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the information in this document is subject to change without notice. samhop microelectroni cs corp. all rights reserved. ?h? 100 ? 7 7f,no.100,min-chyuan r oad, hsintien, taipei hsien, taiwan, r.o.c. tel: 886-2-2218-3978/2 820 fax: 8 86-2-2218-3320 email : info@samhop.com.tw c samhop microele ctronics corp. 3w stereo audio power amplifier with advanced dc volume control ?????
samhop microele ctronics corp. general description the SM7498HL is a stereo class ab audio power amplifier that drives 3 w/channel of continuous rms power into a 16- ? load. advanced dc volume control minimizes external components.tv and monitor benefit from the integrated feature set that minimizes external components without sacrificing functionality. features * 32-step dc volume control * mute and shutdown mode * short circuit and thermal protection * se and btl selector * 3 w into 16 - ? speakers * input mux * depop circuitry applications * small panel lcd tv * lcd monitors * portable dvd * mini speaker * digital broadcast system pin assignments (top view) 3w stereo audio power amplifier with advanced dc volume control page 1 v.0.2 april 03,2007 volume se/btl hp/line nc rout- rout- rpgnd lpgnd lout- lout- mute shutdown bypass gnd lpv dd lpgnd lout+ lout+ nc lhpin llinein v dd rlinein rhpin rout+ rout+ rpgnd rpv dd SM7498HL 28pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 21 20 19 18 17 16 15 28 27 26 25 24 23 22
samhop microele ctronics corp. pin descriptions pin name lpgnd lout- mute shutdown bypass gnd volume se/btl hp/line i / o - o i i i - i i i o - function - o i i - i i o - no. 1.27 2.3 4 5 6 7 8 9 10 12.13 14,16 15 17.18 19 20 21 22 23 25.26 28 left channel power ground left channel negative audio output right channel positive audio output right channel negative audio output supply voltage terminal for right power stage right channel input, selected when hp/line is held high 3w stereo audio power amplifier with advanced dc volume control power ground rout- rpgnd rpv dd rout+ rhpin rlinein v dd llinein lhpin lout+ lpv dd nc page 2 places the amplifier in shutdown mode if a ttl logic low is placed on this terminal tap to voltage divider for internal midsupply bias generator used for analog reference. terminal for dc volume control. dc voltage range is 0v to 5v output mux control. when this terminal is high, se outputs are selected. when this terminal is low, btl outputs are selected. input mux control. when logic high, rhpin and lhpin inputs are selected. when logic low, rlinein and llinein inputs are selected. right channel power ground right channel input, selected when hp/line is held low supply voltage terminal left channel input, selected when hp/line is held low left channel input, selected when hp/line is held high left channel positive audio output supply voltage terminal for left power stage no connection places the amplifier in mute mode if a ttl logic low is placed on this terminal 11.24 v.0.2 april 03,2007
samhop microele ctronics corp. 3w stereo audio power amplifier with advanced dc volume control maximum ratings (ta = 40~85 o c) v dd v i supply voltage input voltage -0.3 ~ 14.5 - 0.3 ~ v dd +0.3 v v symbol characteristic rating unit page 3 v.0.2 april 03,2007 - t stg t a t j operating free-air temperature range operaing junction temperature range storage temperature range lead temperature 1.6 mm (1/16 inch) from case for 10 seconds - 65 ~150 -40 ~ 85 - 40 ~150 260 o c o c o c o c recommended operating condition high-level input voltage supply voltage characteristic unit min. typ. max. condition symbol v mute , shutdown se/btl , hp/line v ih v low-level input voltage mute , shutdown se/btl , hp/line v il o c operating free-air temperature -- t a v -- v dd 9.0 13.5 4.0 v dd 00.8 -40 85
