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MD3203N filterless 3w class-d stereo audio amplifier tel:+86-0755-27595155 27595165 fax:+86-0755-27594792 adress:: room 613,no b xingxinyuan business building, baomin 2nd road,bao'an zone,shenzhen city,china web:http:// www.chipsourcetek.com MD3203N class-d stereo audio amplifier datasheet version 2.1 shenzhen chipsourcetek technology co. ,ltd. tel: +86-0755-27595155 2759 5165 fax: +86-0755-27594792 room 613,no b xingxinyuan business building,baomin 2nd road,bao'an zone,shenzhen city,china for detailed product information, please contact wyj_use@163.com tony.wang@chipsourcetek.com
MD3203N filterless 3w class-d stereo audio amplifier key features ? 3w output at 10% thd with a 4 ? load and 5v power supply ? filterless,low quiescent current and low emi ? high efficiency up to 90% ? superior low noise ? short circuit protection ? thermal shutdown ? mute on/off ? few external components to save space and cost ? sop-16 packages available ? pb-free package applications ? lcd monitors / tv projectors ? notebook computers ? portable speakers ? walkie takie ? handsfree phones/speaker phones ? cellular phones general description the MD3203N is a 3w class-d audio amplifier. its low thd+n feature offers high-qua lity sound reproduction. the new filterless architecture allows the device to drive speaker directly instead of using low-pa ss output filters,therefore save system cost and pcb area. with the same number of external components,the efficiency of the MD3203N is much better than that of class-ab cousins . it can optimize battery life thus is ideal for portable applications. common application tel:+86-0755-27595155 27595165 fax:+86-0755-27594792 adress:: room 613,no b xingxinyuan business building, baomin 2nd road,bao'an zone,shenzhen city,china web:http:// www.chipsourcetek.com
MD3203N filterless 3w class-d stereo audio amplifier mute on/off application tel:+86-0755-27595155 27595165 fax:+86-0755-27594792 adress:: room 613,no b xingxinyuan business building, baomin 2nd road,bao'an zone,shenzhen city,china web:http:// www.chipsourcetek.com
MD3203N filterless 3w class-d stereo audio amplifier block diagram pin configuration & marking information tel:+86-0755-27595155 27595165 fax:+86-0755-27594792 adress:: room 613,no b xingxinyuan business building, baomin 2nd road,bao'an zone,shenzhen city,china web:http:// www.chipsourcetek.com
MD3203N filterless 3w class-d stereo audio amplifier pin descriptions MD3203N sop16 pin numbe pin name description 1 + out_l left channel positive output 2 pgnd power gnd 3 -out_l left channel negative output 4 pvdd power vdd 5 /mute when bumo is nc,mute control input; when bumo is connect to gnd, mute on/off mode 6 vdd analog vdd 7 inl left channel input 8 vref internal analog reference, connect a bypass capacitor from vref to gnd 9 bumo mute on/off mode(active when it nc) 10 inr right channel input 11 gnd analog gnd 12 /shdn shutdown control input(active low),pull-down 13 pvdd power vdd 14 -out_r right channel negative output 15 pgnd power gnd 16 +out_r right channel positive output tel:+86-0755-27595155 27595165 fax:+86-0755-27594792 adress:: room 613,no b xingxinyuan business building, baomin 2nd road,bao'an zone,shenzhen city,china web:http:// www.chipsourcetek.com
