -20 0 20 100 1k 10k supply ripple rejection ratio vs. frequency supply ripple rejection ratio (db) -100 -60 -40 frequency, f (hz) 20k r l =8 $ c b =0.47 f g v =6db btl 70
pa3312 cmos ic unisonic technologies co., ltd 8 of 10 www.unisonic.com.tw qw-r107-055.a ? typical characteristics(cont.) -120 -80 -20 0 20 100 1k 10k supply ripple rejection ratio vs. frequency -100 -60 -40 frequency, f (hz) 20k r l =32 $ c b =0.47 f g v =4.1db se -120 -80 -20 0 20 100 1k 10k crosstalk vs. frequency -100 -60 -40 frequency, f (hz) 20k p out =1w r l =8 $ g v =6db btl left to right right to left -120 -80 -20 0 20 100 1k 10k crosstalk vs. frequency crosstalk (db) -100 -60 -40 frequency, f (hz) 20k v out =1 v rms r l =10k $ g v =4.1db se left to right right to left -120 -80 -20 0 20 100 1k 10k shutdown attenuation vs. frequency shutdown attenuation (db) -100 -60 -40 frequency, f (hz) 20k v in =1 v rms r l =10k $ , se r l =32 $ , se r l =8 $ , btl 60 80 120 140 20 100 1k 10k signal-to-noise ratio vs. frequency signal-to-noise ratio, snr (db) 70 100 110 frequency, f (hz) 20k p out =1w r l =8 $ btl 90 130 g v =6db g v =21.6db g v =15.6db -10 -5 5 10 10 100 1k 10k closed-loop response gain (db) -7.5 0 2.5 frequency, f (hz) 1m -2.5 7.5 100k 180 90 0 -90 -180 r l =8 $ g v =6db btl phase phase gain
pa3312 cmos ic unisonic technologies co., ltd 9 of 10 www.unisonic.com.tw qw-r107-055.a ? typical characteristics(cont.) -10 0 20 30 10 100 1k 10k closed-loop response -5 10 15 frequency, f (hz) 1m 5 25 100k 180 90 0 -90 -180 r l =8 $ g v =15.6db btl phase gain -10 0 20 30 10 100 1k 10k closed-loop response -5 10 15 frequency, f (hz) 1m 5 25 100k 180 90 0 -90 -180 r l =8 $ g v =21.6db btl phase gain output power, p out (w) output power, p out (mw) power dissipation, p d (w) power dissipation, p d (w)
pa3312 cmos ic unisonic technologies co., ltd 10 of 10 www.unisonic.com.tw qw-r107-055.a 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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