View MAX97220AV2_4677931.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1 general description the max97220_ is a differential input directdrive ? line driver/headphone amplifier. this device is capable of driving line level loads with 3v rms into 1k i with a 5v supply and 2v rms into 600 i loads from a 3.3v supply. a headphone load is capable of being driven with 125mw into 32 i with a 5v supply. the ic is offered with an inter - nally fixed 6db gain or an externally set gain through external resistors. the external gain setting nodes can also be used to configure filters for set-top box applica - tions. the ic has exceptional thd+n over the full audio bandwidth. two versions of the ic are available with different turn- on times (t on ). the a, c, and e versions for headphone applications feature a t on of 5.5ms while the b and d versions, intended for set-top-box applications, feature a 130ms t on . an on-chip charge pump inverts the power- supply input, creating a negative rail. the output stage of the amplifier is powered between the positive input sup - ply and the output of the charge pump. the bipolar sup - plies bias the output about ground, eliminating the need for large, distortion-introducing output coupling capaci - tors. the ic powers on and off without clicks or pops. the ic is available in a 3mm x 3mm x 0.8mm, 16-pin tqfn and is specified over the extended -40 n c to +85 n c temperature range. applications simple multimedia interfaces set-top boxes blu-ray k and dvd players lcd televisions prosumer audio devices features s output power 125mw into 32 i with a 5v supply s 3v rms output drive into 1k i with a 5v supply s 2v rms output drive into 600 i with a 3.3v supply s fully differential inputs s fixed or externally adjustable gain with no clicks or pops s wide 2.5v to 5.5v operating range s directdrive outputs eliminate dc-blocking capacitors s flat thd+n, better than 90db in the audio band s 18-bit snr performance, 112db s footprint compatible with the max9722 19-5611; rev 2; 7/12 note: all devices operate over the -40 n c to +85 n c temperature range. + denotes a lead(pb)-free/rohs-compliant package. * ep = exposed pad. ordering information directdrive is a registered trademark of maxim integrated products, inc. blu-ray is a trademark of the blu-ray disc association. simplified block diagrams functional diagrams appear at end of data sheet. evaluation kit available left audio input right audio input r in r f r f inl- outl outr inl+ inr+ r f r f r f inr- r in r in r in max97220a/b/e left audio input right audio input r in outl sgnd sgnd outr r f r f r f r in r in r in max97220c/d inl- inl+ inr+ inr- part pin- package top mark gain set turn-on time (ms) max97220a ete+ 16 tqfn-ep* +aif external 5.5 max97220b ete+ 16 tqfn-ep* +aig external 130 max97220c ete+ 16 tqfn-ep* +aih +6db 5.5 max97220d ete+ 16 tqfn-ep* +aii +6db 130 max97220e ete+ 16 tqfn-ep* +aii +6db 5.5 max97220aCmax97220e differential input directdrive line drivers/headphone amplifiers for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com.
max97220aCmax97220e 2 stresses beyond those listed under absolute 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 pgnd.) svdd, svdd2, and pvdd ...................................... -0.3v to +6v pvss and bias ....................................................... -6v to +0.3v sgnd ................................................................... -0.3v to +0.3v inl-, inl+, inr-, and inr+ (a, b, and e) ... -v svdd /2 to +v svdd /2 inl-, inl+, inr-, and inr+ (c and d) ....... (-0.75 x v svdd ) to (+0.75 x v svdd ) outl and outr .................................................. -4.5v to +4.5v shdn ....................................................................... -0.3v to +6v c1p ........................................................ -0.3v to (v pvdd + 0.3v) c1n ....................................................... (v pvss - 0.3v) to +0.3v out_ short circuit to pgnd ..................................... continuous out_ short circuit to pvdd ...................................... continuous short circuit between outl and outr ................... continuous continuous current into/out of all pins ............................. 20ma continuous power dissipation (t a = +70 n c) (multilayer board) tqfn (derate 20.8mw/ n c above +70 n c) ............... 