MD3203N filterless 3w class-d stereo audio amplifier absolute maximum ratings these are stress ratings only and functional operation is not implied. exposure to absolute maximum ratings periods may affect device reliability. all voltages are with respect to ground. for prolonged time symbol parameter test conditions min typ max unit v in supply power 2.5 5.5 v v dd=5.0v 3.2 v dd=3.6v 1.6 thd+n=10%,f=1khz, r=4 ? v dd=3.0v 1.3 w v dd=5.0v 2.5 v dd=3.6v 1.3 thd+n=1%,f=1khz, r =4 ? v dd=3.0v 0.85 w v dd=5.0v 1.8 v dd=3.6v 0.9 thd+n=10%,f=1khz,r=8 ? v dd=3.0v 0.6 w v dd=5.0v 1.4 v dd=3.6v 0.72 po output power thd+n=1%,f=1khz,r=8 ? v dd=3.0v 0.45 w v dd =5.0v,po=0.5w,r =8 ? 0.15 v dd =3.6v,po=0.5w,r =8 ? f=1khz 0.11 % v dd =5.0v,po=1w,r =4 ? 0.15 thd+n total harmonic distortion plus noise v dd =3.6v,po=1w,r =4 ? f=1khz 0.11 % gv gain 24 db tel:+86-0755-27595155 27595165 fax:+86-0755-27594792 adress:: room 613,no b xingxinyuan business building, baomin 2nd road,bao'an zone,shenzhen city,china web:http:// www.chipsourcetek.com
MD3203N filterless 3w class-d stereo audio amplifier f=100hz -59 psrr psrr power supply ripple rejection v dd =5v,inputs ac-grounded with c in =0.47 f f=1khz -58 db cs crosstalk v dd =3.6v,po=1w,r =4 ? f=1khz -95 db snr signal-to-noiseratio v dd =5v, vorms=1v,gv=20db f=1khz 80 db a-weighting 100 vn outputnoise v dd =5v,inputs ac-grounded with c in =0.47 f noa-weighting 150 v dyn dynamicrange v dd =5.0v,thd=1% f=1khz 90 db r l =8 ? ,thd=10% 87 efficiency r l =4 ? ,thd=10% f=1khz 83 % v dd =5.0v 16 v dd =3.6v 10 i q quiescent current v dd =3.0v noload 8 ma tel:+86-0755-27595155 27595165 fax:+86-0755-27594792 adress:: room 613,no b xingxinyuan business building, baomin 2nd road,bao'an zone,shenzhen city,china web:http:// www.chipsourcetek.com
MD3203N filterless 3w class-d stereo audio amplifier tel:+86-0755-27595155 27595165 fax:+86-0755-27594792 adress:: room 613,no b xingxinyuan business building, baomin 2nd road,bao'an zone,shenzhen city,china web:http:// www.chipsourcetek.com
MD3203N filterless 3w class-d stereo audio amplifier tel:+86-0755-27595155 27595165 fax:+86-0755-27594792 adress:: room 613,no b xingxinyuan business building, baomin 2nd road,bao'an zone,shenzhen city,china web:http:// www.chipsourcetek.com application notes 1. when then MD3203N works with lc filters, it should be connected with the speaker before it?s powered on,otherwise it will be damaged easily. 2. when the MD3203N works without lc filters, it?s better to add a ferrite chip bead at the outgoing line of speaker for suppressing the possible elec tromagnetic interference. 3. the recommended operating voltage is 5.5v . when the MD3203N is powered with 4 batte ry cells, it should be noted that the voltage of 4 new dry or alkaline batteries is over 6.0v, higher than its operation voltage, which will device. therefore, it?s recommened to use either 4 ni-mh(nickel metal hydride)rechargeable batteries or 3 dry or alkaline batteries. 4. one should not make the inpu t signal too large. large signal can cause the clipping of output signal when increasing the volume. this will damage the devi ce because of big gain of the MD3203N 5. when testing the MD3203N without lc filters by using resistor instead of speaker as the output load, the test results, e.g. thd or efficiency, will be worse than those of using speaker as load.