samhop microele ctronics corp. 3w stereo audio power amplifier with advanced dc volume control operating characteristics (v dd =pv dd =12v, r l =16 ? , gain = 6db, ta = 25 o c unless otherwise noted) output power (2) w mv v rms noise output voltage (3) measured between output and gnd mv thd + n p o =1w, f=1khz, f=20hz to 30khz btl mode % b om maximum output power bandwidth thd=5% khz 1.4 high-level output voltage v oh measured between output and v dd 600 400 v ol low-level output voltage supply current, max power into a 16 ? load i dd output current po=3w, stereo repetitive peak a rms 1.5 total harmonic distortion+noise 0.1 >20 36 gain = 0db,c (byp) =1.0 uf electrical characteristics (v dd =pv dd = 12v, ta = 25 o c unless otherwise noted) high-level input current (se/btl,shutdown,hp/line,mute) 25 characteristic test conditions min. typ. max. unit shutdown current symbol output offset voltage (measured differentially) i dd i sd l lh no load shutdown=0v, se/btl=0v ma ua ma mv v l = v dd = pv dd ua 40 20 mute current imute mute = 0v, se/btl=0v 2.0 v oo gain=20db, se/btl=0v 50 volume 1 150 ua 1 l ll vi= 0v supply current bypass voltage (nominally v dd /2) v (bypass) measured at pin 6,no load (1) v 6 (1) at 9.0v < v dd < 13.5v the dc bypass voltage is approximately v dd /2 (2) output power is measured at the output termi nals of the ic. (3) noise voltage is measured in a bandwidth of 22hz to 22khz. short to gnd current limit i short v in = 0v, r l = 900m ? 1.1 a p o thd+n=1%, f=1khz, r l =16 ? ,btl mode , gain=20db characteristic symbol test conditions min. typ. max. unit 2.7 3.2 1.7 thd+n=10%, f=1khz, r l =16 ? ,btl mode , gain=20db thd+n=1%, f=1khz, r l =8 ? ,se mode , gain=14db thd+n=10%, f=1khz, r l =8 ? ,se mode , gain=14db page 4 v.0.2 april 03,2007 1 low-level input current (se/btl,shutdown,volume, hp/line, mute)
table 1. dc volume control (v dd = 12v, no load, volme pin = 5v) 0 ~ 0.65 0.65 ~ 0.79 0.79 ~ 0.91 0.91 ~ 1.05 1.05 ~ 1.18 1.18 ~ 1.30 1.30 ~ 1.44 1.44 ~ 1.56 1.56 ~ 1.70 1.70 ~ 1.82 1.82 ~ 1.96 1.96 ~ 2.08 -65 -39.5 -37.6 -35.6 -33.5 -31.7 -29.6 -27.7 -25.9 -23.8 -22.1 -20.0 2.08 ~ 2.21 2.21 ~ 2.35 2.35 ~ 2.47 2.47 ~ 2.59 2.59 ~ 2.73 2.73 ~ 2.85 2.85 ~ 2.99 2.99 ~ 3.12 3.12 ~ 3.24 3.24 ~ 3.38 3.38 ~ 3.50 3.50 ~ 3.64 3.64 ~ 3.76 3.76 ~ 3.89 3.89 ~ 4.02 4.02 ~ 4.15 4.15 ~ 4.29 4.29 ~ 4.41 4.41 ~ 4.53 4.53 ~ 5.00 -18.0 -15.9 -13.9 -12.0 -10.0 -7.97 -5.97 -4.00 -2.01 0.01 1.98 3.96 5.97 7.98 9.96 12.0 13.9 15.9 18.0 19.9 -70 -45.4 -43.6 -41.6 -39.5 -37.7 -35.7 -33.7 -32.0 -29.8 -28.1 -26.0 -24.1 -21.9 -20.0 -18.1 -16.0 -14.0 -12.0 -10.0 -8.04 -6.01 -4.05 -2.07 0.05 1.96 3.95 5.95 7.93 9.92 11.9 13.9 voltage on volume pin (v dc ) headphone volume (db) samhop microele ctronics corp. 3w stereo audio power amplifier with advanced dc volume control speaker volume (db) page 5 v.0.2 april 03,2007
samhop microele ctronics corp. 3w stereo audio power amplifier with advanced dc volume control 1 2 3 3 2 1 d c b a 0.1 uf 1.0 uf 1.0 uf 1.0 uf 0.1 uf 1 uf 1.0 uf 5k 9 10 se / btl hp / line mute shutdown 4 5 17 18 12 13 rout + rout + rout - rout - lout - lout - lout + lout + 25 26 2 3 6 bypass 15 , 21 , 28 19 20 22 23 rlinein rhpin llinein lhpin vdd 1 , 7 , 14 , 16 , 27 vdd 8 volume right audio input left audio input SM7498HL + 10 uf application circuit using the SM7498HL in an lcd monitor with 16 ? speaker outputs an d volume control application information figure 1. typical bridge-tied-load(btl) audio amplifier application circuit for an lcd monitor page 6 v.0.2 april 03,2007