1666.7mw junction temperature ..................................................... +150 n c operating temperature range .......................... -40 n c to +85 n c storage temperature range ............................ -65 n c to +150 n c lead temperature (soldering, 10s) ................................ +300 n c soldering temperature (reflow) ...................................... +260 n c electrical characteristics (v pvdd = v svdd = v svdd2 = 5v, v pgnd = v sgnd = 0v, c bias = 0.1f, c1 = c2 = 1f, r in = 20k, r f = 20k (max97220a/ max97220b/max97220e), typical values tested at t a = +25 c, unless otherwise noted.) (notes 2 and 3) absolute maximum ratings note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four- layer board. for detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial . tqfn junction-to-ambient thermal resistance ( q ja ) .......... 48c/w junction-to-case thermal resistance ( q jc ) ................. 7c/w package thermal characteristics (note 1) parameter symbol conditions min typ max units general supply voltage range pvdd, svdd_ guaranteed by psrr test 2.5 5.5 v quiescent supply current i pvdd no load, t a = +25 n c a version 5.5 7 ma no load, t a = +25 n c b/c/d/e versions 5 9 no load, v pvdd = v svdd_ = 3.3v 5 undervoltage lockout uvlo pvdd falling 2.35 v shutdown supply current i pvdd_sd shdn = 0, t a = +25 n c 1 10 f a turn-on time t on shutdown to full operation time a/c/e versions 4.8 5.5 6.3 ms b/d versions 117 130 143 amplifiers input resistance r in c/d versions only 7.4 10 12.7 k i output signal attenuation in shutdown v shdn = 0v, r l = 10k w a/b/e versions 76 db c/d versions 71 gain a v c/d versions only 5.5 6 6.5 db output offset voltage v os unity gain, t a = +25 n c 350 f v input common-mode voltage range v cm voltage at in+ and in- a/b/e versions -0.5 x v pvdd +0.5 x v pvdd v c/d versions -0.75 x v pvdd +0.75 x v pvdd maximum differential input signal v diff (note 4) pvdd v p differential input directdrive line drivers/headphone amplifiers
3 electrical characteristics (continued) (v pvdd = v svdd = v svdd2 = 5v, v pgnd = v sgnd = 0v, c bias = 0.1f, c1 = c2 = 1f, r in = 20k, r f = 20k (max97220a/ max97220b/max97220e), typical values tested at t a = +25 c, unless otherwise noted.) (notes 2 and 3) parameter symbol conditions min typ max units power-supply rejection ratio psrr v pvdd = v svdd_ = 2.5v to 5.5v a/b/e versions 74 90 db v pvdd = v svdd_ = 2.5v to 5.5v c/d versions 73 90 f in = 217hz, 200mv p-p ripple 78 f in = 10khz, 200mv p-p ripple 63 common-mode rejection ratio cmrr -v pvdd /2 p v cm p +v pvdd /2 a/b/e versions 70 86 db -0.75 x v pvdd p v cm p +0.75 x v pvdd c/d versions 45 60 output voltage swing v out 1khz, 600 i load, thd+n < 0.1% 3 v rms 1khz, r l = 600 i load, v pvdd = v svdd_ = 3.3v, thd+n < 0.1% 2.15 1khz, r l = 10k i load, thd+n < 0.1% 3.5 output power p out r l = 16 i , thd+n = 1% 40 110 mw r l = 32 i , thd+n = 1% 125 total harmonic distortion plus noise thd+n 1khz, 22hz to 22khz bw, v out = 3v rms , r l = 10k i 103 db 10khz, 22hz to 22khz bw, v out = 3v rms , r l = 10k i 90 1khz, 22hz to 22khz bw, v out = 2v rms , r l = 600 i 80 105 10khz, 22hz to 30khz bw, v out = 2v rms , r l = 600 i 94 1khz, 22hz to 22khz bw, p out = 20mw, r l = 32 i 0.0035 % signal-to-noise ratio snr a/b/e versions v out = 3v rms , thd+n = 0.1%, a-weighted, r in = r f = 10k i , r l = 1k i 112.5 db v out = 2v rms , v pvdd = 3.3v, thd+n = 0.1%, a-weighted, r in = r f = 10k i , r l = 600 i 109 c/d versions v out = 3v rms , thd+n = 0.1%, a-weighted, r l = 1k i 106 v out = 2v rms , v pvdd = 3.3v, thd+n = 0.1%, a-weighted, r l = 600 i 103 max97220aCmax97220e differential input directdrive line drivers/headphone amplifiers
max97220aCmax97220e 4 electrical characteristics (continued) (v pvdd = v svdd = v svdd2 = 5v, v pgnd = v sgnd = 0v, c bias = 0.1f, c1 = c2 = 1f, r in = 20k, r f = 20k (max97220a/ max97220b/max97220e), typical values tested at t a = +25 c, unless otherwise noted.) (notes 2 and 3) parameter symbol conditions min typ max units output noise voltage vn a/b/e versions a-weighted, r in = r f = 10k i 7 f v c/d versions a-weighted 14 crosstalk x talk a/b/e versions 1khz, v out = 3v rms , r l = 10k i -125 db 10khz, v out = 3v rms , r l = 10k i -108 1khz, v out = 2v rms , r l = 600 i , v pvdd = v svdd_ = 3.3v -123 10khz, v out = 2v rms , r l = 600 i , v pvdd = v svdd_ = 3.3v -104 1khz, p out = 20mw, r l = 32 i -102 10khz, p out = 20mw, r l = 32 i -82 c/d versions 1khz, v out = 2v rms , r l = 10k i 100 10khz, v out = 2v rms , r l = 10k i 98 1khz, v out = 2v rms , r l = 600 i 100 10khz, v out = 2v rms , r l = 600 i 96 1khz, p out = 20mw, r l = 32 i 95 1khz, p out = 20mw, r l = 16 i 92 maximum capacitive load drive c l 470 pf external feedback resistor range r f a/b/e versions 4.7 20 100 k i oscillator frequency f osc 450 500 550 khz differential input directdrive line drivers/headphone amplifiers
