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eu a2105 ds2105 ve r1.1 dec. 2009 1 5-w ster eo class-d a udio amplifier with 64-step dc v olume contr ol descript ion the eu a2 105 is a high efficiency, 2 channel bridged-tied load (btl), class-d audio power amplifier. operating from a 12v power supply, eua2105 is capable of delivering 5w/ channel of continuous output power to a 8 ? load with 1% thd+n. the eua2105 features a differential input architecture offering improved noise immunity over a single-ended (se) input amplif ier. stereo speaker volume is controlled with a dc voltage applied to the volume control terminal offering a range of gain from -68db to32 db. the eua2105 also features short-circuit and thermal protection preventing the device from being damaged during a fault condition. the eua2105 is available in thermally efficient 28-pin tssop package. fea tures z w ide supp ly voltage: 8v to 15v z unique modulation scheme reduces emi emission z 5w/ch into an 8 ? load from 12v supply z efficient, class-d operation eliminates heatsinks z 64-step dc volume control from -68db to 32db z thermal and short-circuit protection z integrated click and pop suppression z 28-pin tssop package with thermal pad z rohs compliant and 100% lead(pb)-free applica tions z lcd mon ito rs/tvs z all-in-one pcs t ypical application cir cuit figur e1. v?mw`r?y?b? www.gofotech.com
eu a2105 ds2105 ve r 1.1 dec. 2009 2 pin configurations package typ e pin configurations tssop-28 pin description pin tssop-2 8 i/o description linn 1 i n egati ve audio input for left channel. linp 2 i positive a u dio input for left channel. avcc 3 - high-volt age analog power supply. no t internally connected to pvccr or pvccl. fadeb 4 i inpu t for controlling volume ramp rate when cycling sd or during power-up. a logic low on this pin places the amplifier in fade mode. a logic high on this pin allows a quick transition to the desired volume setting. volume 5 i dc vo lta ge that sets the gain of the amplifier. vref 6 i analog reference f o r ga in control section. agnd 7 - an al og ground for digital/analog cells in core. bslp 8 i/o bootstrap i/o for left channe l, p o sitive high-side fet. loutp 9 o class-d 1/2-h -bridge positive output for left channel. loutn 10 o class-d 1/2-h-bridge negative output for left channel. bsln 11 i/o boo tstrap i/o for left channel, negative high-side fet. pvccl 12 - power supply for left channel h-brid ge, not i n ternally connected to pvccr or avcc. vclampl 13 - interna lly ge nerated voltage supply for left channel bootstrap capacitor. pgndl 14 - pow er ground for left channel h-bridge. pgndr 15 - pow er ground for right channel h-bridge. vcla mpr 16 - internally generated voltage supply for right channel bootstrap capacitor. pvccr 17 - powe r sup ply for right channel h-bridge, not connected to pvccl or avcc. bsrn 18 i/o bootstrap i/o for ri gh t c hannel, negative high-side fet. routn 19 o class-d 1/2-h-bridge negative output for right channel. routp 20 o class-d 1/2-h-bridge positive output for right channel. bsrp 21 i/o boot strap i/o for right channel, positive high-side fet. mute 22 i mute sig nal for quick disable/enable of outputs (high = outputs high-z, low = outputs enabled). ttl logic levels with compliance to avcc. shutdown 23 i shutdown signal for ic (low = di sabled, high = operational). ttl logic leve ls with compliance to avcc. vreg 24 o 4-v regulated output for use by internal cells, fadeb and mute pins only. not specified for driving othe r external circuitry. 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 a2105 ds2105 ve r 1.1 dec. 2009 3 pin description (contin u ed) pin tssop-28 i/o descripti on vbyp 25 o referenc e for preamplifier. nominally equal to 1.39v. also controls start-up time via external capacitor sizing. rosc 26 i/o i/o for current setting resi stor of ra mp generator. rin p 27 i positi ve audio input for right channel. rinn 28 i n egative audio input for right channel. ordering information order num b er package type marking operating temperature range eua2105q ir 1 tssop-28 xxxxx eua2105 -40 c to +85c eua2105 ?? ?? ?? ?? l ead free code 1: lead free 0: lead packing r: tape & reel operating temperature range i: industry standard package type q:tssop 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
