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general description the max9718/max9719 differential input audio power amplifiers are ideal for portable audio devices with internal speakers. the differential input structure improves noise rejection and provides common-mode rejection. a bridge-tied load (btl) architecture mini- mizes external component count, while providing high- quality, power audio amplification. the max9718 is a single-channel amplifier while the max9719 is a dual- channel amplifier for stereo systems. both devices deliver 1.4w continuous average power per channel to a 4 ? load with less than 1% thd+n while operating from a single +5v supply. the devices are available as adjustable gain amplifiers or with internally fixed gains of 0db, 3db, and 6db to reduce component count. a shutdown input disables the bias generator and amplifiers and reduces quiescent current consumption to less than 100na. the max9718 shutdown input can be set as active high or active low. these devices fea- ture maxim? comprehensive click-and-pop suppres- sion circuitry that reduces audible clicks and pops during startup and shutdown. the max9718 is pin compatible with the lm4895, and is available in 9-bump ucsp, 10-pin tdfn, and 10-pin ?ax packages. the max9719 is available in 16-pin tqfn, 16-pin tssop, and 16-bump ucsp pack- ages. both devices operate over the -40? to +85? extended temperature range. applications mobile phones pdas portable devices features 2.7v to 5.5v single-supply operation very high -93db psrr at 217hz 1.4w into 4 ? at 1% thd+n (per channel) differential input internal fixed gain to reduce component count adjustable gain option (max9718a/max9719a) 100na low-power shutdown mode no audible clicks or pops at power-up/down improved performance pin-compatible upgrade to lm4895 (max9718d) max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers ________________________________________________________________ maxim integrated products 1 ordering information max9719 single supply 2.7v to 5.5v shdn inl+ inl- inr+ inr- max9718 single supply 2.7v to 5.5v shdm shdn in+ out+ out- outr- outr+ outl- outl+ in- simplified block diagram 19-3050; rev 1; 6/04 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 continued at end of data sheet. pin configurations appear at end of data sheet. ucsp is a trademark of maxim integrated products, inc. ?ax is a registered trademark of maxim integrated products, inc. part temp range pin- package gain (db) max9718 aebl-t -40 c to +85 c 3 x 3 ucsp adj max9718aetb -40 c to +85 c 10 tdfn-ep* adj max9718aeub -40 c to +85 c 10 max-ep* adj * ep = exposed paddle.
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics?v supply (v cc = 5v, gnd = 0, shdn/ shdn = v cc (max9718/max9719), shdm = gnd (max9718), r in = r f = 10k ? (max971_a), t a = +25 c. c bias = 0.1f, no load. typical values are at t a = +25 c, unless otherwise noted.) (note 1) 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. supply voltage (v cc to gnd) ..................................-0.3v to +6v any other pin to gnd ...............................-0.3v to (v cc + 0.3v) in_, bias, shdm, shdn, shdn continuous current ........20ma out_ short-circuit duration to gnd or v cc .............continuous continuous power dissipation (t a = +70 c) 9-bump ucsp (derate 5.2mw/ c above +70 c)..........412mw 10-pin tdfn (derate 24.4mw/ c above +70 c) ........1951mw 10-pin max (derate 10.3mw/ c above +70 c) ..........825mw 16-bump ucsp (derate 8.2mw/ c above +70 c) .......659mw 16-pin tqfn (derate 16.9mw/ c above +70 c) ........1349mw 16-pin tssop (derate 21.3mw/ c above +70 c) ......1702mw operating temperature range ...........................-40 c to +85 c junction temperature .....................................................+150 c storage temperature range .............................-65 c to +150 c bump temperature (soldering) reflow............................+235 c lead temperature (soldering, 10s) .................................