5 note 2 : 100% production tested at t a = +25 n c. specifications over temperature limits are guaranteed by design. note 3: dynamic specifications are taken over 2.5v to 5.5v supply range. inputs ac-coupled to pgnd. note 4: the maximum differential input signal does not cause any excess distortion due to violation of the common-mode input range. note 5: test performed with a resistive load connected to pgnd. mode transitions are controlled by shdn . kcp level is calcu - lated as 20 x log (peak voltage during mode transition, no input signal). typical operating characteristics (v pvdd = v svdd = v svdd2 = 5v, v pgnd = v sgnd = 0v, c bias = 0.1f, c1 = c2 = 1f, r in = 10k, r f = 10k, unless otherwise noted.) electrical characteristics (continued) (v pvdd = v svdd = v svdd2 = 5v, v pgnd = v sgnd = 0v, c bias = 0.1f, c1 = c2 = 1f, r in = 20k, r f = 20k (max97220a/ max97220b/max97220e), typical values tested at t a = +25 c, unless otherwise noted.) (notes 2 and 3) total harmonic distortion plus noise vs. frequency max97220 toc01 frequency (khz) thd+n (db) 10 1 0.1 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -120 0.01 100 v pvdd = 3.3v r l = 600i bw = 22hz to 22khz v out = 1v rms v out = 2v rms total harmonic distortion plus noise vs. frequency max97220 toc02 frequency (khz) thd+n (db) 10 1 0.1 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -120 0.01 100 v pvdd = 5v r l = 10ki bw = 22hz to 22khz v out = 1v rms v out = 3v rms total harmonic distortion plus noise vs. frequency max97220 toc03 frequency (khz) thd+n (%) 10 1 0.1 0.001 0.01 0.1 1 10 100 0.0001 0.01 100 v pvdd = 3.3v r l = 32i p out = 30mw p out = 10mw parameter symbol conditions min typ max units click-and-pop level (note 5) kcp 32 samples per second, a-weighted, r l = 10k i , unity gain into shutdown -70 dbv out of shutdown -70 32 samples per second, a-weighted, r l = 32 i , unity gain into shutdown -76 out of shutdown -76 logic input ( shdn ) shdn input logic-high v ih 1.4 v shdn input logic-low v il 0.4 v shdn input leakage current high i ih t a = +25 n c 1 f a shdn input leakage current low i il t a = +25 n c 1 f a max97220aCmax97220e differential input directdrive line drivers/headphone amplifiers
max97220aCmax97220e 6 typical operating characteristics (continued) (v pvdd = v svdd = v svdd2 = 5v, v pgnd = v sgnd = 0v, c bias = 0.1f, c1 = c2 = 1f, r in = 10k, r f = 10k, unless otherwise noted.) total harmonic distortion plus noise vs. frequency max97220 toc04 frequency (khz) thd+n (%) 10 1 0.1 0.001 0.01 0.1 1 10 100 0.0001 0.01 100 v pvdd = 5v r l = 32i p out = 20mw p out = 90mw total harmonic distortion plus noise vs. frequency max97220 toc05 frequency (khz) thd+n (%) 10 1 0.1 0.001 0.01 0.1 1 10 100 0.0001 0.01 100 v pvdd = 3.3v r l = 16i p out = 10mw p out = 25mw total harmonic distortion plus noise vs. output voltage max97220 toc07 output voltage (v rms ) thd+n (db) 2.5 2.0 1.5 1.0 0.5 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -130 0 3.0 f in = 1khz f in = 10khz v pvdd = 3.3v r l = 600i total harmonic distortion plus noise vs. frequency max97220 toc06 frequency (khz) thd+n (%) 10 1 0.1 0.001 0.01 0.1 1 10 100 0.0001 0.01 100 v pvdd = 5v r l = 16i p out = 20mw p out = 80mw total harmonic distortion plus noise vs. output voltage max97220 toc08 output voltage (v rms ) thd+n (db) 4.0 3.5 2.5 3.0 1.0 1.5 2.0 0.5 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -140 0 4.5 f in = 1khz f in = 10khz v pvdd = 5v r l = 10ki total harmonic distortion plus noise vs. output power max97220 toc09 output power (mw) thd+n (%) 50 40 30 20 10 06 0 v pvdd = 3.3v r l = 32i 0.001 0.01 0.1 1 10 100 0.0001 f in = 1khz f in = 300hz total harmonic distortion plus noise vs. output power max97220 toc10 output power (mw) thd+n (%) 120 140 100 80 60 40 20 0 180 160 v pvdd = 5v r l = 32i 0.001 0.01 0.1 1 10 100 0.0001 f in = 1khz f in = 300hz total harmonic distortion plus noise vs. output power max97220 toc11 output power (mw) thd+n (%) 50 40 30 20 10 06 0 v pvdd = 3.3v r l = 16i 0.001 0.01 0.1 1 10 100 0.0001 freq = 1khz freq = 300hz total harmonic distortion plus noise vs. output power max97220 toc12 output power (mw) thd+n (%) 120 140 100 80 60 40 20 0 160 v pvdd = 5v r l = 16i 0.001 0.01 0.1 1 10 100 0.0001 freq = 1khz freq = 300hz differential input directdrive line drivers/headphone amplifiers