eua2105 ds2105 ver1.1 dec. 2009 4 absolute maximum ratings t supply voltage range, av cc ,pv cc -------------------------------------------------------------------- -0.3 v to 18v t input voltage range, vref, volume, fadeb ---------------------------------------------------- 0v to 5.5v t input voltage range, shutdown , mute ------------------------------------------------ -0.3 v to v cc + 0.3v t input voltage range, rinn, rinp, linn, linp------------------------------------------------------ -0.3 v to 6v t continuous total power dissip ation --------------------------------------------------- see dissipation rating table t free-air temperature range, t a --------------------------------------------------------------------- -40c to +85c t junction temperature range, t j -------------------------------------------------------------------- -40c to +150c t storage temperature rang, t stg -------------------------------------------------------------------- -65c to +85c t lead temperature 1,6 mm (1/16 inch) from case fo r 10 seconds ----------------------------------------- +260c t esd susceptibility (hbm) ------------ ---------------------- --------------------------------------- ------------ >2kv typical dissipation ratings package t a 25c derating factor t a = 70c t a = 85c tssop-28 2.8w 26.3 mw/ c 1.8w 1.4w recommended operating conditions min max unit supply voltage pv cc , av cc 8 15 v volume reference voltage vref 2.7 4.2 v volume control pins, input voltage volume 4.2 v shutdown 2 mute 2 high-level input voltage, v ih fadeb 2.5 v shutdown 0.8 mute 0.8 low-level input voltage, v il fadeb 1.5 v mute, v i =5v, v cc =14v 10 shutdown , v i =14v, v cc =14v 80 high-level input current, i ih fadeb, v i =5v, v cc =14v 10 a low-level input current, i il mute, shutdown , fadeb v i =0v, v cc =14v 1 a oscillator frequency, f osc 200 300 khz operating free-air temperature, t a -40 85 c dc characteristics t a = +25c , v cc =12v, r l =8 ? (unless otherwise noted) eua2105 symbol parameter conditions min t yp max. unit os v output offset voltage (measured differentially) inn and inp connected together, gain=36 db 5 50 mv psrr power supply rejection ratio v cc = 11.5v to 12.5v -60 db bypass reference for input amplifier vbyp, no load 1.3 1.4 1.6 v 4-v internal supply voltage vreg, no load 3.9 4.2 4.6 v icc supply quiescent current mute=0v, shutdown =2v no load, filter or snubber 20 28 ma 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
eua2105 ds2105 ver1.1 dec. 2009 5 dc characteristics t a = +25c , v cc =12v, r l =8 ? (unless otherwise noted) (continued) eua2105 symbol parameter conditions min t yp max. unit icc( mute ) mute mode quiescent current mute=3.5v, shutdown =2v 5 10 ma icc( sd ) supply quiescent current in shutdown mode shutdown =0.8v 500 1000 a high side 400 500 low side 400 500 r ds (on) drain-source on-state resistance v cc =12v, i o =1a, t j =25c total 800 1000 m ? ac characteristics t a = +25c , v cc =12v, r l =8 ? (unless otherwise noted) eua2105 symbol parameter conditions min t yp max unit k svr supply ripple rejection ratio v cc =11.5v to 12.5v from 10hz to 1khz, gain=36db -60 db thd+n=1%, f=1khz, r l =8 ? 5 p o(max) maximum continuous output power thd+n=10%, f=1khz, r l =8 ? 6 w thd+n total harmonic distortion +noise r l =8 ? , f=1khz, p o =3w (half-power) 0.2% vn output integrated noise floor 20hz to 22khz,no weighting filter, gain=0.5db -73 dbv crosstalk, left ? right gain=20db, p o =1w, r l =8 ? -100 db thermal trip point 150 c thermal hystersis 40 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
eua2105 ds2105 ver1.1 dec. 2009 6 block diagram figure2. 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