+300 c parameter symbol conditions min typ max units supply voltage v cc 2.7 5.5 v supply current i cc v in- = v in+ = v bias , t a = -40 c to +85 c, per amplifier (note 2) 5.0 7.5 ma shutdown supply current i shdn shdn = shdm = shdn = gnd, per amplifier 0.1 1 a v ih 0.7 x v cc shdn , shdn, shdm threshold v il 0.3 x v cc v common-mode bias voltage v bias (note 3) v cc /2 - 5% v cc /2 v cc /2 + 5% v a v = 0db, max971_a, max971_b 1 10 a v = 3db, max971_c 1 15 output offset voltage v os v in- = v in+ = v bias a v = 6db, max971_d 1 20 mv a v = 0db, max971_b 0.5 v cc - 0.5 a v = 3db, max971_c 0.5 v cc - 0.6 inferred from cmrr test a v = 6db, max971_d 0.5 v cc - 0.8 common-mode input voltage v ic external gain, max971_a 0.5 v cc - 1.2 v input impedance r in max971_b, max971_c, max971_d 10 15 20 k ? -50 -60 common-mode rejection ratio cmrr f n = 1khz -60 db f = 217hz -93 power-supply rejection ratio psrr v in- = v in+ = v bias , v ripple = 200m v p-p , r l = 8 ? , c bias = 1f f = 1khz -90 db r l = 8 ? 0.8 1.1 output power p out thd+n = 1%, f in = 1khz (note 4) r l = 4 ? 1.4 w total harmonic distortion plus noise thd+n r l = 8 ? , f in = 1khz, p out = 0.75w, v cc = 5v, a v = 6db (note 5) 0.002 %
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers _______________________________________________________________________________________ 3 electrical characteristics 5v supply (continued) (v cc = 5v, gnd = 0, shdn/ shdn = v cc (max9718/max9719), shdm = gnd (max9718), r in = r f = 10k ? (max971_a), t a = +25 c. c bias = 0.1f, no load. typical values are at t a = +25 c, unless otherwise noted.) (note 1) electrical characteristics 3v supply (v cc = 3v, gnd = 0, shdn/ shdn = v cc (max9718/max9719), shdm = gnd (max9718), r in = r f = 10k ? (max971_a), t a = +25 c. c bias = 0.1f, no load. typical values are at t a = +25 c, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units gain accuracy max971_b/max971_c/max971_d 1 % channel-to-channel gain matching max9719b/max9719c/max9719d 1 % signal-to-noise ratio snr p out = 1w, r l = 8 ? -104 db thermal-shutdown threshold +160 c thermal-shutdown hysteresis 15 c maximum capacitive drive c load bridge-tied capacitance 500 pf power-up/enable from shutdown time t pu 10 ms shutdown time t shdn 3.5 s turn-off transient v pop (note 6) 50 mv crosstalk max9719, f in = 1khz -85 db parameter symbol conditions min typ max units supply current i cc v in- = v in+ = v bias , t a = -40 c to +85 c, per amplifier (note 2) 3.8 6.0 ma shutdown supply current i shdn shdn = shdm = shdn = gnd, per amplifier 0.1 1 a v ih 0.7 x v cc shdn , shdn, shdm threshold v il 0.3 x v cc v common-mode bias voltage v bias (note 3) v cc /2 - 5% v cc /2 v cc /2 + 5% v a v = 0db, max971_a/ max971_b 1 10 a v = 3db, max971_c 1 15 output offset voltage v os v in- = v in+ = v bias a v = 6db, max971_d 1 20 mv a v = 0db, max971_b 0.5 v cc - 0.7 a v = 3db, max971_c 0.5 v cc - 0.8 inferred from cmrr test a v = 6db, max971_d 0.5 v cc - 1.0 common-mode input voltage v ic external gain, max971_a 0.5 v cc - 1.2 v input impedance r in max971_b/max971_c/max971_d 10 15 20 k ? -50 -60 common-mode rejection ratio cmrr f n = 1khz -70 db f = 217hz -93 power-supply rejection ratio psrr v in- = v in+ = v bias , v ripple = 200m v p-p , r l = 8 ? , c bias = 1f f = 1khz -90 db
total harmonic distortion + noise vs. frequency max9718 toc01 frequency (hz) thd+n (%) 100 1k 10k 0.001 0.01 0.1 1 10 0.0001 10 100k v cc = 5v r l = 4 ? a v = 2 output power = 1w output power = 50mw total harmonic distortion + noise vs. frequency max9718 toc02 frequency (hz) thd+n (%) 100 1k 10k 0.001 0.01 0.1 1 10 0.0001 10 100k v cc = 5v r l = 4 ? a v = 4 output power = 1w output power = 200mw total harmonic distortion + noise vs. frequency max9718 toc03 frequency (hz) thd+n (%) 100 1k 10k 0.001 0.01 0.1 1 10 0.0001 10 100k v cc = 5v r l = 8 ? a v = 2 output power = 250mw output power = 750mw typical operating characteristics (v cc = 