7 typical operating characteristics (continued) (v pvdd = v svdd = v svdd2 = 5v, v pgnd = v sgnd = 0v, c bias = 0.1f, c1 = c2 = 1f, r in = 10k, r f = 10k, unless otherwise noted.) output voltage vs. supply voltage max97220 toc13 supply voltage (v) output voltage (v rms ) 5.0 4.5 4.0 3.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 2.5 5.5 thd+n = 1% thd+n = 10% f in = 1khz r l = 600 i output voltage vs. supply voltage max97220 toc14 supply voltage (v) output voltage (v rms ) 5.0 4.5 4.0 3.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 2.5 5.5 thd+n = 1% thd+n = 10% f in = 1khz r l = 10k i output power vs. supply voltage max97220 toc15 supply voltage (v) output power (mw) 5.0 4.5 4.0 3.5 3.0 25 50 75 100 125 150 175 200 225 250 0 2.5 5.5 thd+n = 1% thd+n = 10% f in = 1khz r l = 32i output power vs. supply voltage max97220 toc16 supply voltage (v) output power (mw) 5.0 4.5 4.0 3.5 3.0 20 40 60 80 100 120 140 160 180 200 0 2.5 5.5 thd+n = 1% thd+n = 10% f in = 1khz r l = 16 i output voltage vs. load resistance max97220 toc17 load resistance (ki) output voltage (v rms ) 10 1 1.5 2.0 2.5 3.0 3.5 4.0 1.0 0.1 100 thd+n = 1% thd+n = 10% v pvdd = 3.3v f in = 1khz output voltage vs. load resistance max97220 toc18 load resistance (ki) output voltage (v rms ) 10 1 2.5 3.0 3.5 4.0 4.5 5.0 2.0 0.1 100 thd+n = 1% thd+n = 10% v pvdd = 5v f in = 1khz output power vs. load resistance max97220 toc19 load resistance (i) output power (mw) 100 10 20 30 40 50 60 70 80 90 100 0 10 1000 thd+n = 1% thd+n = 10% v pvdd = 3.3v f in = 1khz output power vs. load resistance max97220 toc20 load resistance (i) output power (mw) 100 25 50 75 100 125 150 175 200 225 250 0 10 1000 thd+n = 1% thd+n = 10% f in = 1khz power dissipation vs. output power max97220 toc21 output power (mw) power dissipation (mw) 135 120 90 105 30 45 60 75 15 20 40 60 80 100 120 140 160 180 200 0 0 150 v pvdd = 3.3v r l = 32i max97220aCmax97220e differential input directdrive line drivers/headphone amplifiers
max97220aCmax97220e 8 typical operating characteristics (continued) (v pvdd = v svdd = v svdd2 = 5v, v pgnd = v sgnd = 0v, c bias = 0.1f, c1 = c2 = 1f, r in = 10k, r f = 10k, unless otherwise noted.) power dissipation vs. output power max97220 toc22 output power (mw) power dissipation (mw) 180 160 120 140 40 60 80 100 20 40 80 120 160 200 240 280 320 360 400 0 0 200 v pvdd = 5v r l = 32 i gain flatness vs. frequency max97220 toc23 frequency (khz) gain (db) 100 10 1 0.1 -3 -2 -1 0 1 2 3 4 5 6 7 8 -4 0.01 1000 max97220c/max97220d a v = 6db max97220a/max97220b a v = 0db crosstalk vs. frequency max97220 toc24 frequency (khz) crosstalk (db) 10 1 0.1 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -140 0.01 100 v pvdd = 3.3v r l = 600i v out = 2v rms right to left left to right crosstalk vs. frequency max97220 toc25 frequency (khz) crosstalk (db) 10 1 0.1 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -140 0.01 100 r l = 10ki v out = 3v rms right to left left to right crosstalk vs. frequency max97220 toc26 frequency (khz) crosstalk (db) 10 1 0.1 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -140 0.01 100 r l = 32i p out = 20mw right to left left to right crosstalk vs. frequency max97220 toc27 frequency (khz) crosstalk (db) 10 1 0.1 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -140 0.01 100 r l = 16i p out = 20mw right to left left to right max97220 toc28 frequency (khz) crosstalk (db) 10 1 0.1 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -120 0.01 100 v pvdd = 3.3v r l = 600i v out = 2v rms left to right right to left crosstalk vs. frequency c/d versions max97220 toc29 frequency (khz) crosstalk (db) 10 1 0.1 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -120 0.01 100 r l = 10ki v out = 2v rms left to right right to left crosstalk vs. frequency c/d versions max97220 toc30 frequency (khz) crosstalk (db) 10 1 0.1 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -120 0.01 100 r l = 32i p out = 20mw left to right right to left crosstalk vs. frequency c/d versions differential input directdrive line drivers/headphone amplifiers