samhop microele ctronics corp. 3w stereo audio power amplifier with advanced dc volume control 1 2 3 3 2 1 0.1 uf 1.0 uf 1.0 uf 1.0 uf 0.1 uf 1 uf 1.0 uf 5k 9 10 se / btl hp / line mut e shutdown 4 5 17 18 12 13 rout + rout + rout - rout - lout - lout - lout + lout + 25 26 2 3 6 bypass 15 , 21 , 28 19 20 22 23 rlinein rhpin llinein lhpin vdd 1 , 7 , 14 , 16 , 27 vdd 8 volume right audio input left audio input SM7498HL + 47 0 u f + 47 0 u f + 10 uf application information application circuit using the SM7498HL in an lcd monitor with 8 ? speaker outputs and volume control figure2. typical single-ended (se) audio amplifier applicati on circuit for an lcd monitor page 7 v.0.2 april 03,2007
samhop microele ctronics corp. 3w stereo audio power amplifier with advanced dc volume control functional block diagram 32-step volume control logic control channel-r bypass channel-l rlinein rhpin volume shutdown mute hp/line se/btl llinein lhpin rout+ rout- bypass lout+ lout- page 8 v.0.2 april 03,2007
samhop microele ctronics corp. 3w stereo audio power amplifier with advanced dc volume control thd+n (%) vdd=12v rl = 16 ohms gain = 20db btl mode output power (w) vdd=12v rl = 8 ohms gain = 14db se mode thd+n (%) output power (w) total harmonic distortion +noise vs. output power total harmonic distortion +noise vs. output power total harmonic distortion +noise vs. output power total harmonic distortion +noise vs. output power thd+n (%) thd+n (%) output power (w) output power (w) vdd=13.5v rl = 16 ohms gain = 20db btl mode vdd=9v rl = 16 ohms gain = 20db btl mode figure 3 figure 4 figure 5 figure 6 page 9 v.0.2 april 03,2007 20khz 20hz 1 khz 20khz 100hz 1 khz 20khz 20hz 1 khz 20khz 20hz 1 khz
samhop microele ctronics corp. 3w stereo audio power amplifier with advanced dc volume control total harmonic distortion +noise vs. frequency total harmonic distortion +noise vs. frequency thd+n (%) thd+n (%) frequency (hz) frequency (hz) vdd=12v rl = 16 ohms po = 2w btl mode vdd=12v rl =8 ohms po = 1w se mode closed loop response closed loop response amplitude-db phase-degrees amplitude-db phase-degrees frequency (hz) frequency (hz) vdd=12v rl = 16 ohms gain = 20 db po = 2w btl mode vdd=12v rl = 8 ohms gain = 14 db po = 1 w se mode figure 7 figure 8 figure 9 figure 10 page 10 v.0.2 april 03,2007 6 db 20 db 0 db 14 db
samhop microelectronics corp. 3w stereo audio power amplifier with advanced dc volume control crosstalk vs.frequency output noise voltage vs.frequency amplitude-db frequency(hz) frequency(hz) output noise voltage (uvrms) vdd=12v rl = 16 ohms gain = 20 db po = 1 w btl mode vdd=12v rl = 16 ohms bw = 22hz to 22khz btl mode figure 11 figure 12 page 11 v.0.2 april 03,2007 left to right 20 db 0 db
samhop microelectronics corp. SM7498HL 28 pin hsop ( 150mil ) unit : mm package outline 3w stereo audio power amplifier with advanced dc volume control 12 2.20 max 12 0.089 -c- seating plane d1 18.54 0.13 28 e 9.82 02.0 e1 7.62 0.13 0.35 0.051 5.15 0.10 16.35 0.051 e 0.80 basic 1 2.31 max notes: 1. controlling dimensions are in millimeters (mm) . 2. dimension d1&e1 does not include mold protrusion. 3. coplanarity of all leads sha ll be (before test) 0.089 mm max. from the seating plane. unless otherwise specified. a 0.11 +0.09 -0.06 page 12 v.0.2 april 03,2007

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