5v, c bias = 0.1f, thd+n measurement bandwidth = 22hz to 22khz, t a = +25 c, unless otherwise noted.) note 1: all specifications are 100% tested at t a = +25 c. specifications over temperature (t a = t min to t max ) are guaranteed by design, not production tested. note 2: quiescent power-supply current is specified and tested with no load. quiescent power-supply current depends on the offset voltage when a practical load is connected to the amplifier. guaranteed by design. note 3: common-mode bias voltage is the voltage on bias and is nominally v cc /2. note 4: output power is specified by a combination of a functional output current test and characterization analysis. note 5: measurement bandwidth for thd+n is 22hz to 22khz. note 6: peak voltage measured at power-on, power-off, into or out of shdn. bandwidth defined by a-weighted filters, inputs at ac gnd. v cc rise and fall times greater than or equal to 1ms. max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers 4 _______________________________________________________________________________________ electrical characteristics 3v supply (continued) (v cc = 3v, gnd = 0, shdn/ shdn = v cc (max9718/max9719), shdm = gnd (max9718), r in = r f = 10k ? (max971_a), t a = +25 c. c bias = 0.1f, no load. typical values are at t a = +25 c, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units output power p out r l = 8 ? , thd+n = 1%, f in = 1khz (note 4) 475 mw total harmonic distortion plus noise thd+n r l = 8 ? , f in = 1khz, p out = 0.25w, a v = 6db 0.003 % thermal-shutdown threshold +160 c thermal-shutdown hysteresis 15 c maximum capacitive drive c load bridge-tied capacitance 500 pf power-up/enable from shutdown time t pu 10 ms shutdown time t shdn 3s turn-off transient v pop (note 6) 40 mv crosstalk max9719, f n = 1khz -85 db
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers _______________________________________________________________________________________ 5 total harmonic distortion + noise vs. frequency max9718 toc04 frequency (hz) thd+n (%) 100 1k 10k 0.001 0.01 0.1 1 10 0.0001 10 100k v cc = 5v r l = 8 ? a v = 4 output power = 200mw output power = 800mw total harmonic distortion + noise vs. frequency max9718 toc05 frequency (hz) thd+n (%) 100 1k 10k 0.001 0.01 0.1 1 10 0.0001 10 100k v cc = 3v r l = 4 ? a v = 2 output power = 250mw output power = 50mw total harmonic distortion + noise vs. frequency max9718 toc06 frequency (hz) thd+n (%) 100 1k 10k 0.001 0.01 0.1 1 10 0.0001 10 100k v cc = 3v r l = 4 ? a v = 4 output power = 70mw output power = 175mw total harmonic distortion + noise vs. frequency max9718 toc07 frequency (hz) thd+n (%) 100 1k 10k 0.001 0.01 0.1 1 10 0.0001 10 100k v cc = 3v r l = 8 ? a v = 2 output power = 250mw output power = 100mw total harmonic distortion + noise vs. frequency max9718 toc08 frequency (hz) thd+n (%) 100 1k 10k 0.001 0.01 0.1 1 10 0.0001 10 100k v cc = 3v r l = 8 ? a v = 4 output power = 200mw output power = 50mw total harmonic distortion + noise vs. output power max9718 toc09 output power (w) thd+n (%) 0.2 0.4 0.6 0.8 1.2 1.4 1.0 1.8 0.01 0.1 1 10 100 0.001 0 2.0 f in = 1khz f in = 100hz f in = 10khz 1.6 v cc = 5v r l = 4 ? a v = 2 total harmonic distortion + noise vs. output power max9718 toc10 output power (w) thd+n (%) 0.5 1.5 1.0 0.01 0.1 1 10 100 0.001 0 2.0 f in = 1khz f in = 100hz f in = 10khz v cc = 5v r l = 4 ? a v = 4 total harmonic distortion + noise vs. output power max9718 toc11 output power (w) thd+n (%) 0.2 0.6 0.8 1.0 1.2 0.4 0.01 0.1 1 10 100 0.001 0 1.4 f in = 1khz f in = 100hz f in = 10khz v cc = 5v r l = 8 ? a v = 2 total harmonic distortion + noise vs. output power max9718 toc12 output power (w) thd+n (%) 0.2 0.6 0.8 1.0 1.2 0.4 0.01 0.1 1 10 100 0.001 0 1.4 f in = 100hz f in = 1khz f in = 10khz v cc = 5v r l = 8 ? a v = 4 typical operating characteristics (continued) (v cc = 5v, c bias = 0.1f, thd+n measurement bandwidth = 22hz to 22khz, t a = +25 c, unless otherwise noted.)