eua2105 ds2105 ver1.1 dec. 2009 7 table 1. dc volume control volume position volume input voltage(v) increasing volume (volume pin voltage as a percentage of vref) (%) decreasing volume (volume pin voltage as a percentage of vref) (%) gain (db) 0 0.100 x vref 0.0 - 11.1 0.0 - 10.2 -68.6 1 0.113 x vref 11.1 - 12.3 10.2 - 11.5 -66.0 2 0.126 x vref 12.3 - 13.6 11.5 - 12.8 -63.5 3 0.138 x vref 13.6 - 14.9 12.8 - 14.0 -60.9 4 0.151 x vref 14.9 - 16.2 14.0 - 15.3 -58.4 5 0.164 x vref 16.2 - 17.4 15.3 - 16.5 -55.9 6 0.176 x vref 17.4 - 18.7 16.5 - 17.8 -53.3 7 0.189 x vref 18.7 - 20.0 17.8 - 19.1 -50.8 8 0.202 x vref 20.0 - 21.2 19.1 - 20.4 -48.2 9 0.214 x vref 21.2 - 22.5 20.4 - 21.6 -45.7 10 0.227 x vref 22.5 - 23.8 21.6 - 22.9 -43.2 11 0.240 x vref 23.8 - 25.0 22.9 - 24.2 -40.6 12 0.252 x vref 25.0 - 26.3 24.2 - 25.4 -38.1 13 0.265 x vref 26.3 - 27.6 25.4 - 26.7 -35.6 14 0.278 x vref 27.6 - 28.8 26.7 - 28.0 -33.0 15 0.290 x vref 28.8 - 30.1 28.0 - 29.2 -30.5 16 0.303 x vref 30.1 - 31.4 29.2 - 30.5 -27.9 17 0.316 x vref 31.4 - 32.6 30.5 - 31.8 -25.4 18 0.328 x vref 32.6 - 33.9 31.8 - 33.0 -22.9 19 0.341 x vref 33.9 - 35.2 33.0 - 34.3 -20.3 20 0.354 x vref 35.2 - 36.5 34.3 - 35.6 -17.8 21 0.366 x vref 36.5 - 37.7 35.6 - 36.8 -15.2 22 0.379 x vref 37.7 - 39.0 36.8 - 38.1 -12.7 23 0.392 x vref 39.0 - 40.3 38.1 - 39.4 -10.2 24 0.405 x vref 40.3 - 41.5 39.4 - 40.7 -7.6 25 0.417 x vref 41.5 - 42.8 40.7 - 41.9 -5.1 26 0.430 x vref 42.8 - 44.1 41.9 - 43.2 -2.5 27 0.443 x vref 44.1 - 45.3 43.2 - 44.5 0.0 28 0.455 x vref 45.3 - 46.6 44.5 - 45.7 1.3 29 0.468 x vref 46.6 - 47.9 45.7 - 47.0 2.5 30 0.481 x vref 47.9 - 49.1 47.0 - 48.3 3.8 31 0.493 x vref 49.1 - 50.4 48.3 - 49.5 5.0 32 0.506 x vref 50.4 - 51.7 49.5 - 50.8 6.3 33 0.519 x vref 51.7 - 52.9 50.8 - 52.1 7.5 34 0.531 x vref 52.9 - 54.2 52.1 - 53.3 8.8 35 0.544 x vref 54.2 - 55.5 53.3 - 54.6 10.0 36 0.557 x vref 55.5 - 56.8 54.6 - 55.9 11.3 37 0.569 x vref 56.8 - 58.0 55.9 - 57.1 12.5 38 0.582 x vref 58.0 - 59.3 57.1 - 58.4 13.8 39 0.595 x vref 59.3 - 60.6 58.4 - 59.7 15.0 40 0.608 x vref 60.6 - 61.8 59.7 - 60.9 16.3 41 0.620 x vref 61.8 - 63.1 60.9 - 62.2 17.5 42 0.633 x vref 63.1 - 64.4 62.2 - 63.5 18.8 43 0.646 x vref 64.4 - 65.6 63.5 - 64.8 20.0 44 0.658 x vref 65.6 - 66.9 64.8 - 66.0 20.6 45 0.671 x vref 66.9 - 68.2 66.0 - 67.3 21.2 46 0.684 x vref 68.2 - 69.4 67.3 - 68.6 21.8 47 0.696 x vref 69.4 - 70.7 68.6 - 69.8 22.4 48 0.709 x vref 70.7 - 72.0 69.8 - 71.1 23.0 49 0.722 x vref 72.0 - 73.2 71.1 - 72.4 23.6 50 0.734 x vref 73.2 - 74.5 72.4 - 73.6 24.2 51 0.747 x vref 74.5 - 75.8 73.6 - 74.9 24.8 52 0.760 x vref 75.8 - 77.1 74.9 - 76.2 25.4 53 0.772 x vref 77.1 - 78.3 76.2 - 77.4 26.0 54 0.785 x vref 78.3 - 79.6 77.4 - 78.7 26.6 55 0.798 x vref 79.6 - 80.9 78.7 - 80.0 27.2 56 0.811 x vref 80.9 - 82.1 80.0 - 81.2 27.8 57 0.823 x vref 82.1 - 83.4 81.2 - 82.5 28.4 58 0.836 x vref 83.4 - 84.7 82.5 - 83.8 29.0 59 0.849 x vref 84.7 - 85.9 83.8 - 85.1 29.6 60 0.861 x vref 85.9 - 87.2 85.1 - 86.3 30.2 61 0.874 x vref 87.2 - 88.5 86.3 - 87.6 30.8 62 0.887 x vref 88.5 - 89.7 87.6 - 88.9 31.4 63 0.899 x vref 89.7 - 91.0 88.9 - 90.1 32.0 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
eua2105 ds2105 ver1.1 dec. 2009 8 typical characteristics figure3. figure4. figure5. figure6 figure7. figure8. 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
eua2105 ds2105 ver1.1 dec. 2009 9 figure9. figure10. figure11. figure12. figure13. figure14. 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
eua2105 ds2105 ver1.1 dec. 2009 10 figure15. figure16. figure17. figure18. figure19. figure20. 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
eua2105 ds2105 ver1.1 dec. 2009 11 figure21. 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
