mosa ms6895 mono 1.1w fully differential power amplifier rev 1 1/7 www.mosanalog.com mono 1.1w, fully differential input excellent psrr, low voltage operation features ? psrr at 217hz, 80db at 5v ? operation range: 2.5v~6.5v ? shutdown current 0.1ua 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, enhance thermal pad applications ? portable electronic devices ?pdas ? communication headsets description the ms6895 is a fully differential power amplifier that ca n 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 ms6895 is unity-gain stable and can be configured by external gain-setting resistors. the ms6895 has good feature for portable equipment, these features include the fully differential input, low voltage operation, micropower consumption shutdown mode, enhance thermal pad and small package sop8, make the ms6895 ideally suited for use in portable electronic equipments. block diagram -in bp sd vo2 +in bias vo1 v dd gnd 1 4 2 6 5 8 3 + - - + common mode 7
mosa ms6895 mono 1.1w fully differential power amplifier rev 1 2/7 www.mosanalog.com pin configuration symbol pin description /sd 1 shutdown places the entire device in shutdown mode when held low. ttl compatible input. -in 2 negative differential input +in 3 positive differential input bp 4 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 . vo1 5 negative btl output gnd 6 ground v dd 7 supply voltage vo2 8 positive btl output sop8 +in vo2 5 6 7 8 2 3 4 1 sd -in bp v dd gnd vo1 thermal pad ordering information package part number packag ing marking transport media 8-pin sop (lead free) ms6895gtr 6895g 2.5k units tape and reel 8-pin sop (lead free) ms6895gu 6895g 100 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) 50 /w
mosa ms6895 mono 1.1w fully differential power amplifier rev 1 3/7 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 - 80 - db - -60 -55 db thd+n total harmonic distortion plus noise r l =8 , 1.1w - 0.1 0.178 % 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 1.3 - 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 - 70 - db - -60 -55 db thd+n total harmonic distortion plus noise r l =8, 0.4w 0.1 0.178 % 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 0.5 - 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 - -60 -55 db thd+n total harmonic distortion plus noise r l =8 , 0.2w - 0.1 0.178 % 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 0.28 - w
mosa ms6895 mono 1.1w fully differential power amplifier rev 1 4/7 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 ? po=0.4w 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 ? po=1.1w v dd =2.5v r l =8 ? 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 v dd =5v r l =8 ? c bp =1uf c bp =1uf v dd =3.3v r l =8 ? v dd =2.5v r l =8 ?
mosa ms6895 mono 1.1w fully differential power amplifier rev 1 5/7 www.mosanalog.com quiescent current (ma) supply voltage (v) quiescent current vs. supply voltage v in =0v no load
mosa ms6895 mono 1.1w fully differential power amplifier rev 1 6/7 www.mosanalog.com application information basic application example 2 r l 8 4 3 -in bp sd + +in bias v dd gnd 1 6 5 8 + - - + common mode 7 1uf 1uf 20k r f1 v dd 20k r f2 - 0.39uf 20k r i1 mcu 0.39uf 20k + differential input r i2 vo2 vo1 - differential input fig.1 a audio amplifier application circuit. external gain-setting as s hown in fig.1, r i1 =r i2 and r f1 =r f2 , the respective closed-loop gain is set at -r f /r i. it is important to match input resistors and feedback resistors to each other. the outputs 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 ms6895 requires special attention on thermal design. the thermal pad on the bottom of the ms 6895 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 ms6895 mono 1.1w fully differential power amplifier rev 1 7/7 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 2.159 2.413 0.085 0.095 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
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