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers 6 _______________________________________________________________________________________ total harmonic distortion + noise vs. output power max9718 toc13 output power (mw) thd+n (%) 100 300 400 500 200 0.01 0.1 1 10 100 0.001 0600 f in = 10khz f in = 1khz f in = 100hz v cc = 3v r l = 4 ? a v = 2 total harmonic distortion + noise vs. output power max9718 toc14 output power (mw) thd+n (%) 100 300 400 500 200 0.01 0.1 1 10 100 0.001 0 600 f in = 1khz f in = 100hz f in = 10khz v cc = 3v r l = 4 ? a v = 4 total harmonic distortion + noise vs. output power max9718 toc15 output power (mw) thd+n (%) 100 300 400 500 200 0.01 0.1 1 10 100 0.001 0600 f in = 1khz f in = 100hz f in = 10khz v cc = 3v r l = 8 ? a v = 2 total harmonic distortion + noise vs. output power max9718 toc16 output power (mw) thd+n (%) 100 300 400 500 200 0.01 0.1 1 10 100 0.001 0 f in = 1khz f in = 100hz f in = 10khz v cc = 3v r l = 8 ? a v = 4 total harmonic distortion + noise vs. common-mode voltage max9718 toc17 common-mode voltage (v) thd+n (%) 1345 2 0.001 0.01 0.0001 0 v cc = 5v p o = 200mw a v = 2 total harmonic distortion + noise vs. common-mode voltage max9718 toc18 common-mode voltage (v) thd+n (%) 0.5 1.5 2.0 2.5 3.0 1.0 0.001 0.01 0.0001 0 v cc = 3v p o = 200mw a v = 2 output power vs. supply voltage max9718 toc19 supply voltage (v) output power 5.0 4.5 4.0 3.5 3.0 0.5 1.0 1.5 2.0 2.5 0 2.5 5.5 r l = 4 ? f = 1khz a v = 2 thd+n = 10% thd+n = 1% output power vs. supply voltage max9718 toc20 supply voltage (v) output power (w) 5.0 4.5 4.0 3.5 3.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0 2.5 5.5 r l = 8 ? f = 1khz a v = 2 thd+n = 10% thd+n = 1% output power vs. load resistance max9718 toc21 load resistance ( ? ) output power (w) 100 10 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 1 v cc = 5v f = 1khz a v = 2 thd+n = 10% thd+n = 1% typical operating characteristics (continued) (v cc = 5v, c bias = 0.1f, thd+n measurement bandwidth = 22hz to 22khz, t a = +25 c, unless otherwise noted.)
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers _______________________________________________________________________________________ 7 output power vs. load resistance max9718 toc22 load resistance ( ? ) output power (mw) 100 10 200 100 300 400 500 600 0 1 thd+n = 10% thd+n = 1% v cc = 3v f = 1khz a v = 2 power dissipation vs. output power max9718 toc23 output power (w) power dissipation (w) 1.5 1.2 0.9 0.6 0.3 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0 0 1.8 v cc = 5v r l = 4 ? f = 1khz a v = 2 power dissipation vs. output power max9718 toc24 output power (w) power dissipation (w) 1.2 1.0 0.8 0.6 0.4 0.2 0.2 0.4 0.6 0.8 1.0 0 01.4 v cc = 5v r l = 8 ? f = 1khz a v = 2 power dissipation vs. output power max9718 toc25 output power (mw) power dissipation (mw) 600 500 400 300 200 100 100 200 300 400 500 600 700 0 0700 v cc = 3v r l = 4 ? f = 1khz a v = 2 power dissipation vs. output power max9718 toc26 output power (mw) power dissipation (mw) 400 300 200 100 50 100 150 200 250 300 350 0 0 500 v cc = 3v r l = 8 ? f = 1khz a v = 2 gain and phase vs. frequency max9718 toc27 frequency (hz) gain/phase ( /db) 10k 1k 100 -120 -90 -60 -30 0 30 60 90 120 150 -150 10 100k a v = 60db power-supply rejection ratio vs. frequency max9718 toc28 frequency (hz) psrr (db) 10k 1k 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 10 100k v ripple = 200mv p-p r l = 8 ? c bias = 1 f v cc = 5v v cc = 3v common-mode rejection ratio vs. frequency max9718 toc29 frequency (hz) cmrr (db) 10k 1k 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 10 100k v ripple = 200mv p-p r l = 8 ? c bias = 1 f v cc = 5v v cc = 3v typical operating characteristics (continued) (v cc = 5v, c bias = 0.1f, thd+n measurement bandwidth = 22hz to 22khz, t a = +25 c, unless otherwise noted.)
