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the information in this document is subject to cha nge without notice. samhop microelectroni cs corp. all rights reserved. ?h? 100 ? 7 7f,no.100,min-chyuan road, hsintien, taipei hsien, taiwan, r.o.c. tel: 886-2-2218-3978/2820 fax: 886-2-2218-3320 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 SM7516 is a stereo audio power amplifier that drives 3 w/channel of continuous rms power into a 3- ? load. advanced dc volume control minimizes external components and allows btl (speaker) volume control and se (headphone) volume control. notebook and pocket pcs benefit from the integrated feature set that minimizes external components without sacr ificing functionality. to simplify design, the speaker volume level is adjusted by applying a dc voltage to the volume terminal. features * advanced dc volume control with 2-db steps from -40 db to 20 db - maximum volume se tting for se mode - adjustable se volume control referenced to btl volume control * 3 w into 3- ? speakers applications * notebook pc * lcd monitors * portable dvd player * digital photo frame pin assignments (top view) 3w stereo audio power amplifier wi th advanced dc volume control SM7516 hdip 12pin 1 2 3 12 11 10 4 5 6 9 8 7 rlinein llinein lout- v dd lout+ shutdown rout- rout+ se/btl volume gnd bypass page 1 v.0.1 sep 12,2007
samhop microele ctronics corp. pin descriptions 3w stereo audio power amplifier with advanced dc volume control no. pin name i / o function 1 rlinein i right channel input signal. 2llinein i 3 lout - o left channel negative audio output. 4v dd - supply voltage terminal. 5 6 7 8 - 9 se/btl 10 11 12 left channel input signal. lout + o left channel positive audio output. places the amplifier in shutdown mode if a ttl logic low is placed on this terminal. shutdown i bypass tap to voltage divider for internal midsupply bias generator used for analog reference. i power ground. gnd volume i terminal for dc volume control. dc voltage range is 0v to 5v. i output mux control. when this te rminal is high, se outputs are selected. when this terminal is low, btl outputs are selected. rout + o right channel positive audio output. right channel negative audio output. rout - o page 2 v.0.1 sep 12,2007
samhop microele ctronics corp. maximum ratings (ta = 40~85 o c) - v ss v i - t a t j t stg supply voltage, v dd , pv dd input voltage lead temperature 1,6 mm (1/16 inch) from case for 10 seconds -0.3 ~ 6 - 0.3 ~ v dd +0.3 see dissipation rating table -40 ~ 85 - 40 ~ 150 - 65 ~ 150 260 v v - o c o c o c o c symbol characteristic rating unit 3w stereo audio power amplifier with advanced dc volume control storage temperatuer range operating free-air temperature range operaing junction temperature range continous total power dissipation - -- -- -- - - - shutdown shutdown recommended operating condition high-level input voltage supply voltage, v dd , pv dd characteristic unit min. typ. max. condition symbol v 0.8 v dd se/btl v ih 2.0 v ih v low-level input voltage 0.3 v dd se/btl v il 0.6 v il o c -40 85 operating free-air temperature -- t a v 4.0 5.5 -- v ss page 3 v.0.1 sep 12,2007
samhop microele ctronics corp. 3w stereo audio power amplifier with advanced dc volume control electrical characteristics (v dd =pv dd = 5.5v, ta = 25 o c unless otherwise noted) operating characteristics (v dd =pv dd = 5v, r l = 3 ? , gain = 6db, ta = 25 o c unless otherwise noted) characteristic condition min. typ. max. unit output offset voltage (measured differentially) power supply rejection ratio symbol v oo psrr l lh v dd =5.5v,gain=20db, se/btl=0v v dd =pv dd =4.0v to 5.5v 60 mv -42 -70 db v dd =pv dd =5.5v, v l =v dd =pv dd 1ua high-level input current (se/btl,shutdown,volume) - - - - - supply current, no load l ll l dd v dd =pv dd =5.5v , v l =0v 1 ua v dd =pv dd =5.5v,se/btl=0v, shutdown=2v supply current,max power into a 3 ? load supply current,shutdown mode l dd l dd(sd) v dd =pv dd =5.5v,se/bt l=5.5v, shutdown=2v 5.5 8.0 10 3.0 5.0 6.0 ma v dd =5v=pv dd ,se/btl=0v, shutdown=2v,r l =3 ? , p o =2w,stereo 1.5 a rms shutdown=0.0v 1 20 ua low-level input current(se/btl,shutdown,volume) - - - - - symbol characteristic condition min. typ. max. unit output power (1) w p o thd+n=1% 1.9 thd+n=10% 2.3 f = 1khz, r l =4 ? , btl mode , gain =20 db thd+n=1% 1.4 thd+n=10% 1.7 f = 1khz, r l =8 ? , btl mode , gain =20 db - - -- - - - - v oh high-level output voltage r l =8 ? , measured between output and v dd 600 mv v ol low-level output voltage r l =8 ? , measured between output and gnd 400 mv v (bypass) bypass voltage(nominally v dd /2) (2) measured at pin 11, no load, v dd =5.5v 2.65 2.75 2.85 v -- - - thd+n total harmonic distortion+noise p o =1w, r l =8 ? , f=20hz to 20khz < 0.6 % - - 3 - - noise output voltage v rms f= 20 hz to 20 khz, gain=0 db, c (byp) =1.0uf btl 85 (1) output power is measured at the output terminals of the ic. (2) at 4v < v dd < 5.5v the dc bypass voltage is approximately v dd /2 - - v dd =5.5v, f = 1khz, thd+n =10% page 4 v.0.1 sep 12,2007
samhop microele ctronics corp. table 1. dc volume control (btl mode, v dd =5v) 0.00 0.31 0.42 0.54 0.65 0.76 0.87 0.98 1.10 1.21 1.32 1.43 0.23 0.34 0.46 0.56 0.67 0.79 0.90 1.01 1.12 1.24 1.35 1.46 1.54 1.66 1.77 1.88 1.99 2.10 2.21 2.33 2.44 2.55 2.67 2.77 2.89 3.00 3.11 3.22 3.33 3.44 3.55 3.67 1.57 1.68 1.79 1.91 2.02 2.13 2.24 2.35 2.47 2.57 2.70 2.80 2.92 3.03 3.14 3.26 3.37 3.48 3.60 5.00 -85 -40 -38 -36 -34 -32 -30 -28 -26 -24 -22 -20 -18 -16 -14 -12 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 16 18 20 volume gain of amplifier (typ.) to (v) from (v) 3w stereo audio power amplifier with advanced dc volume control page 5 v.0.1 sep 12,2007
application information the figure is schematic diagrams of typical notebook computer application circuits. right speaker cc 1k ? headphones 1k ? cc left speaker v dd 100k ? from dac or potentiometer (dc voltage) figure 1. SM7516 application circ uit using single-ended inputs samhop microele ctronics corp. 3w stereo audio power amplifier with advanced dc volume control page 6 v.0.1 sep 12,2007 12 rout- rout+ 11 se/btl v dd 100k ? volume 10 9 ci right line audio source rlinein 1 left line audio source llinein 2 ci v dd 4 c (byp) cs bypass 7 gnd 8 shutdown system control lout + lout - 63 5
samhop microele ctronics corp. 3w stereo audio power amplifier with advanced dc volume control the ability of the SM7516 to easily switch between btl a nd se modes is one of its most important cost saving features. this feature eliminates the requirement fo r an additional headphone amplifier in applications where internal stereo speakers are driven in btl mode but external headphone or speakers must be accommodated. internal to the SM7516, two separate amplifiers drive out+ and out-. the se/btl input controls the operation of the follower amplifier that drives lout- and rout-. when se/btl is held low, the amplifier is on and the SM7516 is in the btl mode. when se/btl is held high, the out- amplifiers are in a high output impedance state, which configures the SM7516 as an se driver from lout+ and rout+. i dd is reduced by approximately one-third in se mode. control of the se/btl input can be from a logic-leve l cmos source or, more typically, from a resistor divider network as shown in figure 2. the trip level for the se/btl input can be found in the recommended operating condition table. se/btl operation application information (continued) + _ rout+ rout- rlinein + _ + _ se/btl byp en byp 100k ? 100k ? v dd co 330 f 1k ? lout+ figure 2. SM7516 resistor divider network circuit byp using a 1/8-in. (3,5mm) stereo headphone jack, the control switch is closed when no plug is inserted. when closed the 100k ? /1k ? divider pulls the se/btl input lo w. when a plug is inserted, the 1k ? resistor is disconnected and se/btl input is pulled high. when the input goes high, the out- amplifier is shut down causing the speaker to mute (open-ci rcuits the speaker). the out+ amp lifier then drives through the output capacitor (c o ) into the headphone jack. page 7 v.0.1 sep 12,2007