9 typical operating characteristics (continued) (v pvdd = v svdd = v svdd2 = 5v, v pgnd = v sgnd = 0v, c bias = 0.1f, c1 = c2 = 1f, r in = 10k, r f = 10k, unless otherwise noted.) max97220 toc31 frequency (khz) crosstalk (db) 10 1 0.1 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -120 0.01 100 r l = 16i p out = 20mw crosstalk vs. frequency c/d versions left to right right to left power-supply rejection ratio vs. frequency max97220 toc32 frequency (khz) psrr (db) 10 1 0.1 -100 -80 -60 -40 -20 0 -120 0.01 100 v pvdd = 3.3v r l = 32 i v ripple = 200mv p-p v pvdd = 5v r l = 10ki common-mode rejection ratio vs. frequency max97220 toc33 frequency (khz) cmrr (db) 10 1 0.1 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 0.01 100 v pvdd = 3.3v r l = 32i frequency (khz) cmrr (db) 10 1 0.1 0.01 100 common-mode rejection ratio vs. frequency max97220 toc34 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -120 r l = 1ki entering shutdown max97220 toc35 out_ 1v/div shdn 2v/div 40s/div exiting shutdown max97220 toc36 out_ 5v/div shdn 2v/div 20ms/div max97220b/max97220d max97220aCmax97220e differential input directdrive line drivers/headphone amplifiers
max97220aCmax97220e 10 typical operating characteristics (continued) (v pvdd = v svdd = v svdd2 = 5v, v pgnd = v sgnd = 0v, c bias = 0.1f, c1 = c2 = 1f, r in = 10k, r f = 10k, unless otherwise noted.) shutdown current vs. supply voltage max97220 toc40 supply voltage (v) shutdown current (a) 5.0 4.5 3.0 3.5 4.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 2.5 5.5 no load shutdown current vs. temperature max97220 toc41 temperature (c) shutdown current (a) 60 35 10 -15 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 -0.2 -40 85 no load v pvdd = 5v v pvdd = 3.3v rf immunity vs. frequency max97220 toc42 frequency (mhz) rf immunity (db) 2600 2100 1600 1100 600 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -130 100 3100 left channel right channel r l = 32i exiting shutdown max97220 toc37 out_ 5v/div shdn 2v/div 2ms/div max97220a/max97220c/max97220e supply current vs. supply voltage max97220 toc38 supply voltage (v) supply current (ma) 5.0 4.5 4.0 3.5 3.0 1 2 3 4 5 6 7 8 9 10 0 2.5 5.5 no load supply current vs. temperature max97220 toc39 temperature (c) supply current (ma) 60 35 10 -15 1 2 3 4 5 6 7 8 9 10 0 -40 85 no load v pvdd = 5v v pvdd = 3.3v differential input directdrive line drivers/headphone amplifiers
11 pin description pin configuration 15 16 ep 14 13 6 5 7 c1p c1n 8 pvdd bias svdd2 outl 12 inl- 4 12 11 9 inl+ shdn inr- inr+ sgnd pvss max97220 pgnd outr 3 10 svdd tqfn top view + pin name function 1 pvdd charge-pump power-supply input. bypass to pgnd with 1 f f. 2 c1p positive flying capacitor connection. connect a 1 f f capacitor between c1p and c1n. 3 pgnd power ground. connect pgnd and sgnd together at the system ground plane. 4 c1n negative flying capacitor connection. connect a 1 f f capacitor between c1p and c1n. 5 pvss negative charge-pump output. bypass to pgnd with 1 f f. 6 sgnd signal ground. connect pgnd and sgnd together at the system ground plane. 7 inr+ right positive polarity input 8 inr- right negative polarity input 9 svdd2 signal path power-supply input. bypass to pgnd with 1 f f. connect directly to pvdd. 10 outr right directdrive output 11 bias internal supply node. bypass to pgnd with 0.1 f f. 12 outl left directdrive output 13 svdd signal path power-supply input. bypass to pgnd with 1 f f. connect directly to pvdd. 14 inl- left negative polarity input 15 inl+ left positive polarity input 16 shdn active-low shutdown. drive shdn high for normal operation. ep exposed pad. electrically connect to pgnd or leave unconnected. max97220aCmax97220e differential input directdrive line drivers/headphone amplifiers