eua2105 ds2105 ver1.1 dec. 2009 12 application information volume control operation the volume terminal controls the internal amplifier gain. this pin is controlled with a dc voltage, which should not exceed vref. table 1 lists the gain as determined by the voltage on the volume pin in reference to the voltage on vref. if using a resistor divider to fix the gain of the amplifier, the vref terminal can be directly connected to vreg and a resistor divider can be connected across vref and agnd. (see figure 25 in the application information section). for fixed gain, calculate the resistor divider values necessary to center the voltage between the two percentage points given in the first column of table 1. if using a dac to control the class-d gain, vref and agnd should be connected to the reference voltage for the dac and the gnd terminal of the dac, respectively. for the dac application, vreg would be left unconnected to vref. the reference voltage of the dac provides the reference to the internal gain circuitry through the vref input and any fluctuations in the dac output voltage will not affect the eua2105 gain. the percentages in the first column of table 1 should be used for setting the voltages of the dac when the voltage on the volume terminal is increased. the percentages in the second column should be used for the dac voltages when decreasing the voltage on the volume terminal. two lookup tables should be used in software to control the gain based on an increase or decrease in the desired system volume. if using an analog potentiometer to control the gain, it should be connected between vref and agnd. vref can be connected to vreg or an external voltage source, if desired. the 3rd and 4th column in table 1 should be used to determine the point at which the gain changes depending on the direction that the potentiometer is turned. if the voltage on the center tap of the potentiometer is increasing, the 3rd column in table 1 should be referenced to determine the trip points. if the voltage is decreasing, the trip points in the 4th column should be referenced. the trip point, where the gain actually changes, is different depending on whether the voltage on the volume terminal is increasing or decreasing as a result of hysteresis about each trip point. the hysteresis ensures that the gain control is monotonic and does not oscillate from one gain step to another. a pictorial representation of the volume control can be found in figure 22. the timing of the volume control circuitry is controlled by an internal 30-hz clock. this clock determines the rate at which the gain changes when adjusting the voltage on the external volume control pins. the gain updates every clock cycle (nominally 33 ms) to the next step until the final desired gain is reached. for example, if the eua2105 is currently in the 0 db gain step and the volume pin is adjusted for maximum gain at +32 db, the time required for the gain to reach +32 db is 36 steps x 33ms/step = 1.188 seconds. figure 22. dc volume control operation fade operation the fadeb terminal is a logic input that controls the operation of the volume control circuitry during transitions to and from the shutdown state and during power-up. a logic low on this terminal places the amplifier in the fade mode. during power-up or recovery from the shutdown state (a logic high is applied to the shutdown terminal), the volume is smoothly ramped up from the mute state, -68 db, to the desired volume setting determined by the voltage on the volume control terminal. conversely, the volume is smoothly ramped down from the current state to the mute state when a logic low is applied to the shutdown terminal. a logic high on this pin disables the volume fade effect during transitions to and from the shutdown state and during power-up. during power-up or recovery from the shutdown state (a logic high is applied to the shutdown terminal), the transition from the mute state, -68 db, to the desired volume setting is less than 1 ms. conversely, the volume ramps down from current state to the mute state within 1 ms when a logic low is applied to the shutdown terminal. shutdown operation the eua2105 employs a shutdown mode of operation designed to reduce supply current (i cc ) to the absolute minimum level during periods of nonuse for power conservation. the shutdown input terminal should be held high (see specification table for trip point) during normal operation when the amplifier is in use. pulling shutdown low causes the outputs to mute and the amplifier to enter a low-current state. shutdown should never be left unconnected, because amplifier operation would be unpredictable. for th e best power-off pop performance, the amplifier should be placed in the shutdown mode prior to removing the power supply voltage. 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
