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general description the MAX9703/max9704 mono/stereo class d audio power amplifiers provide class ab amplifier performance with class d efficiency, conserving board space and eliminating the need for a bulky heatsink. using a class d architecture, these devices deliver up to 15w while offering up to 78% efficiency. proprietary and patent-pro- tected modulation and switching schemes render the tra- ditional class d output filter unnecessary. the MAX9703/max9704 offer two modulation schemes: a fixed-frequency mode (ffm), and a spread-spectrum mode (ssm) that reduces emi-radiated emissions due to the modulation frequency. the device utilizes a fully differential architecture, a full bridged output, and com- prehensive click-and-pop suppression. the MAX9703/max9704 feature high 80db psrr, low 0.07% thd+n, and snr in excess of 100db. short-cir- cuit and thermal-overload protection prevent the devices from being damaged during a fault condition. the MAX9703 is available in a 32-pin tqfn (5mm x 5mm x 0.8mm) package. the max9704 is available in a 32-pin tqfn (7mm x 7mm x 0.8mm) package. both devices are specified over the extended -40? to +85? temperature range. applications features ? filterless class d amplifier ? unique spread-spectrum mode offers 5db emissions improvement over conventional methods ? up to 78% efficient ? 15w output power into 8 ? ? up to 20w peak power ? low 0.07% thd+n ? high psrr (80db at 1khz) ? 10v to 25v single-supply operation ? differential inputs minimize common-mode noise ? pin-selectable gain reduces component count ? industry-leading click-and-pop suppression ? low quiescent current (24ma) ? low-power shutdown mode (0.2?) ? short-circuit and thermal-overload protection ? available in thermally efficient, space-saving packages 32-pin tqfn (5mm x 5mm x 0.8mm)?ax9703 32-pin tqfn (7mm x 7mm x 0.8mm)?ax9704 MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers ________________________________________________________________ maxim integrated products 1 19-3160; rev 3; 1/05 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information part temp range pin-package amp MAX9703 etj -40 o c to +85 o c 32 tqfn-ep* mono max9704 etj -40 o c to +85 o c 32 tqfn-ep* stereo * ep = exposed paddle. lcd tvs lcd monitors desktop pcs lcd projectors hands-free car phone adaptors automotive pin configurations appear at end of data sheet. max9704 0.47 f inl+ outl+ outl- inl- 0.47 f h-bridge 0.47 f inr+ outr+ outr- inr- 0.47 f h-bridge MAX9703 0.47 f in+ out+ out- in- 0.47 f h-bridge block diagrams
MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (all voltages referenced to gnd.) v dd to pgnd, agnd .............................................................30v outr_, outl_, c1n..................................-0.3v to (v dd + 0.3v) c1p............................................(v dd - 0.3v) to (chold + 0.3v) chold ........................................................(v dd - 0.3v) to +40v all other pins to gnd.............................................-0.3v to +12v duration of outr_/outl_ short circuit to gnd, v dd ..................................................10s continuous input current (v dd , pgnd) ...............................1.6a continuous input current......................................................0.8a continuous input current (all other pins).......................... 20ma continuous power dissipation (t a = +70?) MAX9703 32-pin tqfn (derate 21.3mw/? above +70?)..........................................................1702.1mw max9704 32-pin tqfn (derate 33.3mw/? above +70?)..........................................................2666.7mw junction temperature ......................................................+150? operating temperature range ...........................-40? to +85? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? electrical characteristics (v dd = 15v, gnd = pgnd = 0v, shdn v ih , a v = 16db, c ss = c in = c reg = 0.47?, c1 = 100nf, c2 = 1?, fs1 = fs2 = gnd (f s = 660khz), r l connected between outl+ and outl- and outr+ and outr-, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (notes 1, 2) parameter symbol conditions min typ max units general supply voltage range v dd inferred from psrr test 10 25 v MAX9703 14 22 quiescent current i dd r l = open max9704 24 34 ma shutdown current i shdn 0.2 1.5 ? c ss = 470nf 100 turn-on time t on c ss = 180nf 50 ms amplifier output resistance in shutdown shdn = gnd 150 330 k ? a v = 13db 35 58 80 a v = 16db 30 48 65 a v = 19.1db 23 39 55 input impedance r in a v = 29.6db 10 15 22 k ? g1 = l, g2 = l 29.4 29.6 29.8 g1 = l, g2 = h 18.9 19.1 19.3 g1 = h, g2 = l 12.8 13 13.2 voltage gain a v g1 = h, g2 = h 15.9 16 16.3 db gain matching between channels (max9704) 0.5 % output offset voltage v os 6 30 mv common-mode rejection ratio cmrr f in = 1khz, input referred 60 db v dd = 10v to 25v 54 80 f ripple = 1khz 80 power-supply rejection ratio (note 3) psrr 200mv p-p ripple f ripple = 20khz 66 db r l = 4 ? 7.5 output power p out th d + n = 10%, f = 1kh z, t a = + 25 c r l = 8 ? , v dd = 20v 20 w
MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers _______________________________________________________________________________________ 3 electrical characteristics (continued) (v dd = 15v, gnd = pgnd = 0v, shdn v ih , a v = 16db, c ss = c in = c reg = 0.47?, c1 = 100nf, c2 = 1?, fs1 = fs2 = gnd (f s = 660khz), r l connected between outl+ and outl- and outr+ and outr-, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (notes 1, 2) parameter symbol conditions min typ max units total harmonic distortion plus noise thd+n f in = 1khz, either ffm or ssm, r l = 8 ? , p out = 4w 0.07 % ffm 94 bw = 22hz to 22khz ssm 88 ffm 97 signal-to-noise ratio snr r l = 8 ? , p out = 10w, f = 1khz a-weighted ssm 91 db crosstalk left to right, right to left, 8 ? load, f in = 10khz 65 db fs1 = l, fs2 = l 560 670 800 fs1 = l, fs2 = h 940 fs1 = h, fs2 = l 470 oscillator frequency f osc fs1 = h, fs2 = h (spread-spectrum mode) 670 ?% khz efficiency p out = 15w, f = 1khz, r l = 8 ? 78 % regulator output v reg 6v digital inputs ( shdn , fs_, g_) (note 4) v ih 2.5 input thresholds v il 0.8 v input leakage current 1a note 1: all devices are 100% production tested at +25?. all temperature limits are guaranteed by design. note 2: testing performed with a resistive load in series with an inductor to simulate an actual speaker load. for r l = 8 ? , l = 68?. for r l = 4 ? , l = 33?. note 3: psrr is specified with the amplifier inputs connected to gnd through c in . note 4: do not apply more than 8v to any logic pin.
MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers 4 _______________________________________________________________________________________ total harmonic distortion plus noise vs. frequency MAX9703/04 toc01 frequency (hz) thd+n (%) 10k 1k 100 0.1 1 10 0.01 10 100k v dd = 15v r l = 4 ? a v = 16db p out = 4w p out = 500mw total harmonic distortion plus noise vs. frequency MAX9703/04 toc02 frequency (hz) thd+n (%) 10k 1k 100 0.1 1 10 0.01 10 100k v dd = 15v r l = 8 ? a v = 16db p out = 500mw p out = 8w total harmonic distortion plus noise vs. frequency MAX9703/04 toc03 frequency (hz) thd+n (%) 10k 1k 100 0.1 1 10 0.01 10 100k v dd = 20v r l = 8 ? a v = 16db p out = 8w p out = 500mw total harmonic distortion plus noise vs. frequency MAX9703/04 toc04 frequency (hz) thd+n (%) 10k 1k 100 0.1 1 10 0.01 10 100k v dd = 20v r l = 8 ? a v = 16db p out = 8w ssm ffm total harmonic distortion plus noise vs. output power MAX9703/04 toc07 output power (w) thd+n (%) 4 2 6810 12 14 16 18 0.1 1 10 100 0.01 020 v dd = 20v r l = 8 ? a v = 16db f = 100hz f = 1khz f = 10khz total harmonic distortion plus noise vs. output power MAX9703/04 toc05 output power (w) thd+n (%) 6 45 2 3 1 0.1 1 10 100 0.01 010 9 78 v dd = 15v r l = 4 ? a v = 16db f = 10khz f = 1khz f = 100hz total harmonic distortion plus noise vs. output power MAX9703/04 toc06 output power (w) thd+n (%) 1 2 345678 9 10 11 12 13 14 0.1 1 10 0.01 015 v dd = 15v r l = 8 ? a v = 16db f = 100hz f = 1khz f = 10khz total harmonic distortion plus noise vs. output power MAX9703/04 toc08 output power (w) thd+n (%) 12 3 4 5678 9 10 11 12 13 14 15 16 17 18 19 0.1 1 10 0.01 020 ffm (335khz) ssm v dd = 20v r l = 8 ? a v = 16db f = 1khz efficiency vs. output power MAX9703/04 toc09 output power (w) efficiency (%) 8 6 4 23 5 7 9 1 10 20 30 40 50 60 70 80 90 100 0 010 v dd = 12v a v = 16db f = 1khz r l = 4 ? r l = 8 ? t ypical operating characteristics (33? with 4 ? , 68? with 8 ? , part in ssm mode, 136? with 16 ? , measurement bw = 22hz to 22khz, unless otherwise noted.)
MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers _______________________________________________________________________________________ 5 efficiency vs. output power MAX9703/04 toc10 output power (w) efficiency (%) 16 12 8 4 2 6 10 14 18 10 20 30 40 50 60 70 80 90 100 0 020 v dd = 15v a v = 16db f = 1khz r l = 16 ? r l = 8 ? output power vs. supply voltage MAX9703/04 toc11 supply voltage (v) output power (w) 0 6 4 2 8 10 12 14 16 18 20 10 16 13 19 22 25 r l = 8 ? r l = 16 ? a v = 16db thd+n = 10% 20 18 16 14 12 10 8 6 4 2 0 110 100 output power vs. load resistance MAX9703/04 toc12 load resistance ( ? ) output power (w) thd+n = 1% thd+n = 10% v dd = 15v r l = 8 ? a v = 16db 24 22 20 18 16 14 12 10 8 6 4 2 0 110 100 output power vs. load resistance MAX9703/04 toc13 load resistance ( ? ) output power (w) v dd = 20v r l = 8 ? a v = 16db thd+n = 10% thd+n = 1% crosstalk vs. frequency MAX9703/04 toc16 frequency (hz) crosstalk (db) 10k 1k 100 -80 -100 -60 -40 -20 0 -120 10 100k left to right right to left a v = 16db 1% thd+n v dd = 15v 8 ? load common-mode rejection ratio vs. frequency MAX9703/04 toc14 frequency (hz) cmrr (db) 10k 1k 100 -70 -60 -50 -40 -30 -20 -10 0 -80 10 100k v dd = 15v r l = 8 ? a v = 16db power-supply rejection ratio vs. frequency MAX9703/04 toc15 frequency (hz) psrr (db) 10k 1k 100 -100 -80 -60 -40 -20 0 -120 10 100k a v = 16db r l = 8 ? 200mv p-p input v dd = 15v output frequency spectrum MAX9703/04 toc17 frequency (khz) output magnitude (db) -120 -100 -80 -60 -40 -20 0 20 -140 18 16 12 14 4 6 8 10 2 020 ffm mode a v = 16db unweighted f in = 1khz p out = 5w r l = 8 ? output frequency spectrum MAX9703/04 toc18 frequency (khz) output magnitude (db) -120 -100 -80 -60 -40 -20 0 20 -140 18 16 12 14 4 6 8 10 2 020 ssm mode a v = 16db unweighted f in = 1khz p out = 5w r l = 8 ? t ypical operating characteristics (continued) (33? with 4 ? , 68? with 8 ? , part in ssm mode, 136? with 16 ? , measurement bw = 22hz to 22khz, unless otherwise noted.)
MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers 6 _______________________________________________________________________________________ output frequency spectrum MAX9703/04 toc19 frequency (khz) output magnitude (db) -120 -100 -80 -60 -40 -20 0 20 -140 18 16 12 14 4 6 8 10 2 020 ssm mode a v = 16db a-weighted f in = 1khz p out = 5w r l = 8 ? 100k 1m 10m 100m wideband output spectrum (ffm mode) MAX9703/04 toc20 frequency (hz) output amplitude (dbv) 0 -120 -100 -80 -60 -40 -20 rbw = 10khz v dd = 15v 100k 1m 10m 100m wideband output spectrum (ssm mode) MAX9703/04 toc21 frequency (hz) output amplitude (dbv) 0 -120 -100 -80 -60 -40 -20 rbw = 10khz v dd = 15v turn-on/turn-off response MAX9703/04 toc22 20ms/div output 1v/div 5v/div shdn f = 1khz r l = 8 ? c ss = 180pf supply current vs. supply voltage MAX9703/04 toc23 supply voltage (v) supply current (ma) 22 19 16 13 10 5 15 20 25 30 35 0 10 25 shutdown supply current vs. supply voltage max97703/04 toc24 supply voltage (v) supply current ( a) 18 16 14 12 0.10 0.05 0.15 0.20 0.25 0.30 0.35 0 10 20 t ypical operating characteristics (continued) (33? with 4 ? , 68? with 8 ? , part in ssm mode, 136? with 16 ? , measurement bw = 22hz to 22khz, unless otherwise noted.)
MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers _______________________________________________________________________________________ 7 pin MAX9703 max9704 name function 1, 2, 23, 24 1, 2, 23, 24 pgnd power ground 3, 4, 21, 22 3, 4, 21, 22 v dd power-supply input 55 c1n charge-pump flying capacitor negative terminal 66 c1p charge-pump flying capacitor positive terminal 77 chold charge-pump hold capacitor. connect a 1? capacitor from chold to v dd . 8, 17, 20, 25, 26, 31, 32 8 n.c. no connection. not internally connected. 91 4 reg internal regulator output. bypass with a 0.47? capacitor to pgnd. 10 13 agnd analog ground 11 in- negative input 12 in+ positive input 13 12 ss soft-start. connect a 0.47? capacitor from ss to gnd to enable soft-start feature. 14 11 shdn active-low shutdown. connect shdn to gnd to disable the device. connect to v dd for normal operation. 15 17 g1 gain-select input 1 16 18 g2 gain-select input 2 18 19 fs1 frequency-select input 1 19 20 fs2 frequency-select input 2 27, 28 out- negative audio output 29, 30 out+ positive audio output ? inl- left-channel negative input ? 0 inl+ left-channel positive input ? 5 inr- right-channel negative input ? 6 inr+ right-channel positive input 25, 26 outr- right-channel negative audio output 27, 28 outr+ right-channel positive audio output 29, 30 outl- left-channel negative audio output 31, 32 outl+ left-channel positive audio output ep exposed paddle. connect to gnd. pin description
MAX9703/max9704 detailed description the MAX9703/max9704 filterless, class d audio power amplifiers feature several improvements to switch- mode amplifier technology. the MAX9703 is a mono amplifier, the max9704 is a stereo amplifier. these devices offer class ab performance with class d effi- ciency, while occupying minimal board space. a unique filterless modulation scheme and spread-spec- trum switching mode create a compact, flexible, low- noise, efficient audio power amplifier. the differential input architecture reduces common-mode noise pick- up, and can be used without input-coupling capacitors. the devices can also be configured as a single-ended input amplifier. comparators monitor the device inputs and compare the complementary input voltages to the triangle wave- form. the comparators trip when the input magnitude of the triangle exceeds their corresponding input voltage. operating modes fixed-frequency modulation (ffm) mode the MAX9703/max9704 feature three ffm modes with different switching frequencies ( table 1). in ffm mode, the frequency spectrum of the class d output consists of the fundamental switching frequency and its associ- ated harmonics (see the wideband fft graph in the typical operating characteristics ). the MAX9703/ max9704 allow the switching frequency to be changed by 35%, should the frequency of one or more of the harmonics fall in a sensitive band. this can be done at any time and does not affect audio reproduction. spread-spectrum modulation (ssm) mode the MAX9703/max9704 feature a unique, patented spread-spectrum mode that flattens the wideband spectral components, improving emi emissions that may be radiated by the speaker and cables. this mode is enabled by setting fs1 = fs2 = h. in ssm mode, the switching frequency varies randomly by ?