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers 8 _______________________________________________________________________________________ typical operating characteristics (continued) (v cc = 5v, c bias = 0.1f, thd+n measurement bandwidth = 22hz to 22khz, t a = +25 c, unless otherwise noted.) crosstalk vs. frequency max9718 toc31 frequency (hz) crosstalk (db) 10k 1k 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 -110 -120 10 100k channel 2 channel 1 v cc = 3v v ripple = 200mv p-p r l = 8 ? c bias = 1 f entering shutdown max9718 toc32 100 s/div c bias = 0.1 f v cc = 3v r l = 8 ? shdn 2v/div out+ 1v/div out- 1v/div out+ - out- 200mv/div exiting shutdown max9718 toc33 4ms/div c bias = 0.1 f v cc = 3v r l = 8 ? shdn 2v/div out+ 1v/div out- 1v/div out+ - out- 200mv/div entering power-down max9718 toc34 100 s/div c bias = 0.1 f v cc = 3v r l = 8 ? shdn 1v/div out+ 1v/div out- 1v/div out+ - out- 200mv/div exiting power-down max9718 toc35 shdn 2v/div out+ 1v/div out- 1v/div 4ms/div c bias = 0.1 f v cc = 3v r l = 8 ? out+ - out- 200mv/div crosstalk vs. frequency max9718 toc30 frequency (hz) crosstalk (db) 10k 1k 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 -110 -120 10 100k channel 2 channel 1 v cc = 5v v ripple = 200mv p-p r l = 8 ? , c bias = 1 f
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers _______________________________________________________________________________________ 9 shutdown current vs. temperature max9718 toc37 temperature ( c) shutdown current ( a) 60 35 10 -15 -0.02 -0.01 0 0.01 0.02 0.03 -0.03 -40 85 v cc = 5v v cc = 3v turn-on time vs. dc bias bypass capacitor max9718 toc38 c bias ( f) turn-on time (ms) 0.80 0.60 0.20 0.40 10 20 30 40 50 60 70 80 0 0 1.00 v cc = 5v v cc = 3v to -3db of final value typical operating characteristics (continued) (v cc = 5v, c bias = 0.1f, thd+n measurement bandwidth = 22hz to 22khz, t a = +25 c, unless otherwise noted.) pin description pin max9718 max9719 tdfn/ max ucsp tqfn ucsp tssop name function 1c2 shdn shutdown input. the polarity of shdn is dependent on the state of shdm. 9b311 shdn shutdown input. active-low shutdown input. 2c1 in- inverting input 3b2 shdm shutdown-mode polarity input. shdm controls the polarity of shdn. connect shdm high for an active-high shdn input. connect shdm low for an active-low shdn input (see table 1). 4a1 in+ noninverting input 5 a2 5 b2 7 bias dc bias bypass 6a3 out- bridge amplifier negative output 7 b3 1, 6, 11 a2, c2, c4 3, 8,13 gnd ground 8 13 15 n.c. no connection. not internally connected. 9 b1 8, 14 a4, d3 16, 10 v cc power supply 10 c3 out+ bridge amplifier positive output 2 c1 4 inr+ right-channel noninverting input 3 b1 5 inl- left-channel inverting input 4 a1 6 inl+ left-channel noninverting input 7 a3 9 outl+ left-channel bridge amplifier positive output 10 b4 12 outl- left-channel bridge amplifier negative output supply current vs. temperature max9718 toc36 temperature ( c) supply current (ma) 60 35 10 -15 1 2 3 4 5 6 0 -40 85 v cc = 5v v cc = 3v
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers 10 ______________________________________________________________________________________ pin description (continued) pin max9718 max9719 tdfn/ max ucsp tqfn ucsp tssop name function 12 d4 14 outr+ right-channel bridge amplifier positive output 15 d2 1 outr- right-channel bridge amplifier negative output 16 d1 2 inr- right-channel inverting input ep ep ep ep exposed pad. connect ep to gnd. detailed description the max9718/max9719 are 1.4w btl speaker ampli- fiers. the max9718 is a mono speaker amplifier, while the max9719 is a stereo speaker amplifier. both devices feature a low-power shutdown mode, and industry-leading click-and-pop suppression. the max9718 features a two-input shutdown scheme to configure shutdown for active high or active low. these devices consist of high output-current audio amps con- figured as btl amplifiers (see the functional diagrams ). both adjustable and fixed gain (0db, 3db, 6db) versions are available. bias these devices operate from a single 2.7v to 5.5v sup- ply and feature an internally generated, common-mode bias voltage of v cc / 2 referenced to ground. bias pro- vides both click-and-pop suppression and sets the dc bias level for the audio outputs. choose the value of the bypass capacitor as described in the bias capacitor section. do not connect external loads to bias as this can affect the overall performance. shutdown mode the max9718/max9719 feature a 100na low-power shutdown mode that reduces quiescent current con- sumption. entering shutdown disables the device s bias circuitry, the amplifier outputs go high impedance, and bias is driven to gnd. the max9718 shdm input con- trols the polarity of shdn. drive shdm high for an active-high shdn input. drive shdm low for an active- low shdn input (see table 1). the max9719 features