max97220aCmax97220e 12 detailed description the max97220_ is a fully differential input line driver/ headphone amplifier for set-top boxes, lcd tv, and home theater applications where audio fidelity is of pri - mary importance. power consumption of the amplifier is reduced while maintaining high snr and thd+n per - formance. the max97220a/max97220b/max97220e require external input and feedback resistors to set amplifier gain. the max97220c/max97220d feature internal input and feedback resistors for a set gain of +6db. output swings of 3v rms with a 5v supply and 2v rms with a 3.3v supply are perfect for line driver applications. high fidelity is maintained through the differential input connection. an output noise voltage of 7 f v rms allows for 112db snr when powered from 5v and 109db snr when powered from 3.3v. the ic has better than 90db thd+n across the entire audio bandwidth. the max97220_ operates from a single supply ranging from 2.5v to 5.5v. an on-chip charge pump inverts the positive supply (pvdd), creating an equal magnitude negative supply (pvss). the headphone amplifiers operate from bipolar supplies with their outputs biased about pgnd (figure 1). the benefit of this pgnd bias is that the amplifier outputs do not have a dc component, typically pvdd/2. the large dc-blocking capacitors required with conventional headphone amplifiers are unnecessary, thus conserving board space, reducing system cost, and improving frequency response. output power of 125mw into 32 i is achievable from a 5v sup - ply. the device features an undervoltage lockout that prevents operation from an insufficient power supply and click-and-pop suppression that eliminates audible transients on startup and shutdown. differential input the ic can be configured as differential or pseudo- differential input amplifiers (figures 2 and 3), making it compatible with all codecs. a differential input offers improved noise immunity over a single-ended input. in devices such as cellular phones, high-frequency signals from the rf transmitter can couple into the amplifiers input traces. the signals appear at the amplifiers inputs as common-mode noise. a differential input amplifier amplifies the difference of the two inputs while signals common to both inputs are cancelled. configured dif - ferentially, the gain of the max97220a/max97220b/ max97220e is set by: a v = r f /r in the common-mode rejection ratio (cmrr) is limited by the external resistor matching, and if used, input capaci - tor matching at low frequencies. for example, the worst- case variation of 1% tolerant resistors results in 40db cmrr, while 0.1% resistors result in 60db cmrr. for best matching, use resistor arrays. figure 1. conventional driver output waveform vs. max97220_ output waveform figure 2. differential input configuration v out pvdd pvdd/2 pgnd pgnd v out +pvdd -pvdd directdrive biasing scheme conventional driver-biasing scheme out r f1* r in1* in- in+ r in2 r in1 = r in2 , r f1 = r f2 *r in1 and r f1 are internal for max97220c/max97220d r f2 differential input directdrive line drivers/headphone amplifiers
13 directdrive conventional single-supply headphone amplifiers have their outputs biased about a nominal dc voltage (typically half the supply) for maximum dynamic range. large cou - pling capacitors are needed to block this dc bias from the headphone. without these capacitors, a significant amount of dc current flows to the headphone, resulting in unnecessary power dissipation and possible damage to both the headphone and the headphone amplifier. maxims patented directdrive architecture uses a charge pump to create an internal negative supply voltage, allowing the ic's outputs to be biased about pgnd. with no dc component, there is no need for the large dc-blocking capacitors. instead of two large (220 f f, typ) tantalum capacitors, the ic charge pump requires two small ceramic capacitors, conserving board space, reducing cost, and improving the frequency response of the headphone amplifier. input filter in addition to the cost and size disadvantages of dc-blocking capacitors required by conventional head - phone amplifiers, these capacitors limit the amplifiers low-frequency response and can distort the audio signal. if input capacitors are used, input capacitor c in , in con - junction with internal input resistor 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 signal to an optimum dc level. assuming zero- source impedance, the -3db point of the highpass filter is given by: -3db in in 1 f 2r c = setting f -3db too high affects the low-frequency response of the amplifier. use capacitors with adequately low volt - age coefficients, such as x7r ceramic capacitors with a high voltage rating. capacitors with higher voltage coef - ficients result in increased distortion at low frequencies. bias capacitor bypass bias with a 0.1 f f capacitor to pgnd. do not connect external loads to bias. charge pump the max97220_ features a low-noise charge pump. the 500khz switching frequency is well beyond the audio range and, thus, does not interfere with the audio sig - nals. the switch drivers feature a controlled switching speed that minimizes noise generated by turn-on and turn-off transients. by limiting the switching speed of the charge pump, the di/dt noise caused by the parasitic bond wire and trace inductance is minimized. the ic requires a 1 f f flying capacitor between c 1p and c 1n and a 1 f f hold capacitor from pvss to pgnd. click-and-pop suppression the ic features maxims industry-leading click-and-pop suppression circuitry. when entering shutdown, the amplifier outputs are high impedance to ground. this scheme minimizes the energy present in the audio band. shutdown the ic features a 1 f a low-power shutdown mode that reduces power consumption. when the active-low shutdown mode is entered, the devices internal bias circuitry is disabled, the amplifier outputs go high imped - ance, and bias is driven to pgnd. the max97220a/ max97220b/max97220e inputs are driven to pgnd. figure 3. pseudo-differential input configuration out audio codec r f1* r in1* in- out gnd in+ r in2 r in1 = r in2 , r f1 = r f2 *r in1 and r f1 are internal for max97220c/max97220d r f2 max97220aCmax97220e differential input directdrive line drivers/headphone amplifiers
max97220aCmax97220e 14 applications information max9722 compatibility the max97220_ is compatible with the footprint of the max9722. bias on the max97220_ is in the same posi - tion as svss. on the max9722, svss is connected to pvss. for the max97220_, there is only one charge- pump output that doubles as the amplifiers negative power-supply input. the connection of negative charge- pump output and amplifier negative power-supply input is internal on the max97220_ and external on the max9722. to implement a pcb that is compatible with both the max9722 and max97220_, put a capacitor pad from bias/svss (max97220_/max9722 pin 11) to pgnd. also, place a 0 i resistor pad from bias/svss (max97220_/max9722 pin 11) to pvss (pin 5 on both parts). install the 0 i resistor when the max9722 is used and leave the resistor out of circuit when the max97220_ is used (figure 4). power dissipation while driving a headphone load, the ic dissipates a sig - nificant amount of power. the maximum power dissipa - tion is given in the continuous power dissipation of the absolute maximum ratings section or can be calculated by the following equation: j(max) a d(max) ja tt p ? = q where t j(max) is +150 n c, t a is the ambient temperature, and b ja is the reciprocal of the derating factor in n c/w as specified in the absolute maximum ratings section. since the ic is a stereo amplifier, the total maximum internal power dissipation for a given v dd and load is given by the following equation: 2 dd d(max) 2 l 4v p r = if the internal power dissipation for a given application exceeds the maximum allowed for a given package, reduce power dissipation by decreasing supply voltage, ambient temperature, input signal, or gain, or by increasing load impedance. the tqfn package features an exposed thermal pad on its underside. this pad lowers the package's thermal impedance by providing a direct heat conduction path from the die to the pcb. connect the exposed thermal pad to pgnd or an isolated plane. figure 4. max97220a vs. max9722 pcb layout 0.47f 0.47f 0.47f 0.47f 10ki 10ki 10ki 10ki 10ki 10ki 10ki 10ki shdn -inr +inr +inl -inl outl bias c1p charge pump c1n pvss c1 1f open 0.1f c2 1f outr sgnd pgnd pvdd svdd 1f 1f 2.5v to 5.5v max97220a 0.47f 0.47f 0.47f 0.47f 10ki 10ki 10ki 10ki 10ki 10ki 10ki 10ki shdn -inr +inr +inl -inl outl svss c1p charge pump c1n pvss c1 1f 0i 1f 1f outr sgnd pgnd pvdd svdd 1f 1f 2.5v to 5.5v max9722 differential input directdrive line drivers/headphone amplifiers