MD3203N filterless 3w class-d stereo audio amplifier test setup for performance testing notes 1. the ap aux-0025 low pass filter is necessary for class-d amplifier measurement with ap analyzer. 2. two 22h inductors are used in series with load resistor to emulate the small speaker for efficiency measurement. application information maximum gain as shown in block diagram(page 2),the MD3203N has two internal amplifier stages.the first stages gain is externally configurable,while the second stages is internally fixed. the closed-loop gain of the first stage is set by selecting the ratio of r f to r i while the second stages gain is fixed at 2x. the output of amplifier 1 serves as the input to amplifier 2, thus the two amplifiers produce signals identical in magnitude,but different in phase by 180o.consequentl,the differential gain for the ic is a vd =20*log[2*( r f /r i )] the md3203 sets maximum r f =142k ,minimum r i =18k ,so the maximum closed-gain is 24db. mute operation the mute pin is an input for controlling the output state of the MD3203N.when the bumo is connect to gnd,a logic low on this pin disables the outputs,and a logic high on this pin enables the outputs,this pin may be used as quick disable or enable of theoutputs without a volume fade . when the bumo is nc ,into mute on/off mode.quiescent current is listed in the electrical characteristic table.te mute pin can be left floating due to the internal pull-up. shutdown operation in order to reduce power consumption while not in use,the MD3203N contains shutdown circuitry to turn off the amplifiers bias circuitry. this shutdown applied to the shdn pin,by switching the shdn pin connected to gnd,the MD3203N supply current draw will be minimized in idle mode,the shdn pin can be left tel:+86- 595155 27595165 fax:+86-0755-27594792 adress:: room 613,no b xingxinyuan business building, baomin 2nd road,bao'an zone,shenzhen city,china web:http:// www.chipsourcetek.com 0755-27
MD3203N filterless 3w class-d stereo audio amplifier tel:+86-0755-27595155 27595165 fax:+86-0755-27594792 adress:: room 613,no b xingxinyuan business building, baomin 2nd road,bao'an zone,shenzhen city,china web:http:// www.chipsourcetek.com feature turns the amplifier off when logic low is floating due to the internal pull-up. power supply decoupling the MD3203N is a high performance cmos audio amplifier that requires adequate power supply decoupling to ensure the output thd and psrr as low as possible . power supply decoupling affects low as possible . power supply decoupling affects low frequency response. optimum decoupling is achieved by using two capacitors of different types targeting to different types of noise on the power supply leads. for higher frequency transients,spikes,or digital has on the line,a good low equivalent-series-resistance(esr)ceramic capacitor, typically 1.0 f ,works best, placing it as close as possible to the device v dd terminal.for filtering lower-frequency noise signals,a large capacitor of 20 f (ceramic) or greater is recommended,placing it near the audio power amplifier. input capacitor (c i ) large input capacitors are both expensive and space hungry for portable designs. clearly,acertain sized capacitor is needed to couple in low frequencies without severe attenuation.but in many cases the speakers used inportable systems,whether internal or external,have little ability to reproduce signals below 100hz to 150hz,thus,using a large input capacitor may not increase actual system performance .in this case,input capacitor( c i )and input resistance ( r i ) of the amplifier form a high-pass filter with the corner frequency determined by equation below, f c =1/2 tt r i c i in addition to system cost and size,click and pop performance is affected by the size of the input coupling capacitor c i .a larger input coupling capacitor requires more charge to reach its quiescent dc voltage(nominall 1/2 v dd ). this charge comes from the internal circuit via the feedback and is apt to create pops upon device enable.thus,by minimizing the capacitor size based on necessary low frequency response, turn-on pops can be minimized. analog reference bypass capacitor(c byp ) the analog reference bypass capacitor( c byp )is the most critical capacitor and serves several important functions.during start-up or recovery from shutdown mode, c byp determines the rate at which the amplifier starts up.the second function is to reduce noise caused by the power supply coupling into the output drive signal.this noise is from the internal analog reference to the amplifier,which appears as degraded psrr and thd+n. a ceramic bypass capacitor( c byp )with values of 0.47 f to 1.0 f .is recommended for the best thd and noise performance.increasing the bypass capacitor reduces clicking and popping noise from power on/off and entering and leaving shutdown.
MD3203N filterless 3w class-d stereo audio amplifier tel:+86-0755-27595155 27595165 fax:+86-0755-27594792 adress:: room 613,no b xingxinyuan business building, baomin 2nd road,bao'an zone,shenzhen city,china web:http:// www.chipsourcetek.com ordering information
MD3203N filterless 3w class-d stereo audio amplifier tel:+86-0755-27595155 27595165 fax:+86-0755-27594792 adress:: room 613,no b xingxinyuan business building, baomin 2nd road,bao'an zone,shenzhen city,china web:http:// www.chipsourcetek.com dimensions millimeters symbol min max a 1.350 1.750 a1 0.100 0.250 a2 1.350 1.550 b 0.330 0.510 c 0.190 0.250 d 9.800 10.000 e 3.800 4.000 e1 5.800 6.300 e 1.270typ l 0.400 1.270 0 8

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