an active-low shutdown input, shdn . click-and-pop suppression the max9718/max9719 feature maxim s industry-lead- ing click-and-pop suppression circuitry. during startup, the amplifier common-mode bias voltage ramps to the dc bias point. when entering shutdown, the amplifier outputs are high impedance to 100k ? between both outputs. this scheme minimizes the energy present in the audio band. applications information btl amplifier the max9718/max9719 are designed to drive a load differentially, a configuration referred to as bridge-tied load or btl. the btl configuration (figure 1) offers advantages over the single-ended configuration, where one side of the load is connected to ground. driving the load differentially doubles the output voltage compared to a single-ended amplifier under similar conditions. substituting 2 x v out(p-p) for v out(p-p) into the following equations yields four times the output power due to doubling of the output voltage: since the differential outputs are biased at midsupply, there is no net dc voltage across the load. this elimi- nates the need for dc-blocking capacitors required for single-ended amplifiers. these capacitors can be large, expensive, consume board space, and degrade low-frequency performance. p v r out rms l = 2 v v rms out p p = ? () 22 shdm shdn operational mode 0 0 shutdown 0 1 normal operation 1 0 normal operation 1 1 shutdown table 1. shutdown mode selection (max9718 only)
power dissipation and heat sinking under normal operating conditions, the max9718/ max9719 dissipate a significant amount of power. the maximum power dissipation for each package is given in the absolute maximum ratings section under continuous power dissipation or can be calculated by the following equation: where t j(max) is +150 c, t a is the ambient tempera- ture, and ja is the reciprocal of the derating factor in c/w as specified in the absolute maximum ratings section. for example, ja of the tqfn package is +59.2 c/w. the increase in power delivered by the btl configura- tion directly results in an increase in internal power dis- sipation over the single-ended configuration. the maximum internal power dissipation for a given v cc and load is given by the following equation: if the internal power dissipation for a given application exceeds the maximum allowed for a given package, reduce power dissipation by increasing the ground plane heat-sinking capability and the size of the traces to the device (see the layout and grounding section). other methods for reducing power dissipation are to reduce v cc , increase load impedance, decrease ambi- ent temperature, reduce gain, or reduce input signal. thermal-overload protection limits total power dissipa- tion in the max9718/max9719. when the junction tem- perature exceeds +160 c, the thermal protection circuitry disables the amplifier output stage. the ampli- fiers are enabled once the junction temperature cools by 15 c. a pulsing output under continuous thermal overload results as the device heats and cools. for optimum power dissipation and heat sinking, con- nect the exposed pad found on the max, tdfn, tqfn, and tssop packages to a large ground plane. fixed differential gain the max9718b, max9718c, max9718d, max9719b, max9719c, and max9719d feature internally fixed gains (see the selector guide ). this simplifies design, decreases required footprint size, and eliminates exter- nal gain-setting resistors. resistors r1 and r2 shown in the typical operating circuit are used to achieve each fixed gain. adjustable differential gain gain-setting resistors external feedback resistors set the gain of the max9718a and max9719a. resistors r f and r in ( figure 2) set the gain of the amplifier as follows: where a v is the desired voltage gain. hence, an r in of 10k ? and an r f of 20k ? yields a gain of 2v/v, or 6db. r f can be either fixed or variable, allowing the use of a digitally controlled potentiometer to alter the gain under software control. a r r v f in = p v r d max cc l () = 2 2 2 p tt d max j max a ja () () = ? max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers ______________________________________________________________________________________ 11 +1 v out(p-p) 2 x v out(p-p) v out(p-p) -1 figure 1. bridge-tied load configuration r f r f max9718a max9719a bias generator inverting differential input noninverting differential input (optional) (optional) in+ in- out+ out- r in r in figure 2. setting the max9718a/max9719a gain