% around the center frequency (670khz). the modulation scheme remains the same, but the period of the triangle wave- form changes from cycle to cycle. instead of a large amount of spectral energy present at multiples of the switching frequency, the energy is now spread over a bandwidth that increases with frequency. above a few megahertz, the wideband spectrum looks like white noise for emi purposes. efficiency efficiency of a class d amplifier is attributed to the region of operation of the output stage transistors. in a class d amplifier, the output transistors act as current- steering switches and consume negligible additional power. any power loss associated with the class d out- put stage is mostly due to the i*r loss of the mosfet on-resistance, and quiescent current overhead. the theoretical best efficiency of a linear amplifier is 78%; however, that efficiency is only exhibited at peak output powers. under normal operating levels (typical music reproduction levels), efficiency falls below 30%, whereas the max9704 still exhibits >78% efficiency under the same conditions (figure 2). 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers 8 _______________________________________________________________________________________ table 1. operating modes fs1 fs2 switching mode (khz) ll 670 lh 940 hl 470 hh 670 7% figure 1. max9704 outputs with no input signal applied v in = 0v out- out+
shutdown the MAX9703/max9704 have a shutdown mode that reduces power consumption and extends battery life. driving shdn low places the device in low-power (0.2?) shutdown mode. connect shdn to a logic high for normal operation. click-and-pop suppression the MAX9703/max9704 feature comprehensive click- and-pop suppression that eliminates audible transients on startup and shutdown. while in shutdown, the h- bridge is pulled to gnd through 330k ? . during startup, or power-up, the input amplifiers are muted and an inter- nal loop sets the modulator bias voltages to the correct levels, preventing clicks and pops when the h-bridge is subsequently enabled. following startup, a soft-start function gradually unmutes the input amplifiers. the value of the soft-start capacitor has an impact on the click/pop levels. for optimum performance, c ss should be at least 180nf with a voltage rating of at least 7v. mute function the MAX9703/ma9704 features a clickless/popless mute mode. when the device is muted, the outputs stop switching, muting the speaker. mute only affects the output stage and does not shut down the device. to mute the MAX9703/max9704, drive ss to gnd by using a mosfet pulldown ( figure 3). driving ss to gnd during the power-up/down or shutdown/turn-on cycle optimizes click-and-pop suppression. applications information filterless operation traditional class d amplifiers require an output filter to recover the audio signal from the amplifier? pwm out- put. the filters add cost, increase the solution size of the amplifier, and can decrease efficiency. the tradi- tional pwm scheme uses large differential output swings (2 ? v dd peak-to-peak) and causes large ripple currents. any parasitic resistance in the filter compo- nents results in a loss of power, lowering the efficiency. the MAX9703/max9704 do not require an output filter. the devices rely on the inherent inductance of the speaker coil and the natural filtering of both the speak- er and the human ear to recover the audio component of the square-wave output. eliminating the output filter results in a smaller, less-costly, more-efficient solution. because the frequency of the MAX9703/max9704 out- put is well beyond the bandwidth of most speakers, voice coil movement due to the square-wave frequency is very small. although this movement is small, a speak- er not designed to handle the additional power can be damaged. for optimum results, use a speaker with a series inductance > 30?. typical 8 ? speakers exhibit series inductances in the range of 30? to 100?. optimum efficiency is achieved with speaker induc- tances > 60?. gain selection table 2 shows the suggested gain settings to attain a maximum output power from a given peak input voltage and given load. output offset unlike a class ab amplifier, the output offset voltage of class d amplifiers does not noticeably increase quies- cent current draw when a load is applied. this is due to the power conversion of the class d amplifier. for example, an 8mvdc offset across an 8 ? load results in 1ma extra current consumption in a class ab device. in the class d case, an 8mv offset into 8 ? equates MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers _______________________________________________________________________________________ 9 figure 2. max9704 efficiency vs. class ab efficiency 0 30 20 10 40 50 60 70 80 90 100 0 6 8 10 12 14 16 18 24 20 efficiency vs. output power output power (w) efficiency (%) v dd = 15v f = 1khz r l = 8 ? max9704 class ab MAX9703/ max9704 ss 0.18 f gpio mute signal figure 3. MAX9703/max9704 mute circuit