eua2105 ds2105 ver1.1 dec. 2009 13 mute operation the mute pin is an input for controlling the output state of the eua2105. a logic high on this pin disables the outputs. a logic low on this pin enables the outputs. this pin may be used as a quick disable or enable of the outputs without a volume fade.quiescent current is listed in the dc characteristics specification table. the mute pin should never be left floating. for power conservation, the shutdown pin should be used to reduce the quiescent current to the absolute minimum level. the volume will fade, slowly increase or decrease, when leaving or entering the shutdown state if the fadeb terminal is held low. if the fadeb terminal is held high, the outputs will transition very quickly. refer to the fadeb operation section. short-circuit protection the eua2105 has short-circuit protection circuitry on the outputs that prevents damage to the device during output-to-output shorts, output-to-gnd shorts, and output-to-vcc shorts. when a short circuit is detected on the outputs, the part immediately disables the output drive. this is a latched fault and must be reset by cycling the voltage on the shutdown pin or mute pin. thermal protection thermal protection on the eua2105 prevents damage to the device when the internal die temperature exceeds 150 o c. there is a 10 o c tolerance on this trip point from device to device. once the die temperature exceeds the thermal set point, the device enters into the shutdown state and the outputs are disabled. this is not a latched fault. the thermal fault is cleared once the temperature of the die is reduced by 40 o c. the device begins normal operation at this point with no external system interaction. input resistance changing the gain setting can vary the input resistance of the amplifier from its smallest value, 80 k ? 20%. as a result, if a single capacitor is used in the input high-pass filter, the -3 db or cutoff frequency may change when changing gain steps. the -3db frequency can be calculated using equation 1. use the z i values given in table 1. ---------------- (1) input capacitor, c i in the typical application, an input capacitor (c i ) is required to allow the amplifier to bias the input signal to the proper dc level for optimum operation. in this case, c i and the input impedance of the amplifier (z i ) form a high-pass filter with the corner frequency determined in equation 2. ----------------- (2) the value of c i is important, as it directly affects the bass (low-frequency) performance of the circuit. consider the example where z i is 64 k ? and the specification calls for a flat bass response down to 20 hz. equation 2 is reconfigured as equation 3. ----------------- (3) in this example, c i is 0.12 f; so, one would likely choose a value of 0.22 f as this value is commonly used. if the gain is known and is constant, use z i from table 1 to calculate c i . power supply decoupling the eua2105 is a high-performance cmos audio amplifier that requires adequate power supply decoupling to ensure the output total harmonic distortion (thd) is as low as possible. power supply decoupling also prevents oscillations for long lead lengths between the amplifier and the speaker. the optimum decoupling is achieved by using two capacitors of different types that target different types of noise on the power supply leads. for higher frequency transients, spikes, or digital hash on the line, a good low equivale nt-series-resistance (esr) ceramic capacitor, typically 1f placed as close as possible to the device v cc lead works best. for filtering lower-frequency noise si gnals, a larger capacitor of 10f or greater placed near the audio power amplifier is recommended. i c i z2 1 f = i c i z2 1 c f = c f i z2 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