table of graphs thd+n total harmonic distortion plus noise(btl) vs frequency vs output power 3,4,5 6,7,8 9,10 11,12 closed loop response 13 vs frequency vs frequency figure crosstalk psrr power supply ripple rejection(btl) samhop microelectronics corp. 3w stereo audio power amplifier wi th advanced dc volume control volume operation the volume controls the btl volume when driving speakers and the se volume when driving headphones. the pin is controlled with a dc voltage, which should not exceed v dd . when driving speakers in btl mode, the volume pin is t he only pin that controls t he gain. table 1 shows the gain for the btl mode. the volt age listed in the table are for v dd =5v. for a different v dd , the values in the table scale linearly. if v dd =4v, multiply all the voltages in the table by 4v/5v or 0.8. some audio systems require that the gain be limited in the single-ended mode to a leve l that is comfortable for headphone listening. most volume control devices only have on e terminal for setting the gain. for example, if the speaker gain is 20 db, the gain in the headphone channel is fixed at 14 db. table 1 show a range of voltages for each gain step. th ere is a gap in the voltage between each gain step. this gap represents the hyster esis about each trip point in the internal comparator. the hysteresis ensures that the gain control is monotonic and does not oscillate from one gain step to another. if a potentiometer is used to adjust the voltage on the control terminals, the gain incr eases as the potentiometer is turned in one direction and decreases as it is turned back the other direction. the trip point, where the gain actually changes, is different depending on whether the voltage is increased or decreased as a result of the hysteresis about each trip point. the gaps can also be thought of as indetermi nate states where the gain could be in the next higher gain step or the lower gain step depending on the direction the voltage is changing. if using a dac to control the volume, set the volume, set the voltage in the mi ddle of each range to ensure that the desired gain is achieved. shutdown modes the SM7516 employs a shutdown mode of operation designed to reduce supply current (i dd ) to the absolute minimum level during periods of nonuse for battery-power conservation. the shutdown input terminal should be held high during normal operation when the amplifier is in use. pulling shutdown low causes the outputs to mute and the amplifier to enter a low-current state, i dd = 20 a. shutdown should never be left unconnected because amplifier operation would be unpredictable. page 8 v.0.1 sep 12,2007
samhop microele ctronics corp. 3w stereo audio power amplifier with advanced dc volume control figure 3 figure 4 figure 5 figure 6 figure 4 total harmonic distortion + noise vs. frequency total harmonic distortion + noise vs. frequency thd + n (%) thd + n (%) vdd = 5v load = 4 ohms po= 1.5 w btl mode vdd = 5v load = 8 ohms po = 1 w btl mode total harmonic distortion + noise vs. output power total harmonic distortion + noise vs. output power 20db 6db 20db 6db frequency (hz) frequency (hz) thd + n (%) thd + n (%) vdd = 4 v load = 4 ohms gain = 20 db btl mode vdd = 5 v load = 4 ohms gain = 20 db btl mode 20khz 20 hz 1 khz 20khz 20 hz 1 khz output power (w) output power (w) figure 5 figure 6 page 9 v.0.1 sep 12,2007
samhop microele ctronics corp. 3w stereo audio power amplifier with advanced dc volume control figure 7 figure 8 total harmonic distortion + noise vs. output power thd + n (%) vdd = 5.5 v load = 4 ohms gain = 20 db btl mode 20khz 20 hz 1 khz output power (w) total harmonic distortion + noise vs. output power thd + n (%) output power (w) figure 8 20khz 20 hz 1 khz vdd = 5 v load = 8 ohms gain = 20 db btl mode closed loop response vdd = 5 v load = 8 ohms gain = 20 db po = 1w btl mode amplitude-db phase-degress gain phase frequency (hz) amplitude-db vdd = 5 v load = 8 ohms gain = 6 db po = 1w btl mode closed loop response gain phase phase-degress frequency (hz) figure 9 figure 10 page 10 v.0.1 sep 12,2007
figure 12 crosstalk vs. frequency vdd = 5 v load = 8 ohms po = 1 w gain = 20 db btl mode amplitude-db frequency (hz) left to right right to left output noise voltage (uvrms) output noise voltage vs. frequency vdd = 5 v load = 8 ohms bw = 22hz to 22khz a-weight btl mode frequency (hz) 20 db 0 db figure 11 figure 12 samhop microelectronics corp. 3w stereo audio power amplifier with advanced dc volume control page 11 v.0.1 sep 12,2007
7.62 typ 10max SM7516 12 pin hdip unit : mm package outline 3.300.20 3.00 min 2.54 typ 3.00 typ 4.06 typ 1.524 typ 0.51 min base metal k1 j j1 white plating dim min 0.219 0.219 0.460 0.460 0.339 0.289 0.560 0.510 0.0086 0.0086 0.0181 0.0181 0.0133 0.0114 0.0220 0.0201 max min max millimeters inches j j1 k k1 19.10 0.20 6.35 0.20 k samhop microelectronics corp. 3w stereo audio power amplifier wi th advanced dc volume control page 12 v.0.1 sep 12,2007

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