max9718/max9719 input filter the fully differential amplifier inputs can be biased at voltages other than midsupply. the common-mode feedback circuit adjusts for input bias, ensuring the outputs are still biased at midsupply. input capacitors are not required as long as the common-mode input voltage is within the specified range listed in the electrical characteristics table. if input capacitors are used, input capacitor c in , in conjunction with r in , forms a highpass filter that removes the dc bias from an incoming signal. the ac- coupling capacitor allows the amplifier to bias the sig- nal to an optimum dc level. assuming zero-source impedance, the -3db point of the highpass filter is given by: setting f -3db too high affects the low-frequency 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, can increase distortion at low frequencies. bias capacitor bias is the output of the internally generated v cc /2 bias voltage. the bias bypass capacitor, c bias , improves psrr and thd+n by reducing power supply and other noise sources at the common-mode bias node, and also generates the clickless/popless startup dc bias waveform for the speaker amplifiers. bypass bias with a 0.1f capacitor to gnd. larger values of c bias (up to 1f) improve psrr, but slow down t on /t off times. a 1f c bias capacitor slows turn-on and turn-off times by 10 and improves psrr by 20db (at 1khz). do not connect external loads to bias. supply bypassing proper power-supply bypassing ensures low-noise, low-distortion performance. connect a 1f ceramic capacitor from v cc to gnd. add additional bulk capacitance as required by the application. locate the bypass capacitor as close to the device as possible. layout and grounding good pc board layout is essential for optimizing perfor- mance. use large traces for the power-supply inputs and amplifier outputs to minimize losses due to parasitic trace resistance and route heat away from the device. good grounding improves audio performance, minimizes crosstalk between channels, and prevents any digital switching noise from coupling into the audio signal. the max9718/max9719 tdfn, tqfn, tssop, and max packages feature exposed thermal pads on their undersides. this pad lowers the thermal resistance of the package by providing a direct-heat conduction path from the die to the pc board. connect the exposed pad to the ground plane using multiple vias, if required. ucsp applications information for the latest application details on ucsp construction, dimensions, tape carrier information, pc board tech- niques, bump-pad layout, and recommended reflow temperature profile, as well as the latest information on reliability testing results, refer to the application note: ucsp? wafer-level chip-scale package available on maxim s website at www.maxim-ic.com/ucsp. f rc db in in ? = 3 1 2 low-cost, mono/stereo, 1.4w differential audio power amplifiers 12 ______________________________________________________________________________________ part mono stereo gain (db) selectable shutdown polarity max9718a adjustable max9718b 0 max9718c 3 max9718d 6 max9719a adjustable max9719b 0 max9719c 3 max9719d 6 selector guide
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers ______________________________________________________________________________________ 13 part temp range pin- package gain (db) max9718bebl-t -40 c to +85 c3 x 3 u c s p 0 max9718betb -40 c to +85 c 10 td fn - e p *0 max9718beub -40 c to +85 c 10 m ax - e p *0 max9718cebl-t -40 c to +85 c3 x 3 u c s p 3 max9718cetb -40 c to +85 c 10 td fn - e p *3 max9718ceub -40 c to +85 c 10 m ax - e p *3 max9718debl-t -40 c to +85 c3 x 3 u c s p 6 MAX9718DETB -40 c to +85 c 10 td fn - e p *6 max9718deub -40 c to +85 c 10 m ax - e p *6 max9719 aebe-t -40 c to +85 c4 x 4 u c s p adj max9719aete -40 c to +85 c 16 tq fn - e p * adj max9719aeae -40 c to +85 c 16 ts s o p - e p * adj max9719bebe-t -40 c to +85 c4 x 4 u c s p 0 max9719bete -40 c to +85 c 16 tq fn - e p *0 max9719beae -40 c to +85 c 16 ts s o p - e p *0 max9719cebe-t -40 c to +85 c4 x 4 u c s p 3 max9719cete -40 c to +85 c 16 tq fn - e p *3 max9719ceae -40 c to +85 c 16 ts s o p - e p *3 max9719debe-t -40 c to +85 c4 x 4 u c s p 6 max9719dete -40 c to +85 c 16 tq fn - e p *6 max9719deae -40 c to +85 c 16 ts s o p - e p *6 ordering information (continued) chip information max9718 transistor count: 2359 max9719 transistor count: 4447 process: bicmos ucsp marking information : * ep = exposed paddle. aaa xxx : a1 bump indicator aaa: product code xxx: lot code
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers 14 ______________________________________________________________________________________ inl+ inl- inr+ inr- in1+ in1- in2+ in2- gnd shdn outl+ outl- outr+ outr- bias 1 f 10 f max9719 v cc inl automatic headphone detection and speaker disable circuit c1p cin in+ 2.7v to 5.5v 2.7v to 5.5v v cc outr 2.7v to 5.5v sv ss 1 f max9722b max961 outl shdn pv ss sv dd pv dd inr 1 f 1 f 0.1 f 1 f 0.1 f 1 f 0.1 f 0.1 f q q 220k ? in- system diagram
