mosa ms6894 mono 1.1w fully differential power amplifier with shutdown selection rev 1 1/9 www.mosanalog.com mono 1.1w, fully differential input excellent psrr, low voltage operation selectable shutdown logic level 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 msop10, enhance thermal pad applications ? portable electronic devices ?pdas ? communication headsets ? cross-reference: lm4894 description the ms6894 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 shutdown may be enabled by either logic high or logic low that depending on shutdown mode selection. the btl configuration eliminates the need for exte rnal coupling capacitors on the output in most applications. the ms6894 is unity-gain stable and can be configured by external gain-setting resistors. the ms6894 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 msop10, make the ms6894 ideally suited for use in portable electronic equipments. block diagram sd mode -in bp sd vo2 +in bias vo1 v dd gnd 1 5 3 2 7 6 10 4 + - - + common mode 7
mosa ms6894 mono 1.1w fully differential power amplifier with shutdown selection rev 1 2/9 www.mosanalog.com pin configuration symbol pin description sd 1 shutdown places the entire device in shutdown mode depending on sd mode selection. ttl compatible input. sd mode = 0, the device entries shutdown when sd is logic low. sd mode = 1, the device entries shutdown when sd is logic high. +in 2 positive differential input sd mode 3 the shutdown mode controls the shutdown logic level of the sd pin1. ttl compatible input -in 4 negative differential input bp 5 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 6 negative btl output gnd 7 ground nc 8 no connected v dd 9 supply voltage vo2 10 positive btl output msop10 vo2 6 7 8 9 10 2 3 4 1 sd -in sd mode +in 5 bp v dd nc gnd vo1 thermal pad ordering information package part number packag ing marking transport media 10-pin msop (lead free) ms6894mgtr 6894g 3.5k units tape and reel 10-pin msop (lead free) ms6894mgu 6894g 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 msop10 (enhance thermal pad) 50 /w
mosa ms6894 mono 1.1w fully differential power amplifier with shutdown selection rev 1 3/9 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 v sdmh sd mode input voltage high 2.0 - - v v sdml sd mode 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 ms6894 mono 1.1w fully differential power amplifier with shutdown selection rev 1 4/9 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 ms6894 mono 1.1w fully differential power amplifier with shutdown selection rev 1 5/9 www.mosanalog.com quiescent current (ma) supply voltage (v) quiescent current vs. supply voltage v in =0v no load
mosa ms6894 mono 1.1w fully differential power amplifier with shutdown selection rev 1 6/9 www.mosanalog.com application information basic application example 2 r l 8 5 3 4 sd mode -in bp sd + +in bias v dd gnd 1 7 6 10 + - - + common mode 9 1uf 100k 1uf 20k r f1 v dd 20k r f2 - 0.39uf 20k r i1 mcu v dd 0.39uf 20k + differential input r i2 vo2 vo1 - differential input fig.1 a audio amplifier application circuit. shutdown control the s hutdown may be enabled by either logic high or logic low that depending on shutdown mode selection. both the sd pin and the sd mode pin are ttl compatible input. the sd mode is logic low, the device entries shutdown when sd is logic low. the sd mode is logic high, the device entries shutdown when sd is logic high. 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 ms6894 requires special attention on thermal design. the thermal pad on the bottom of the ms 6894 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 ms6894 mono 1.1w fully differential power amplifier with shutdown selection rev 1 7/9 www.mosanalog.com external dimensions msop10 (thermal pad) a a1 b c l d h e a2 thermal pad e w1 w2 dimension in mm dimension in inches symbol min nom max min nom max a 0.81 0.92 1.12 0.032 0.036 0.044 a1 0.05 - 0.15 0.002 - 0.006 a2 0.76 0.86 0. 97 0.030 0.034 0.038 b 0.15 0.20 0.30 0.006 0.008 0.012 c 0.13 0.15 0.23 0.005 0.006 0.009 d 2.90 3.00 3.10 0.114 0.118 0.122 h 4.70 4.90 5.10 0.185 0.193 0.201 e 2.90 3.00 3.10 0.114 0.118 0.122 e 0.50 basic 0.02 basic l 0.40 0.53 0.66 0.016 0.021 0.026 0 o - 6 o 0 o - 6 o w1 1.27 - 1.52 0.050 - 0.060 w2 1.02 - 1.27 0.040 - 0.050 tape and reel (unit : mm) msop10 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
mosa ms6894 mono 1.1w fully differential power amplifier with shutdown selection rev 1 8/9 www.mosanalog.com demo board 2 1 4 3 5 function description label 1: sup ply 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: shutdown mode selection (sd mode) the shutdown mode is low logic level shutdown mode when the jump is placed left position (sd), the sd mode is connected to gnd. on the other hand , the chip is high logic level shutdo wn mode when the jump is placed right position (sd), the sd mode is connected to v dd . label 3: shu tdown pin (sd pin) the shutdown may be enabled by either logic high or logic low that depending on shutdown mode selection. the sd mode is placed left position (sd), the chip entries shutdown when sd pin is placed left position (l), the sd mode is connected to gnd. on the other hand, the sd mode is placed right position (s d), the chip entrie s shutdown when sd pin is placed right position (h), the sd mode is connected to v dd . label 4: sign al input connected to audio signals. label 5: speaker output connected to speaker with 8ohm or 4 ohm.
mosa ms6894 mono 1.1w fully differential power amplifier with shutdown selection rev 1 9/9 www.mosanalog.com circuit r1 20k r2 20k + c2 1u + c4 0.39u + c3 1u 1 2 j1 avdd ls1 speaker c1 0.1u 1 2 j4 -in sd 1 in- 2 sdm 3 in+ 4 bp 5 vo1 6 gnd 7 nc 8 vdd 9 vo2 10 u1 ms6894 1 2 3 j2 sd 1 2 3 j3 sd mode r3 20k + c5 0.39u r4 20k avdd bp 1 2 j5 +in
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