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eua2045 ds2045 ver 0.1 mar. 2012 1 non-clip, low emi, 2.8w mono filterless class-d audio power amplifier with auto-recovery description the eua2045 is a high efficiency, 2.8w mono class-d audio power amplifier with non-clip. a low noise, f ilterless pwm architecture eliminates the output filter, redu cing external component count, system cost, and simplify ing design. operating in a single 5v supply, eua2045 is capable of driving 4 speaker load at a continuous average output of 2.8w/10% thd+n or 2.2w/1% thd+n. the eua2045 has high efficiency with speaker load compared to a typical class ab amplifier. with a 3.6v supply driving an 8 speaker , the efficiency for a 400mw power level is 84%. eua2045 feature non-clip output control function wh ich detects output signal clip due to the over level in put signal and suppress the output signal clip automatically. also the non-clip output control function can adapt the outp ut clip cause by power supply voltage down with battery. in cellular handsets, the earpiece, speaker phone, and melody ringer can each be driven by the eua2045. the eua2045 is available in space-saving wcsp and tdfn-8 packages. typical application circuit features unique modulation scheme reduces emi emissions unique non-clip function , variable ncn1, ncn2,ncnoff mode select short circuit auto-recovery efficiency at 3.6v with an 8- speaker: ? 84% at 400 mw low quiescent current and shutdown current 2.5v to 5.5v wide supply voltage shutdown pin compatible with 1.8v logic gpio optimized pwm output stage eliminates lc output filter improved psrr ( -68 db) eliminates need for a voltage regulator fully differential design reduces rf rectification and eliminates bypass capacitor improved cmrr eliminates two input coupling capacitors internally generated 325-khz switching frequency integrated pop and click suppression circuitry 1.5mm 1.5mm wafer chip scale package (wcsp) and 3mm 3mm tdfn-8 package rohs compliant and 100% lead(pb)-free halogen-free applications ideal for wireless or cellular handsets and pdas figure1.
eua2045 ds2045 ver 0.1 mar. 2012 2 pin configurations package type pin configurations package type pin configurations wcsp-9 tdfn-8 pin description pin wcsp-9 tdfn-8 i/o description inp a1 5 a positive input terminal (differential +) vdd a2 7 power power supply vop a3 8 o positive output terminal (differential +) agnd b1 thermal pad gnd gnd for analog circuits vref b2 6 a analog reference power supply terminal pgnd b3 1 gnd gnd for output inn c1 4 a negative input terminal (differential -) ctrl c2 3 i shut down and non-clip control terminal von c3 2 o negative output terminal (differential -) (note) i: input terminal o: output terminal a: an alog terminal
eua2045 ds2045 ver 0.1 mar. 2012 3 ordering information order number package type marking operating temperat ure range EUA2045HIR1 wcsp-9 xxx j00 -40 c to +85c eua2045jir1 tdfn-8 xxxxx a2045 -40 c to +85c eua2045 lead free code 1: lead free, halogen-free packing r: tape & reel operating temperature range i: industry standard package type h: wcsp j: tdfn
eua2045 ds2045 ver 0.1 mar. 2012 4 absolute maximum ratings supply voltage, v dd ------------------------------------------------- ------------------------------------ -0.3 v to 6v voltage at any input pin ------------------------- ------------------------------------------------ - 0.3 v to v dd +0.3v junction temperature, t jmax -------------------------------------------------- ------------------------------------- 150c storage temperature rang, t stg ------------------------------------------------- -------------------- -65c to 150c esd susceptibility -------------------------------- --------------------------------------------------- --------- 2kv lead temperature 1,6 mm (1/16 inch) from case for 10 seconds ----------------------------------------- 260c thermal resistance ja (wcsp-9) ---------------------------------------- --------------------------------------------------- ----- 110c/w ja (tdfn-8) ---------------------------------------- --------------------------------------------------- ----- 72c/w recommended operating conditions min. max. unit supply voltage, v dd 2.5 5.5 v common mode input voltage range, v ic v dd =2.5v,5.5v,cmrr -49db 0.5 v dd -0.8 v operating free-air temperature, t a -40 85 c electrical characteristics t a = 25c (unless otherwise noted) eua2045 symbol parameter conditions min. typ. max. unit os v output offset voltage (measured differentially) v i= 0v,a v =2 v/v, v dd =2.5v to 5.5v 1 25 mv psrr power supply rejection ratio v dd = 2.5v to 5.5v -68 -55 db ih i high-level input current v dd = 5.5v, v i = 5.8v 1 a il i low-level input current v dd = 5.5v, v i = -0.3v 1 a v dd = 5.5v, no load 4.8 v dd = 3.6v, no load 4.0 i (q) quiescent current v dd = 2.5v, no load 3.5 ma i (sd) shutdown current v ctrl =0v, v dd = 2.5v to 5.5v 0.5 a v dd = 2.5v 700 v dd = 3.6v 500 rds(on) static drain-source on-state resistance v dd = 5.5v 400 m f (sw) switching frequency v dd = 2.5v to 5.5v 270 325 380 khz v uvlh power supply start-up threshold voltage 2 v v uvll power supply shut- down threshold voltage 1.8 v
eua2045 ds2045 ver 0.1 mar. 2012 5 electrical characteristics t a = 25c ,gain= 2v/v,r l =8 (unless otherwise noted) eua2045 symbol parameter conditions min. typ. max. unit v dd = 5v 2.8 v dd = 3.6v 1.42 thd+n=10%, f=1khz, r l =4 v dd = 2.5v 0.68 w v dd = 5v 2.26 v dd = 3.6v 1.14 thd+n=1%, f=1khz, r l =4 v dd = 2.5v 0.54 w v dd = 5v 1.67 v dd = 3.6v 0.86 thd+n=10%, f=1khz, r l =8 v dd = 2.5v 0.42 w v dd = 5v 1.36 v dd = 3.6v 0.69 p o output power thd+n=1%, f=1khz, r l =8 v dd = 2.5v 0.33 w v dd = 5v,p o =1w, r l =8 , f=1khz 0.15 v dd = 3.6v,p o =0.5w, r l =8 , f=1khz 0.15 thd+n total harmonic distortion plus noise v dd = 2.5v,p o =200mw, r l =8 , f=1khz 0.15 % ksvr supply ripple rejection ratio v dd = 3.6v, inputs ac-grounded with c i = 2 f f=217 hz, v (ripple) =200mvpp -60 db snr signal-to-noise ratio v dd = 5v,p o =1w, r l =8 89 db no weighting 181 vn output voltage noise v dd = 3.6v, f=20hz to 20khz,inputs ac-grounded with c i = 2 f a weighting 140 v rms t stup start-up time cr= 1 f 32 ms t wk wake-up mode settling time 180 ms t sd shutdown settling time 180 ms t mod each mode settling time 0.1 ms ncn v ncn1 non-clip1 mode setting threshold voltage 1.20 v dd v v ncn2 non-clip2 mode setting threshold voltage 0.80 1.10 v v ncno non-clip off mode setting threshold voltage 0.36 0.68 v v sd shut down mode setting threshold voltage 0 0.14 v t at1 attack time 1 v dd = 3.6v 45 ms t rl1 release time 1 v dd = 3.6v 2.6 s t at2 attack time 2 v dd = 3.6v 10 ms t rl2 release time 2 v dd = 3.6v 1.2 s a max -10 db
eua2045 ds2045 ver 0.1 mar. 2012 6 figure2.
eua2045 ds2045 ver 0.1 mar. 2012 7 typical operating characteristics figure3. figure5. figure7. figure4. figure6. figure8.
eua2045 ds2045 ver 0.1 mar. 2012 8 figure9. figure11. figure13. figure10. figure12. figure14.
eua2045 ds2045 ver 0.1 mar. 2012 9 figure15. figure17. figure19. figure16. figure18. figure20.
eua2045 ds2045 ver 0.1 mar. 2012 10 figure21. figure23. figure25. figure22. figure24. figure26.
eua2045 ds2045 ver 0.1 mar. 2012 11 figure27. figure28.
eua2045 ds2045 ver 0.1 mar. 2012 12 application information fully differential amplifier the eua2045 is a fully differential amplifier that features differential inputs and outputs. the eua2045 also includes a common mode feedback loop that controls the output bias value to average it at v dd /2 for any dc common mode input voltage. this allows the device t o always have a maximum output voltage swing, and by consequence, maximize the output power. moreover, a s the load is connected differentially, compared to a single-ended topology, the output is four times hig her for the same power supply voltage. the fully differenti al eua2045 can still be used with a single-ended input ; however, the eua2045 should be used with differenti al inputs when in a noisy environment, like a wireless handset, to ensure maximum noise rejection. advantages of fully differential amplifiers the advantages of a full-differential amplifier are : very high psrr (power supply rejection ratio). high common mode noise rejection. virtually zero pop without additional circuitry, giving an faster start-up time compared to conventional single-ended input amplifiers. no input coupling capacitors required thanks to common mode feedback loop. midsupply bypass capacitor not required. figure 29. differential input configuration figure 30. differential input configuration and inp ut capacitors figure 31. single-ended input configuration short circuit auto-recovery when a short circuit event happens, the eua2045 goe s to shutdown mode and tries to reactivate itself after few milliseconds. this auto-recovery will continue unti l the short circuit event is removed. power supply decoupling capacitor (c s ) the eua2045 is a high-performance cmos class-d audio amplifier that requires adequate power supply decoupling to ensure the efficiency is high and tot al harmonic distortion (thd) is low. for higher freque ncy transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (esr) ceramic capacito r, typically 1 f, placed as close as possible to the device v dd lead works best. placing this decoupling capacitor close to the eua2045 is very important for the effi ciency of the class-d amplifier, because any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. for filte ring lower-frequency noise signals, a 10 f or greater capacitor placed near the audio power amplifier would also he lp. single-ended input depop function in single-ended input application, there is an inhe rently voltage difference in input pairs when shutdown is released. in order to eliminate pop noise, the pop cancellation circuit need to charge the input capac itor c i until fully-differential inputs are balanced and ou tput power to load gradually. protection function eua2045 has the following protection functions for the digital amplifier; over-current protection function , thermal protection function, and low voltage malfunction prevention function. over-current protection function this is the function to establish the over-current protection mode when detecting a short circuit betw een eua2045 differential output terminal and vss, vdd, or another differential output. in the over current pr otection mode, the differential output terminal becomes a hi gh impedance state.
eua2045 ds2045 ver 0.1 mar. 2012 13 the over current protection mode can be cancelled b y shut down or turning on the power again. thermal protection function this is the function to establish the thermal prote ction mode when detecting excessive high temperature of eua2045 itself. in the thermal protection mode, the differential output terminal becomes weak low state (a state grounded through high resistivity). and, when eua2045 gets out of such condition, the protection mode is cancelled. low voltage malfunction prevention function this is the function to establish the low voltage p rotection mode when vdd terminal voltage becomes lower than the detection voltage (v uvll ) for the low voltage malfunction prevention and to cancel the protection mode when vdd terminal voltage becomes higher than the threshold voltage (v uvlh ) and by return procedure form shut down for its deactivation. (in sag state , this function works and eua2045 bec omes a low voltage protection mode.) in the low voltage protection mode, the differentia l output pin becomes weak low state (a state grounded throug h high resistivity). eua2045 will start up within the start-up time (t stup ) when the low voltage protection mode is cancelled. control function vref terminal output the voltage of vdd/2 is output from the vref termin al, capacitor (1 f ) is connected between the vref terminal and gnd for stabilization. shut down and initialization function when ctrl terminal is connected to gnd potential, t he ic goes to the shut-down mode. in the mode, all the circuit functions stop and its current consumption becomes the lowest. and, the output terminals becom e weak low (a high resistance grounded state). when in the shut-down mode, the level of the termin al must not be changed from gnd level during t sd . on the contrary, when ctrl terminal is set to h lev el, the shut-down mode is canceled and the ic starts up aft er startup time (t stup ). caution : please start up the former source circuit first to stabilize the dc bias point (see figure 32 - 2 22 2 ) and then cancel the shut-down state of eua2045. the time (t dly ) required to stabilize the voltage can be found by the formula ( see (1) shown below). and, signal variation in the former s ource circuit should be a value lower than pvdd. figure 32. circuit diagram -----------------------(1) in order to return from the shut-down mode a desire d mode needs to be set after setting both ctrl1 and ctrl2 to h level during t wk . in addition, at startup, cancel the shut-down mode after supply voltages has been sufficiently stabilized. figure 33. ctrl terminal function by connection external resistors (rctrl1, rctrl2, a nd rctrl3: accuracy of 1%) to ctrl terminal, and impression setting threshold voltage of each mode t o ctrl terminal, the followings can be set : non-clip 1, non-clip2, non-clip off, and shut-down mode. when turning on the supply voltage or canceling the shut -down mode, control the ctrl terminal according to proced ure for canceling shut-down (see page6.) connect the terminal to the ground through a capaci tor cctrl (a ceramic capacitor of 0.1 f or more). 3 10 330 c t 3 in dly 3
eua2045 ds2045 ver 0.1 mar. 2012 14 figure 34. h level indicates a microcomputers i/o port h le vel output voltage that is input to ctrl1 and ctrl2 terminals and gnd indicates gnd of the microcompute r. gnd level of the microcomputer must be the same as that of eua2045. the control of ctrl terminal is based on i/o port h level output voltage of microcomputer that is connected. set resistance constants according to i/o port h le vel output voltage of each microcomputer as shown below . i/o port h level output voltage of microcomputer 1.8v 2.6v 3.0v 3.3v 5.0v rctrl 1 27k 33k 33k 33k 56k rctrl 2 56k 68k 68k 68k 120k rctrl 3 82k 27k 22k 18k 15k functions of ctrl pin are designed with their contr ol by two control pins (ctrl1 and ctrl2). only a switching control between non-clip1 mode and shut-down mode is available when a single control terminal is used. a setting voltage should be set a ccording to v ncn1 and v sd , and use a rc filter with time constant of 1msec or more in order to eliminate noi se at transmission side such as micon etc. (example. rctrl=10k and cctrl=0.1 f). figure 35. ctrl1 function h non-clip 1 mode gnd shut-down mode pcb layout as output power increases, interconnect resistance (pcb traces and wires) between the amplifier, load and p ower supply create a voltage drop. the voltage loss on t he traces between the eua2045 and the load results is lower output power and decreased efficiency. higher trace resistance between the supply and the eua2045 has t he same effect as a poorly regulated supply, increase ripple on the supply line also reducing the peak output po wer. the effects of residual trace resistance increases as output current increases due to higher output power, decre ased load impedance or both. to maintain the highest out put voltage swing and corresponding peak output power, the pcb traces that connect the output pins to the load and the supply pins to the power supply should be as wide a s possible to minimize trace resistance. the use of power and ground planes will give the be st thd+n performance. while reducing trace resistance, the use of power planes also creates parasite capacitor s that help to filter the power supply line. the inductive nature of the transducer load can als o result in overshoot on one or both edges, clamped by the parasitic diodes to gnd and v dd in each case. from an emi stand- point, this is an aggressive waveform th at can radiate or conduct to other components in the syste m and cause interference. it is essential to keep the pow er and output traces short and well shielded if possible. use of ground planes, beads, and micro-strip layout techni ques are all useful in preventing unwanted interference. as the distance from the eua2045 and the speaker increase, the amount of emi radiation will increase since the output wires or traces acting as antenna become more efficient with length. what is acceptable emi is hi ghly application specific. ferrite bead and capacitance placed close to the eu a2045 may be needed to reduce emi radiation. select a fer rite bead with the high impedance around 100mhz and a ve ry low dcr value in the audio frequency range is the b est choice. the mpz1608s221a1 from tdk is a good choice. figure 36. optional emi ferrite bead filter ctrl1 ctrl2 function h h non-clip 1 mode h gnd non-clip 2 mode gnd h non-clip off mode gnd gnd shut-down mode
eua2045 ds2045 ver 0.1 mar. 2012 15 packaging information wcsp-9 millimeters inches symbols min. max. min. max. a - 0.675 - 0.027 a1 0.15 0.35 0.006 0.014 d 1.45 1.55 0.057 0.061 d1 0.50 0.020 e 1.45 1.55 0.057 0.061 e1 0.50 0.020
eua2045 ds2045 ver 0.1 mar. 2012 16 tdfn-8 millimeters inches symbols min. max. min. max. a 0.70 0.80 0.028 0.031 a1 0.00 0.05 0.000 0.002 b 0.20 0.40 0.008 0.016 d 2.90 3.10 0.114 0.122 d1 1.90 2.35 0.075 0.093 e 2.90 3.10 0.114 0.122 e1 1.50 1.75 0.059 0.069 e 0.65 0.026 l 0.25 0.45 0.010 0.018 detail a

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