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers ______________________________________________________________________________________ 15 max9718b max9718c max9718d 2.7v to 5.5v supply bias generator inverting differential input noninverting differential input bias shdm shdn (optional) c in (optional) c in in+ in- v cc gnd c bias 0.1 f 1.0 f r 2 r 2 out+ out- r 1 r f r f r 1 shutdown control max9718a 2.7v to 5.5v supply bias generator inverting differential input noninverting differential input bias shdm shdn (optional) c in (optional) c in in+ in- v cc gnd c bias 0.1 f 1.0 f out+ out- r in r in shutdown control max9718a a v = 2 f c = 1hz c in = 1 f r in = 10k ? r f = 20k ? functional diagrams
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers 16 ______________________________________________________________________________________ max9719b max9719c max9719d 2.7v to 5.5v supply bias generator inverting differential input noninverting differential input bias shdn (optional) c in (optional) c in inl+ inl- v cc gnd c bias 0.1 f 1.0 f r 2 r 2 outl+ outl- r 1 r f r f r f r f r 1 inverting differential input noninverting differential input (optional) c in (optional) c in inr+ inr- r 2 r 2 outr+ outr- r 1 r 1 shutdown control max9719a 2.7v to 5.5v supply bias generator inverting differential input noninverting differential input bias shdn (optional) c in (optional) c in inl+ inl- v cc gnd c bias 0.1 f 1.0 f outl+ outl- r in r in inverting differential input noninverting differential input (optional) c in (optional) c in inr+ inr- outr+ outr- shutdown control max9719a a v = 2 f c = 1hz c in = 1 f r in = 10k ? r f = 20k ? r in r in functional diagrams (continued)
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers ______________________________________________________________________________________ 17 1 2 3 4 5 10 9 8 7 6 out+ v cc a 123 b c shdn shdm bias out+ gnd out- in- v cc in+ n.c. gnd in+ shdm in- shdn max 3 3 ucsp top view top view (bumps on bottom) out- bias max9718 max9718 1 2 3 4 5 10 9 8 7 6 out+ v cc n.c. gnd in+ shdm in- shdn 3mm 3mm 0.8mm tdfn 4mm 4mm 0.8mm tqfn top view out- bias max9718 max9719 16 1 2 3 4 12 11 10 9 15 14 13 5678 inr- outr- v cc n.c. outr+ gnd outl- shdn inr+ inl- inl+ bias gnd outl+ v cc gnd top view top view max9719 a 1234 b c d gnd gnd bias gnd outl- outr+ shdn outl+ outr- inr+ inl- v cc v cc inl+ 4 4 ucsp top view (bumps on bottom) max9719 inr- 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 outr- v cc n.c. outr+ gnd outl- shdn v cc outl+ tssop-ep inr- gnd inl+ inr+ inl- bias gnd pin configurations
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers 18 ______________________________________________________________________________________ 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 .) i 1 1 21-0093 package outline, 3x3 ucsp
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers ______________________________________________________________________________________ 19 6, 8, &10l, dfn thin.eps l c l c pin 1 index area d e l e l a e number of leads shown are for reference only e2 detail a n f 1 2 21-0137 package outline, 6, 8, 10 & 14l, tdfn, exposed pad, 3x3x0.80 mm common dimensions symbol min. max. a 0.70 0.80 d 2.90 3.10 e 2.90 3.10 a1 0.00 0.05 l 0.20 0.40 pkg. code n d2 e2 e jedec spec b [(n/2)-1] x e package variations 0.25 min. k a2 0.20 ref. 2.300.10 1.500.10 6 t633-1 0.95 bsc mo229 / weea 1.90 ref f 2 2 21-0137 package outline, 6, 8, 10 & 14l, tdfn, exposed pad, 3x3x0.80 mm 0.400.05 1.95 ref 0.300.05 0.65 bsc 2.300.10 8 t833-1 2.00 ref 0.250.05 0.50 bsc 2.300.10 10 t1033-1 2.40 ref 0.200.03 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.10 1.500.10 mo229 / weec mo229 / weed-3 0.40 bsc - - - - 0.200.03 2.40 ref t1433-2 14 2.300.10 1.700.10 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 .)
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers 20 ______________________________________________________________________________________ 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 .) 10l umax, exppads.eps
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers ______________________________________________________________________________________ 21 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 .) 16l,ucsp.eps h 1 1 21-0101 package outline, 4x4 ucsp
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power amplifiers 22 ______________________________________________________________________________________ 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 .) 24l qfn thin.eps c 1 2 21-0139 package outline 12, 16, 20, 24l thin qfn, 4x4x0.8mm c 2 2 21-0139 package outline 12, 16, 20, 24l thin qfn, 4x4x0.8mm
max9718/max9719 low-cost, mono/stereo, 1.4w differential audio power 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 ____________________ 23 ? 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. 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 .) tssop 4.4mm body.eps d 1 1 21-0108 package outline, tssop, 4.40 mm body exposed pad

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