MAX9703/max9704 to an additional power drain of 8?. due to the high efficiency of the class d amplifier, this represents an additional quiescent current draw of: 8?/(v dd /100 ? ), which is in the order of a few microamps. input amplifier differential input the MAX9703/max9704 feature a differential input struc- ture, making them compatible with many codecs, and offering improved noise immunity over a single-ended input amplifier. in devices such as pcs, noisy digital sig- nals can be picked up by the amplifier? input traces. the signals appear at the amplifiers?inputs as common- mode noise. a differential input amplifier amplifies the difference of the two inputs, any signal common to both inputs is canceled. single-ended input the MAX9703/max9704 can be configured as single- ended input amplifiers by capacitively coupling either input to gnd and driving the other input ( figure 4). component selection input filter an input capacitor, c in , in conjunction with the input impedance of the MAX9703/max9704, forms a high- pass filter that removes the dc bias from an incoming signal. the ac-coupling capacitor allows the amplifier to bias the signal to an optimum dc level. assuming zero-source impedance, the -3db point of the highpass filter is given by: choose c in so f -3db is well below the lowest frequency of interest. setting f -3db too high affects the low-fre- quency response of the amplifier. use capacitors with dielectrics that have low-voltage coefficients, such as tantalum or aluminum electrolytic. capacitors with high- voltage coefficients, such as ceramics, may result in increased distortion at low frequencies. charge-pump capacitor selection use capacitors with an esr less than 100m ? for opti- mum performance. low-esr ceramic capacitors mini- mize the output resistance of the charge pump. for best performance over the extended temperature range, select capacitors with an x7r dielectric. flying capacitor (c1) the value of the flying capacitor (c1) affects the load regulation and output resistance of the charge pump. a c1 value that is too small degrades the device? ability to provide sufficient current drive. increasing the value of c1 improves load regulation and reduces the charge- pump output resistance to an extent. above 1?, the on- resistance of the switches and the esr of c1 and c2 dominate. hold capacitor (c2) the output capacitor value and esr directly affect the rip- ple at chold. increasing c2 reduces output ripple. likewise, decreasing the esr of c2 reduces both ripple and output resistance. lower capacitance values can be used in systems with low maximum output power levels. output filter the MAX9703/max9704 do not require an output filter and can pass fcc emissions standards with unshield- ed speaker cables. however, output filtering can be used if a design is failing radiated emissions due to board layout or cable length, or the circuit is near emi- sensitive devices. use a ferrite bead filter when radiat- ed frequencies above 10mhz are of concern. use an lc filter when radiated frequencies below 10mhz are of concern, or when long leads connect the amplifier to the speaker. refer to the max9704 evaluation kit schematic for details of this filter. f rc - 3db in in 1 2 = 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers 10 ______________________________________________________________________________________ MAX9703/ max9704 in+ in- 0.47 f 0.47 f single-ended audio input figure 4. single-ended input table 2. gain settings gain ( db ) input diff (v rms ) r l ( ? ) p out at 10% thd+n ( w ) 13.0 0.67 4 9 16.0 0.48 4 9 19.1 0.33 4 9 29.6 0.10 4 9 13.0 1.23 8 15 16.0 0.86 8 15 19.1 0.61 8 15 29.6 0.19 8 15
