mosa ms6890 mono 1.1w power amplifier with shutdown rev 4 1/10 www.mosanalog.com mono 1.1w power amplifier low voltage operation features ? operation range: 2.5v ~ 6.5v ? shutdown current 0.1ua at 5v ? psrr at 217hz, 60db at 5v ? output power, thd+n=1% r l =8 ? , 1.1w at 5v, 0.4w at 3.3v, 200mw at 2.5v ? unity-gain stable ? space-saving sop8, msop8 and enhance thermal pad applications ? portable electronic devices ?pdas ? communication headsets ? cross-reference: lm4890, lm4893, ts4890 tpa751, max9716 description the ms6890 is a low distortion power amplifier that can drive 1.1w of continuous average power into a mono 8 ? bridged-tied load (btl). operation with 2.5v supply, it can drive 200mw into a mono 8 ? . the btl configuration eliminates the need for exte rnal coupling capacitors on the output in most applications. the ms6890 is unity-gain stable and can be configured by external gain-setting resistors. the ms6890 has good feature for portable equipment, thes e features include the low voltage operation, micropower consumption shutdown mode, enhance thermal pad and small package sop8, msop8, make the ms6890 ideally suited for use in portable electronic equipments. block diagram a2 - + -in gnd v dd bp shdn vo1 +in a1 - + bias control 6 1 2 3 4 8 vo2 5 7 - +
mosa ms6890 mono 1.1w power amplifier with shutdown rev 4 2/10 www.mosanalog.com pin configuration symbol pin description /shdn 1 /shutdown places the entire device in shutdown mode when held low. ttl compatible input. bp 2 bypass is the cap to the voltage divider for internal mid-supply bias. this terminal should be connected to a 0.1- f to 10- f capacitor c bp . +in 3 non-inverting input -in 4 inverting input vo1 5 btl negative output v dd 6 supply voltage gnd 7 ground vo2 8 btl positive output sop8, msop8 7 6 5 8 2 3 4 1 thermal pad vo2 gnd v dd vo1 shdn bp +in -in ordering information package part number packag ing marking transport media 8-pin sop (lead free) ms6890gtr 6890g 2.5k units tape and reel 8-pin sop (lead free) ms6890gu 6890g 100 units tube 8-pin msop (lead free) ms6890mgtr 6890g 3.5k units tape and reel 8-pin msop (lead free) ms6890mgu 6890g 80 units tube rohs compliance absolute maximum ratings symbol parameter rating unit v dd supply voltage 6.5 v v esd electrostatic handling 3500 v t stg storage temperature range -65 to 150 t a operating ambient temperature range -40 to 85 t j maximum junction temperature 150 t s soldering temperature, 10 seconds 260 r thja thermal resistance from junction to ambient in free air sop8 (enhance thermal pad) msop8 (enhance thermal pad) 50 50 /w
mosa ms6890 mono 1.1w power amplifier with shutdown rev 4 3/10 www.mosanalog.com operating ratings symbol parameter min typ max unit v dd supply voltage 2.5 5 6.5 v 5v electrical characteristics ta = 25c, v dd =5v, f=1khz, bw<30khz, unless otherwise specified. symbol parameter conditions min typ max unit i q quiescent current v in =0v, i o =0a - 2.7 - ma i shdn shutdown current v shdn =0v - 0.1 - ua v sdh shutdown input voltage high 2.0 - - v v sdl shutdown input voltage low - - 0.8 v psrr power supply rejection ratio r l =8 , c bp =1uf, f=217hz - 60 - db - -54 -50 db thd+n total harmonic distortion plus noise r l =8 , 1.1w - 0.2 0.316 % s/n signal-to-noise ratio r l =8 , 1.1w 90 103 - db po output power r l =8 , thd+n = 1% - 1.1 - w 3.3v electrical characteristics ta = 25c, v dd =3.3v, f=1khz, bw<30khz, unless otherwise specified. symbol parameter conditions min typ max unit i q quiescent current v in =0v, i o =0a - 2.4 - ma i sd shutdown current v shdn =0v - 0.1 - ua psrr power supply rejection ratio r l =8 , c bp =1uf, f=217hz - 60 - db - -54 -50 db thd+n total harmonic distortion plus noise r l =8, 0.4w 0.2 0.316 % s/n signal-to-noise ratio r l =8 , 0.4w 90 100 - db po output power r l =8 , thd+n = 1% - 0.4 - w 2.5v electrical characteristics ta = 25c, v dd =2.5v, f=1khz, bw<30khz, unless otherwise specified. symbol parameter conditions min typ max unit i q quiescent current v in =0v, i o =0a - 2.2 - ma i sd shutdown current v shdn =0v - 0.1 - ua psrr power supply rejection ratio r l =8 , c bp =1uf, f=217hz - 60 - db - -53 -50 db thd+n total harmonic distortion plus noise r l =8 , 0.2w - 0.22 0.316 % s/n signal-to-noise ratio r l =8 , 0.2w 90 98 - db po output power r l =8 , thd+n = 1% - 0.2 - w
mosa ms6890 mono 1.1w power amplifier with shutdown rev 4 4/10 www.mosanalog.com typical performance characteristics ta = 25c, bw<30khz, unless otherwise specified. thd+n (%) frequency (hz) thd+n (%) frequency (hz) thd+n (%) frequency (hz) thd+n vs. frequency thd+n vs. frequency thd+n vs. frequency v dd =3.3v r l =8 ? thd+n (%) output power (w) thd+n (%) output power (w) thd+n (%) output power (w) thd+n vs. output power thd+n vs. output power thd+n vs. output power psrr (db) frequency (hz) psrr (db) frequency (hz) psrr (db) frequency (hz) psrr vs. frequency psrr vs. frequency psrr vs. frequency v dd =5v r l =8 ? v dd =2.5v r l =8 ? po=0.4w po=1.1w po=0.2w f=1khz v dd =2.5v r l =8 ? f=20hz f=20khz f=1khz v dd =3.3v r l =8 ? f=20hz f=20khz f=20khz f=1khz f=20hz v dd =5v r l =8 ? c bp =1uf c bp =1uf v dd =5v r l =8 ? v dd =3.3v r l =8 ? c bp =1uf v dd =2.5v r l =8 ?