15 thermal-overload protection limits total power dissipa - tion in the ic. when the junction temperature exceeds +160 n c, the thermal protection circuitry disables the amplifier. operation returns to normal once the die cools by 15 n c. charge-pump capacitor selection use capacitors with an esr less than 100m i 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 charge pumps load regulation and output resistance. a c1 value that is too small degrades the devices ability to provide sufficient current drive, which leads to a loss of output voltage. increasing the value of c1 improves load regulation and reduces the charge-pump output resis - tance to an extent. above 1 f f, the on-resistance of the switches and the esr of c1 and c2 dominate. hold capacitor (c2) the hold capacitor value and esr directly affect the ripple at pvss. use a low-esr 1 f f capacitor for c2. amplifier gain the gain of the max97220c/max97220d is internally set at 6db where all gain-setting resistors are integrated into the device. the internally set gain, in combination with directdrive, results in a headphone amplifier that requires only tiny 1 f f capacitors to complete the ampli - fier circuit. the gain of the max97220a/max97220b/max97220e amplifier is set externally as shown in figure 5. the gain is: a v = -r f /r in choose feedback resistor values between the 4.7k i and 100k i range. supply bypassing proper power-supply bypassing ensures low-noise, low- distortion performance. connect a 1 f f ceramic capaci - tor from pvdd to pgnd and a 1 f f ceramic capacitor from svdd to pgnd. add additional bulk capacitance as required by the application. locate the bypass capacitor as close as possible to the device. pcb layout and grounding good pcb layout is essential for optimizing performance. use large traces for the power-supply inputs and ampli - fier outputs to minimize losses due to parasitic trace resistance and route heat away from the device. good grounding improves audio performance, and prevents any digital switching noise from coupling into the audio. connect pgnd and sgnd together at a single point on the pcb. connect all components associated with the charge pump (c1 and c2) to the pgnd plane. connect pvdd and svdd together at the device. place capacitors c1 and c2 as close as possible to the device. ensure the pcb layout is partisioned so that the large switching currents in the ground plane do not return through sgnd and the traces and components in the audio signal path. refer to the max97220 evaluation kit for layout guidelines. the ic is inherently designed for excellent rf immunity. for best performance, add ground fills around all signal traces on top or bottom pcb planes. also, ensure a solid ground plane is used in multilayer pcb designs. figure 5. setting the max97220a/max97220b/max97220e gain left audio input right audio input r in r f inl- outl outr inl+ inr+ r f r f r f inr- r in r in r in max97220a max97220b max97220e max97220aCmax97220e differential input directdrive line drivers/headphone amplifiers
max97220aCmax97220e 16 functional diagrams chip information process: bicmos 0.47f 0.47f 0.47f 0.47f 10ki 10ki 10ki 10ki 10ki 10ki 10ki -inr +inr +inl -inl outl bias c1p charge pump c1n pvss c1 1f c bias 0.1f c2 1f outr pvdd svdd 1f 1f 2.5v to 5.5v max97220a max97220b max97220e 0.47f 0.47f 0.47f 0.47f 10ki 20ki 20ki 10ki 20ki 20ki 10ki 10ki shdn -inr +inr +inl -inl outl bias c1p charge pump c1n pvss c1 1f c bias 0.1f c2 1f outr sgnd pgnd pvdd svdd 1f 1f 2.5v to 5.5v max97220c max97220d shdn sgnd pgnd 10ki differential input directdrive line drivers/headphone amplifiers
17 package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. package type package code outline no. land pattern no. 16 tqfn t1633-4 21-0136 90-0031 max97220aCmax97220e differential input directdrive line drivers/headphone amplifiers
max97220aCmax97220e 18 package information (continued) for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. differential input directdrive line drivers/headphone amplifiers
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated products, inc. 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 19 ? 2012 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 1/11 initial release 1 10/11 added top marks to ordering information , added b/c/d versions to quiescent supply current, output signal attenuation in shutdown, and power-supply rejection ratio in the electrical characteristics table 1, 2, 3 2 7/12 added max97220e 1C19 max97220aCmax97220e differential input directdrive line drivers/headphone amplifiers

▲Up To Search▲

Price & Availability of MAX97220AV2

	To Download MAX97220AV2 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .