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eua2014 ds2014 v e r 0.1 feb. 2008 1 2.5w stereo class-d a udio p ower amplifier with 3d enhancement description the eua 2 014 is a high effici ency, 2.5w/channel stereo class-d audio power amplifier. a low noise, filterless pwm architecture eliminates the output filter. operating from a single 5v supply, eua2014 is capable of delivering 2.5w/ channel of continuous output power to a 4 ? load with 10% thd+n. the eua2014 features independent shutdown controls for each channel. the gain can be selected to 6, 12, 18, or 24 db utilizing the g0 and g1 gain select pins. high psrr and differential architecture provide increased immunity to noise and rf rectification. the eua2014 also includes 3d audio enhancement that improves stereo sound quality. in devices where the left and right speakers are in clos e proximity, 3d enhancement affects channel specialization, widening the perceived soundstage. the eua2014 is available in space-saving tqfn package, is an idea choice for mobile phones and other portable communication devices. typical application cir cuit feat ures z un iq ue modulation scheme reduces emi emission z output power by tqfn package - 2.5w/ch in to 4 ? at 5v - 1.5w/ch into 8 ? at 5v - 750mw/ch into 8 ? at 3.6v z wide supply voltage: 2.5v to 5.5v z independent shutdown control for each channel z selectable gain of 6,12,18 and 24 db z internal pulldown resistor on shutdown pins z high psrr :70db at 217hz z fast 10ms startup time z low 4.7ma quiescent current at 3.6v supply and 1.5a shutdown current z short-circuit and thermal protection z 3d enhancement z space saving packages - 4mm 4mm tqfn-24 package z rohs compliant and 100% lead(pb)-free applicat ions z wi reless or cellular handsets and pdas z portable audios z notebook pc figure 1. v?mw`r?y?b? www.gofotech.com
eua2014 ds2014 ver 0.1 feb. 2008 2 pin configurations package type pin configurations tqfn-24 pin description pin name description 1 3dr+ right channel non-inverting 3d connection. connect to 3dl+ through c 3d+ and r 3d+ 2 inr+ right channel non-inverting input 3 inr- right channel inverting input 4 3den 3d enable input 5 inl- left channel inverting input 6 inl+ left channel non-inverting input 7 3dl+ left channel non-inverting 3d connection. connect to 3dr+ through c 3d+ and r 3d+ 8 3dl- left channel non-inverting 3d connection. connect to 3dr+ through c 3d- and r 3d- 9 g1 gain select input 1 10,21 pv dd speaker power supply 11 outla left channel inverting output 12 outlb left channel non-inverting output 13,18 pgnd power ground 14 sdl left channel active low shutdown. connect to vdd for normal operation. connect to gnd to disable the left channel. 15 ss/ ff modulation mode select. connect to vdd for spread spectrum mode. connect to gnd for fixed frequency mode. 16 sdr sdr right channel active low shutdown. co nnect to vdd for normal operation. connect to gnd to disable the right channel. 17 gnd ground 19 outrb right channel non-inverting output 20 outra right channel inverting output 22 v dd power supply 23 g0 gain select input 0 24 3dr- right channel muting 3d connection. connect to 3dl- through c 3d- and r 3d- n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2014 ds2014 ver 0.1 feb. 2008 3 ordering information order number package type marking operating temperature range EUA2014JIR1 tqfn-24 xxxxx a2014 -40 c to 85c eua2014 ?? ?? ?? ?? lead free code 1: lead free 0: lead packing r: tape & reel operating temperature range i: industry standard package type j: tqfn n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2014 ds2014 ver 0.1 feb. 2008 4 absolute maximum ratings t supply voltage ---------------------------------------------------------------------------------------------- 6v t input voltage ------------------------------------------------------------------------------------ -0.3 v to v dd +0.3v t junction temperature, t j ------------------------------------------------------------------------------------ 150c t storage temperature rang, t stg -------------------------------------------------------------------- -65c to 150c t esd susceptibility ------------ ------------------------------------------------------------------------ ------ 2kv t lead temperature 1,6 mm (1/16 inch) from case for 10 seconds --------------------------------------- 260c t thermal resistance ja (tqfn) ------------------------------------------------------------------------------------------------ 47c/w recommended operating conditions min max unit supply voltage, v dd ,pv dd 2.5 5.5 v high-level input voltage, sdl , sdr ,g0,g1, ss / ff ,3den 1.3 v low-level input voltage, sdl , sdr ,g0,g1, ss / ff ,3den 0.2 v operating free-air temperature, t a -40 85 c electrical characteristics v dd =pv dd =3.6v the following specifications apply for a v = 6db, r l = 15h + 8 ? + 15h, ss/ ff = v dd = (spread spectrum mode), f = 1khz, unless otherwise specified. limits apply for t a = 25c. eua2014 symbol parameter conditions min typ max. unit v os differential output offset voltage v in =0, vdd=2.5v to 5.5v 5 25 mv v dd = 3.6v, no load or output filter 4.7 6.5 i dd quiescent power supply current (both channels active) v dd = 5v, no load or output filter 7.3 9.5 ma i sd shutdown current v sdl =v sdr =gnd 0.8 1.5 a t wu wake up time v dd = 3.6v 10 ms ss/ ff =v dd (spread spectrum) 300 330 khz f sw switching frequency ss/ ff =gnd (fixed frequency) 300 khz g0,g1=gnd 5.5 6 6.5 g0=v dd , g1=gnd 11.5 12 12.5 g0=gnd, g1= v dd 17.5 18 18.5 a v gain g0,g1= v dd 23.5 24 24.5 db a v =6db 160 a v =12db 80 a v =18db 40 r in input resistance a v =24db 20 k ? n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2014 ds2014 ver 0.1 feb. 2008 5 electrical characteristics v dd =pv dd =3.6v the following specifications apply for a v = 6db, r l = 15h + 8 ? + 15h, ss/ ff = v dd = (spread spectrum mode), f = 1khz, unless otherwise specified. limits apply for t a = 25c. eua2014 symbol parameter conditions min typ max. unit r l =15uh + 4 ? + 15uh, thd 10% f=1khz, 22khz bw v dd =5v 2.5 w v dd =3.6v 1.2 w v dd =2.5v 0.5 w r l =15uh + 8 ? + 15uh, thd 10% f=1khz, 22khz bw v dd =5v 1.5 w v dd =3.6v 0.75 w v dd =2.5v 0.35 w r l =15uh + 4 ? + 15uh, thd 1% f=1khz, 22khz bw v dd =5v 1.85 w v dd =3.6v 1 w v dd =2.5v 0.45 w r l =15uh + 8 ? + 15uh, thd 1% f=1khz, 22khz bw v dd =5v 1.2 w v dd =3.6v 0.6 w p o output power (per channel) v dd =2.5v 0.27 w p o =500mw/ch, f=1khz, r l =8 ? 0.2 % thd+n total harmonic distortion p o =300mw/ch, f=1khz, r l =8 ? 0.22 % v ripple =200mv p-p sine, inputs ac gnd, c in =1uf, input referred f ripple =217hz 70 db psrr power supply rejection ratio f ripple =1khz 68 db cmrr common mode rejection ration v ripple =1v p-p , f ripple =217hz 60 db efficiency po=1w/ch, f=1khz, r l =8 ?, v dd =5v 86 % x talk crosstalk po=500mw/ch, f=1khz 82 db snr signal to noise ratio v dd =5v, po=1w, fixed frequency mode 88 db input referred, fixed frequency mode no weighted filter 66 v os output noise a-weighted filter 48 v n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2014 ds2014 ver 0.1 feb. 2008 6 typical operating characteristics figure2. figure4. figure6. figure3. figure5. figure7. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2014 ds2014 ver 0.1 feb. 2008 7 figure8. figure10. figure12. figure9. figure11. figure13. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2014 ds2014 ver 0.1 feb. 2008 8 figure14. figure16. figure18. figure15. figure17. figure19. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2014 ds2014 ver 0.1 feb. 2008 9 application information decoupling capacitor (c s ) the eua2014 is a high-performance class-d audio amplifier that requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distortion (thd) is low. for higher frequency transients, spikes, or digital hash on the line a good low equivalent-series-resistance (esr) ceramic capacitor, typically 1f, placed as close as possible to the device pv dd lead works best. placing this decoupling capacitor close to the eua2014 is important for the efficiency of the class-d amplifier, because any resistance or inductance in the trace be tween the device and the capacitor can cause a loss in efficiency. for filtering lower-frequency noise signa ls, a 4.7f or greater capacitor placed near the audio power amplifier would also help, but it is not required in most applications because of the high psrr of this device. table 1. gain setting g1 g0 gain (v/v) gain (db) input impedance (r in )(k? ) 0 0 2 6 160 0 1 4 12 80 1 0 8 18 40 1 1 16 24 20 input capacitors (c i ) the eua2014 does not require input coupling capacitors if the design uses a differential source that is biased from 0.5 v to v dd ? 0.8 v. if the input signal is not biased within the recommended common ? mode input range, if high pass filter (shown in figure 1), input coupling capacitors are required. the input capacitors and input resistors form a high-pass filter with the corner frequency, fc, determined in equation (1). --------------------------------------------(1) the value of the input capacitor is important to consider as it directly affects the bass (low frequency) performance of the circuit. speakers in wireless phones cannot usually respond well to low frequencies, so the corner frequency can be set to block low frequencies in this application. not using input capacitors can increase output offset. equation (2) is used to solve for the input coupling capacitance. --------------------------------------------(2) if the corner frequency is within the audio band, the capacitors should have a tolerance of 10% or better, because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below. component location place all the external components very close to the eua2014. placing the decoupling capacitor, cs, close to the eua2014 is important for the efficiency of the class-d amplifier. any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. filter free operation and ferrite bead filters a ferrite bead filter can often be used if the design is failing radiated emissions without an lc filter and the frequency sensitive circuit is greater than 1 mhz. this filter functions well for circuits that just have to pass fcc and ce because fcc and ce only test radiated emissions greater than 30 mhz. when choosing a ferrite bead, choose one with high impedance at high frequencies, and very low impedance at low frequencies. in addition, select a ferrite bead with adequate current rating to prevent distortion of the output signal. use an lc output filter if there are low frequency (< 1 mhz) emi sensitive circuits and/or there are long leads from amplifier to speaker. figure 20 shows typical ferrite bead and lc output filters. figure20. typical ferrite chip bead filter () i c i r2 1 c f = () c f i r2 1 i c = n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2014 ds2014 ver 0.1 feb. 2008 10 3d enhancement the eua2014 features 3d enhancement effect that widens the perceived soundstage of a stereo audio signal. the 3d enhancement increases the apparent stereo channel separation, improving audio reproduction whenever the left and right speakers are too close to one another. an external rc network shown in figure 1 is required to enable the 3d effect. beca use the eua2014 is a fully differential amplifier, there are two separate rc networks, one for each stereo input pair (inl+ and inr+, and inl- and inr-). set 3den high to enable the 3d effect. set 3den low to disable the 3d effect. the 3d rc network acts as a high pass filter. the amount of the 3d effect is set by the r 3d resistor. decreasing the value of r 3d increases the 3d effect. the c 3d capacitor sets the frequency at which the 3d effect occurs. increasing the value of c 3d decreases the low frequency cutoff point, extending the 3d effect over a wider bandwidth. the low frequency cutoff point is given by: enabling the 3d effect increase the gain by a factor of (1 +20k ? /r 3d ). setting r 3d to 20k ? results in a gain increase of 6db whenever the 3d eff ect is enabled. in fully differential configuration, the component values of the two rc networks must be identical. any component variations can affect the sound quality of the 3d effect. in single-ended configuration, only the rc network of the input pairs being driven by the audio source needs to be connected. for instance, if audio is applied to inr+ and inl+, then a 3d network must be connected between 3dl+ and 3dr+. 3dl- and 3dr- can be left unconnected. ( )( ) d3d3 )db3(d3 cr2/1f = ? n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eu a2014 ds2014 ve r 0.1 feb. 2008 11 packaging information tqfn-24 millimeters inches symbols min. max. min. max. a 0.70 0.8 0 0.028 0.031 a1 0.00 0.0 5 0.000 0.002 b 0.18 0.3 0 0.007 0.012 e 3.90 4.1 0 0.154 0.161 d 3.90 4.1 0 0.154 0.161 d1 2.70 0.1 06 e1 2.70 0.106 e 0.50 0.0 20 l 0.30 0.5 0 0.012 0.020 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com

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