mosa ms6890 mono 1.1w power amplifier with shutdown rev 4 5/10 www.mosanalog.com quiescent current (ma) supply voltage (v) quiescent current vs. supply voltage v in =0v no load
mosa ms6890 mono 1.1w power amplifier with shutdown rev 4 6/10 www.mosanalog.com application information basic application example a2 - + -in gnd v dd bp vo1 +in a1 - + bias control 6 1 2 3 4 8 vo2 5 7 0.39uf 20k v dd v in r i 1uf shdn mcu 1uf 20k r f r l 8 - + fig.1 a audio amplifier application circuit. external gain-setting as s hown in fig.1, the amplifier a1 is independent amplifiers with an externally configured gain of a v = - r f /r i. the amplifier a2 is a closed-loop gain of a v = -1 fixed by two internal resistors. the outputs of a1 and a2 are used to drive the mono bridged-tied load (btl). high pass filter the i nput capacitor c in and resister r in are decided the cut-off frequency of the hpf. the equation is as follows: f cut-off = 1 / (2 *r in *c in ) thermal pad considerations the t hermal pad must be connected to ground. the package with thermal pad of the ms6890 requires special attention on thermal design. the thermal pad on the bottom of the ms 6890 should be soldered down to a copper pad on the circuit board. heat can be conducted away from the thermal pad through the copper plane to ambient. if the copper plane is not on the top surface of the circu it board, 9 vias of 13 mil or smaller in diameter should be used to thermally couple the thermal pad to the bottom plane. for good thermal conduction, the vias must be plated through and solder filled.
mosa ms6890 mono 1.1w power amplifier with shutdown rev 4 7/10 www.mosanalog.com external dimensions sop8 (thermal pad) h e d a a1 e b c l w2 w1 dimension in mm dimension in inch symbol min max min max a 1.35 1.75 0.0532 0.0688 a1 0.10 0.25 0.0040 0.0098 b 0.33 0.51 0.013 0.020 c 0.19 0.25 0.0075 0.0098 d 4.80 5.00 0.1890 0.1968 h 5.80 6.20 0.2284 0.2440 e 3.80 4.00 0.1497 0.1574 e 1.27 bsc 0.050 bsc l 0.40 1.27 0.016 0.050 w1 2.159 2.413 0.085 0.095 w2 msop8 (thermal pad) a a1 b c l d h e a2 e w1 w2 thermal pad 2.159 2.413 0.085 0.095 dimension in mm dimension in inch symbol min max min max a 0.81 1.12 0.032 0.048 a1 0.05 0.15 0.002 0.006 a2 0.76 0.86 0.030 0.038 b 0.28 0.38 0.011 0.015 c 0.13 0.23 0.005 0.009 d 2.90 3.10 0.114 0.122 h 4.70 5.10 0.185 0.201 e 2.90 3.10 0.114 0.122 e 0.65 0.026 l 0.40 0.66 0.016 0.026 w1 1.27 1.52 0.050 0.060 w2 1.02 1.27 0.040 0.050 note : die pad exposure size is according to lead frame design.
mosa ms6890 mono 1.1w power amplifier with shutdown rev 4 8/10 www.mosanalog.com tape and reel (unit : mm) 3.0 3.6 12.0 6.9 8.0 5.5 1.75 5.4 2.0 4.0 1.5+0.1/-0.0 dia 0.5 radius typical 1.5 min 0.30 0.3r max 1.7 2.0 0.05 0.05 0.05 0.3 sop8 3.4 4.2 12.0 5.2 8.0 5.5 1.75 3.3 2.0 4.0 1.5+0.1/-0.0 0.3 typical 1.5 min 0.30 0.3r max 1.2 1.6 0.05 0.05 0.05 0.3 msop8
mosa ms6890 mono 1.1w power amplifier with shutdown rev 4 9/10 www.mosanalog.com demo board 2 1 4 3 function description label 1: supply voltage supply voltage range is 2.5v to 6.5v, the left of ju mp is positive and the right of jump is negative. label 2: signal input connected to audio signals. label 3: speaker output connected to speaker with 8ohm or 4 ohm label 4: shutdown control the system is active mode when the jump is placed le ft, the shutdown pin of ms6890 is connect ed to gnd. the system enters shutdown mode when the jump is placed right, the shutdown pin of ms6890 is connected to v dd .
mosa ms6890 mono 1.1w power amplifier with shutdown rev 4 10/10 www.mosanalog.com circuit r6 20k r5 20k + c2 1u + c7 0.39u + c4 1u 1 2 jp1 avdd ls1 speaker c1 0.1u 1 2 jp3 -in r3 100k sd 1 bp 2 +in 3 -in 4 vo1 5 vdd 6 gnd 7 vo2 8 u1 ms6890 1 2 3 j1 sd l2 +in_j
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