sharing input sources in certain systems, a single audio source can be shared by multiple devices (speaker and headphone ampli- fiers). when sharing inputs, it is common to mute the unused device, rather than completely shutting it down, preventing the unused device inputs from distorting the input signal. mute the MAX9703/max9704 by driving ss low through an open-drain output or mosfet (see the system diagram ). driving ss low turns off the class d output stage, but does not affect the input bias levels of the MAX9703/max9704. be aware that during normal operation, the voltage at ss can be up to 7v, depending on the MAX9703/max9704 supply. supply bypassing/layout proper power-supply bypassing ensures low distortion operation. for optimum performance, bypass v dd to pgnd with a 0.1? capacitor as close to each v dd pin as possible. a low-impedance, high-current power-sup- ply connection to v dd is assumed. additional bulk capacitance should be added as required depending on the application and power-supply characteristics. agnd and pgnd should be star connected to system ground. refer to the max9704 evaluation kit for layout guidance. MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers ______________________________________________________________________________________ 11
MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers 12 ______________________________________________________________________________________ MAX9703 0.47 f logic inputs shown for a v = 16db (ssm). v in = logic high > 2.5v. in+ 11 12 18 14 15 16 13 10 agnd 9 6 5 19 in- fs1 v reg v reg v reg v reg fs2 g1 g2 ss reg v reg 0.47 f modulator oscillator charge pump c1p c1 0.1 f 25v c1n 0.18 f 10v v ih gain control shutdown control 0.47 f 10v shdn h-bridge out+ out+ out- out- 30 29 28 27 pgnd v dd v dd pgnd 134212 22324 2 10v to 25v 100 f 25v 0.1 f 25v 0.1 f 25v c2 1 f 25v chold v dd 7 functional diagrams
MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers ______________________________________________________________________________________ 13 max9704 0.47 f logic inputs shown for a v = 16db (ssm). v in = logic high > 2.5v. inl+ 10 9 19 11 17 18 12 13 agnd 14 6 5 20 inl- fs1 v reg v reg v reg v reg fs2 g1 g2 ss reg 0.47 f modulator oscillator charge pump c1p c1 0.1 f 25v c1n 0.18 f 10v v ih gain control shutdown control 0.47 f 10v shdn h-bridge outl+ outl+ outl- outl- 32 31 30 29 pgnd v dd v dd pgnd 134212 22324 2 10v to 25v 100 f 25v 0.1 f 25v 0.1 f 25v c2 1 f 25v chold v dd 7 0.47 f inr+ 15 16 inr- 0.47 f modulator h-bridge outr+ outr+ outr- outr- 28 27 26 25 v reg functional diagrams (continued)
MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers 14 ______________________________________________________________________________________ max9704 max9722b 0.47 f v dd inl- v dd outl- shdn outl+ inl+ codec inr+ outr+ outr- 0.18 f 5v v dd outl outr pv ss sv ss inl+ inl- inr+ inr- c1p 1 f 1 f cin 100k ? inr- 0.47 f 0.47 f 0.47 f 1 f ss shdn logic inputs shown for a v = 16db (ssm). 1 f 1 f 30k ? 30k ? 15k ? 15k ? 1 f 1 f 1 f 100 f system diagram
MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers ______________________________________________________________________________________ 15 32 31 30 29 28 27 26 n.c. n.c. out+ out+ out- out- n.c. 25 n.c. 9 10 11 12 13 14 15 reg agnd in- in+ ss g1 16 g2 17 18 19 20 21 22 23 n.c. fs1 fs2 n.c. v dd v dd pgnd 8 7 6 5 4 3 2 n.c. chold c1p c1n v dd v dd pgnd MAX9703 1 pgnd 24 pgnd top view tqfn (5mm x 5mm) shdn 32 31 30 29 28 27 26 outl+ outl+ outl- outl- outr+ outr+ outr- 25 outr- 9 10 11 12 13 14 15 inl- inl+ ss agnd inr- reg 16 inr+ 17 18 19 20 21 22 23 g1 g2 fs1 fs2 v dd v dd pgnd 8 7 6 5 4 3 2 n.c. chold c1p c1n v dd v dd pgnd max9704 1 pgnd 24 pgnd tqfn (7mm x 7mm) shdn pin configurations chip information MAX9703 transistor count: 3093 max9704 transistor count: 4630 process: bicmos
MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers 16 ______________________________________________________________________________________ 32, 44, 48l qfn .eps proprietary information approval title: document control no. 21-0144 package outline 32, 44, 48, 56l thin qfn, 7x7x0.8mm 1 d rev. 2 e l e l a1 a a2 e/2 e d/2 d detail a d2/2 d2 b l k e2/2 e2 (ne-1) x e (nd-1) x e e c l c l c l c l k dallas semiconductor detail b e l l1 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .)
MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers ______________________________________________________________________________________ 17 proprietary information document control no. approval title: rev. 2 2 21-0144 dallas semiconductor package outline 32, 44, 48, 56l thin qfn, 7x7x0.8mm d package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .)
MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers 18 ______________________________________________________________________________________ qfn thin.eps d2 (nd-1) x e e d c pin # 1 i.d. (ne-1) x e e/2 e 0.08 c 0.10 c a a1 a3 detail a e2/2 e2 0.10 m c a b pin # 1 i.d. b 0.35x45 d/2 d2/2 l c l c e e l c c l k l l detail b l l1 e xxxxx marking g 1 2 21-0140 package outline, 16, 20, 28, 32l thin qfn, 5x5x0.8mm -drawing not to scale- l package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .)
MAX9703/max9704 15w, filterless, spread-spectrum, mono/stereo, class d amplifiers maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 19 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. common dimensions 3.35 3.15 t2855-1 3.25 3.35 3.15 3.25 max. 3.20 exposed pad variations 3.00 t2055-2 3.10 d2 nom. min. 3.20 3.00 3.10 min. e2 nom. max. ne nd pkg. codes 1. dimensioning & tolerancing conform to asme y14.5m-1994. 2. all dimensions are in millimeters. angles are in degrees. 3. n is the total number of terminals. 4. the terminal #1 identifier and terminal numbering convention shall conform to jesd 95-1 spp-012. details of terminal #1 identifier are optional, but must be located within the zone indicated. the terminal #1 identifier may be either a mold or marked feature. 5. dimension b applies to metallized terminal and is measured between 0.25 mm and 0.30 mm from terminal tip. 6. nd and ne refer to the number of terminals on each d and e side respectively. 7. depopulation is possible in a symmetrical fashion. 8. coplanarity applies to the exposed heat sink slug as well as the terminals. 9. drawing conforms to jedec mo220, except exposed pad dimension for t2855-1, t2855-3 and t2855-6. notes: symbol pkg. n l1 e e d b a3 a a1 k 10. warpage shall not exceed 0.10 mm. jedec t1655-1 3.20 3.00 3.10 3.00 3.10 3.20 0.70 0.80 0.75 4.90 4.90 0.25 0.25 0 -- 4 whhb 4 16 0.35 0.30 5.10 5.10 5.00 0.80 bsc. 5.00 0.05 0.20 ref. 0.02 min. max. nom. 16l 5x5 3.10 t3255-2 3.00 3.20 3.00 3.10 3.20 2.70 t2855-2 2.60 2.60 2.80 2.70 2.80 l 0.30 0.50 0.40 -- - -- - whhc 20 5 5 5.00 5.00 0.30 0.55 0.65 bsc. 0.45 0.25 4.90 4.90 0.25 0.65 - - 5.10 5.10 0.35 20l 5x5 0.20 ref. 0.75 0.02 nom. 0 0.70 min. 0.05 0.80 max. -- - whhd-1 28 7 7 5.00 5.00 0.25 0.55 0.50 bsc. 0.45 0.25 4.90 4.90 0.20 0.65 - - 5.10 5.10 0.30 28l 5x5 0.20 ref. 0.75 0.02 nom. 0 0.70 min. 0.05 0.80 max. -- - whhd-2 32 8 8 5.00 5.00 0.40 0.50 bsc. 0.30 0.25 4.90 4.90 0.50 - - 5.10 5.10 32l 5x5 0.20 ref. 0.75 0.02 nom. 0 0.70 min. 0.05 0.80 max. 0.20 0.25 0.30 down bonds allowed no yes 3.10 3.00 3.20 3.10 3.00 3.20 t2055-3 3.10 3.00 3.20 3.10 3.00 3.20 t2055-4 t2855-3 3.15 3.25 3.35 3.15 3.25 3.35 t2855-6 3.15 3.25 3.35 3.15 3.25 3.35 t2855-4 2.60 2.70 2.80 2.60 2.70 2.80 t2855-5 2.60 2.70 2.80 2.60 2.70 2.80 t2855-7 2.60 2.70 2.80 2.60 2.70 2.80 3.20 3.00 3.10 t3255-3 3.20 3.00 3.10 3.20 3.00 3.10 t3255-4 3.20 3.00 3.10 no no no no no no no no yes yes yes yes 3.20 3.00 t1655-2 3.10 3.00 3.10 3.20 yes no 3.20 3.10 3.00 3.10 t1655n-1 3.00 3.20 3.35 3.15 t2055-5 3.25 3.15 3.25 3.35 y 3.35 3.15 t2855n-1 3.25 3.15 3.25 3.35 n 3.35 3.15 t2855-8 3.25 3.15 3.25 3.35 y 3.20 3.10 t3255n-1 3.00 no 3.20 3.10 3.00 l 0.40 0.40 ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** see common dimensions table 0.15 11. marking is for package orientation reference only. g 2 2 21-0140 package outline, 16, 20, 28, 32l thin qfn, 5x5x0.8mm -drawing not to scale- 12. number of leads shown are for reference only. package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .)

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