eua2105 ds2105 ver1.1 dec. 2009 14 bsn and bsp capacitors the full h-bridge output stages use only nmos transistors, that require bootstrap capacitors for the high side of each output to turn on correctly. a 220nf~1uf ceramic capacitor, rated for at least 16v, must be connected from each output to its corresponding bootstrap input. the bootstrap capacitors connected between the bsxx pins and corresponding output function as a floating power supply for the high-side n-channel power mosfet gate drive circuitry. during each high-side switching cycle, the bootstrap capacitors hold the gate-to-source voltage high enough to keep the high-side mosfets turned on. vclamp capacitors the eua2105 also features two regulators used for gate voltage clamping in order to ensure the maximum gate-to-source voltage for the nmos output transistors is not exceeded. two 1 f capacitors must be connected from vclampl (pin 13) and vclampr (pin 16) to ground and must be rated for at least 16v. the voltages at the vclamp terminals may vary with v cc and may not be used for powering any other circuitry. output pin snubbers 1nf capacitors in series with 20 ? resistors form the outputs of the eua2105 ic to ground are switching snubbers. these are illustrated in figure 23.they linearize switching transitions and reduce overshoot and ringing. by doing so they improve thd+n and emc. they increase quiescent current by 5 to 15ma depending on power supply voltage. figure23. vbyp capacitor the internal bias generator (vbyp) nominally provides a 1.4v internal bias for the preamplifier stages. the external input capacitors and this internal reference allow the inputs to be biased within the optimal common-mode range of the input preamplifiers. the selection of the capacitor value on the vbyp terminal is critical for achieving the best device performance. during power up or recovery from the shutdown state, the vbyp capacitor determines the rate at which the amplifier starts up. the charge rate of the capacitor is calculated using the standard charging formula for a capacitor, i = c x dv/dt. the charge current is nominally equal to 125 a and dv is equal to vbyp. for example, a 1 f capacitor on vbyp would take 10 ms to reach the value of vbyp and turn on outputs. the turn-on time will <30 ms for a 1 f capacitor on the vbyp terminal. a secondary function of the vbyp capacitor is to filter high-frequency noise on the inte rnal 1.4v bias generator. a value of at least 1 f is recommended for the vbyp capacitor. for the best power-up and shutdown pop performance, the vbyp capacitor should be greater than or equal to the input capacitors. using low-esr capacitors use capacitors with an esr less than 100m ? for optimum performance. low-esr ceramic capacitors minimize the output resistance. for best performance over the extended temperature range, select x7r capacitors. output filter most applications require a ferrite bead filter. the ferrite filter reduces emi around 1 mhz and higher (fcc and ce only test radiated emissions greater than 30 mhz). when selecting a ferrite bead, choose one with high impedance at high frequencies, but low impedance at low frequencies. use an lc output filter if there are low frequency (<1 mhz) emi-sensitive circuits and/or there are long wires from the amplifier to the speaker. when both an lc filter and a ferrite bead filter are used, the lc filter should be placed as close as possible to the ic followed by the ferrite bead filter. figure24. figure25. 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 a2105 ds2105 ve r 1.1 dec. 2009 15 figure26 . 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 a2105 ds2105 ve r 1.1 dec. 2009 16 package information tssop-28 millimeters inches symbols min. max. min. max. a - 1.2 0 - 0.047 a1 0.00 0.1 5 0.000 0.006 b 0.19 0.3 0 0.007 0.012 e1 4.40 0.1 73 d 9.6 0 9.8 0 0.3 78 0.386 d1 3.05 3.5 5 0.120 0.139 e 6.20 6.6 0 0.244 0.260 e2 2.62 3.1 2 0.103 0.122 e 0.65 0.0 26 l 0.45 0.7 5 0.018 0.030 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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