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EUA4890A ds4890a ver 1.2 sep. 2007 1 1 watt audio power amplifier description the EUA4890A is an audio power amplifier designed for portable communication device applications such as mobile phone applications. the EUA4890A is capable of delivering 1.0w of continuous average power to an 8 ? btl and with less than 1% distortion (thd+n) from a 5.0v power supply, and 350mw to a 8 ? btl load from a 3v power supply. the EUA4890A provides high quality audio while requiring few external components and minimal power consumption. it features a low-power shutdown mode, which is achieved by driving the pin with logic low. the EUA4890A contains circuitry to prevent from ?pop and click? noise that would otherwise occur during turn-on and turn-off transitions. for maximum flexibility, the EUA4890A provides an externally controlled gain (with resistors), as well as an externally controlled turn-on and turn-off times (with the bypass capacitor). the EUA4890A is available in a 1.5mm ?? 1.5mm wcsp package. features z 2.5-5.5v operation z 65db psrr at 217hz, v dd =5v z 0.1a ultra low current shutdown mode z improved pop & click circuitry z no output coupling capacitors, snubber networks or bootstrap capacitors required z thermal shutdown protection z unity-gain stable z external gain configuration capability z btl output can drive capacitive loads z rohs compliant and 100% lead(pb)-free applications z mobile phones z pdas z portable electronic devices block diagram figure1. shutdown
EUA4890A ds4890a ver 1.2 sep. 2007 2 typical application circuit figure2. audio amplifier with single ?ended input figure3. audio amplifier with differential input
EUA4890A ds4890a ver 1.2 sep. 2007 3 pin configurations package type pin configurations wcsp-9 (top view) pin description pin pin pin i/o description shutdown 1 c3 i the device enters in shutdown mode when a low level is applied on this pin bypass 2 c1 i bypass capacitor pin which provides the common mode voltage +in 3 a3 i positive input of the first amplifier, receives the common mode voltage -in 4 a1 i negative input of the first amplifier, receives the audio input signal. connected to the feedback resistor r f and to the input resistor r in . v o1 5 a2 o negative output of the EUA4890A. connected to the load and to the feedback resistor r f v dd 6 b3 i analog v dd input supply. gnd 7 b1/b2 ground connection for circuitry. v o2 8 c2 o positive output of the EUA4890A.
EUA4890A ds4890a ver 1.2 sep. 2007 4 ordering information order number package type markin g operating temperature range EUA4890Ahir1 wcsp xxx wa -40 c to 85c EUA4890A ?? ?? ?? ?? lead free code 1: lead free 0: lead packing r: tape & reel operating temperature range i: industry standard package type h: wcsp
EUA4890A ds4890a ver 1.2 sep. 2007 5 absolute maximum ratings t supply voltage, v dd -------------------------------------------------------------------------------------------- 6v t input voltage, v i ---------------------------------------------------------------------------- -0.3 v to v dd +0.3v t storage temperature rang, t stg ------------------------------------------------------------------- -65c to 150c t esd susceptibility -------------------------------------------------------------------------------------------- 2kv t junction temperature -------------------------------------------------------------------------------------- 150c t thermal resistance ja (wcsp) -------------------------------------------------------------------------------------------- 81.4c/w electrical characteristics v dd = 5v, t a = 25c EUA4890A symbol parameter conditions min t yp max. unit v in =0v, i o =0a, no load 2.4 5 ma i dd quiescent power supply current v in =0v, i o =0a, 8 ? load 2.5 5 ma i sd shutdown current v shutdown =0v 0.1 2.0 a v sdih shutdown voltage input high 1.2 v v sdil shutdown voltage input low 0.4 v v os output offset voltage 5 25 mv r out-gnd resistor output to gnd 7.0 8.5 9.7 k ? p o output power (8 ? ) thd=1%; f=1khz 1.1 w t wu wake-up time 170 220 ms t sd thermal shutdown temperature 150 170 c thd+n total harmonic distortion + noise p o =0.4 wrms; f=1khz 0.15 % psrr power supply rejection ratio vripple=200mv sine p-p input terminated with 10 ohms to ground 55 65(f=217 hz) 67(f=1kh z) db t sdt shutdown time 8 ? load 1.0 ms
EUA4890A ds4890a ver 1.2 sep. 2007 6 electrical characteristics vdd = 3v, t a = 25c EUA4890A symbol parameter conditions min t yp max. unit v in =0v, i o =0a, no load 1.8 4 ma i dd quiescent power supply current v in =0v, i o =0a, 8 ? load 1.9 4 ma i sd shutdown current v shutdown =0v 0.1 2.0 a v sdih shutdown voltage input high 1.2 v v sdil shutdown voltage input low 0.4 v v os output offset voltage 5 25 mv r out-gnd resistor output to gnd 7.0 8.5 9.7 k ? p o output power (8 ? ) thd=1%; f=1khz 0.28 0.35 w t wu wake-up time 120 180 ms t sd thermal shutdown temperature 150 170 c thd+n total harmonic distortion + noise p o =0.15 wrms; f=1khz 0.15 % psrr power supply rejection ratio vripple=200mv sine p-p input terminated with 10 ohms to ground 45 65(f=217 hz) 66(f=1kh z) db electrical characteristics v dd = 2.6v, t a = 25c EUA4890A symbol parameter conditions min t yp max. unit i dd quiescent power supply current v in =0v, i o =0a, no load 1.7 ma i sd shutdown current v shutdown =0v 0.1 a p o output power (8 ? ) output power (4 ? ) thd=1%; f=1khz thd=1%; f=1khz 0.25 0.32 w thd+n total harmonic distortion + noise p o =0.1wrms; f=1khz 0.15 % psrr power supply rejection ratio vripple=200mv sine p-p input terminated with 10 ohms to ground 55(f=217 hz) 56(f=1kh z) db
EUA4890A ds4890a ver 1.2 sep. 2007 7 typical operating characteristics figure3. figure5. figure7. figure4. figure6. figure8.
EUA4890A ds4890a ver 1.2 sep. 2007 8 figure9. figure11. figure13. figure10. figure12. figure14.
EUA4890A ds4890a ver 1.2 sep. 2007 9 figure15. figure17. figure19. figure16. figue18. figure20.
EUA4890A ds4890a ver 1.2 sep. 2007 10 figure21. figure23. figure25. figure22. figure24. figure26.
EUA4890A ds4890a ver 1.2 sep. 2007 11 figure27. figure29. figure31. figure28. figure30.
EUA4890A ds4890a ver 1.2 sep. 2007 12 application information bridged configuration explanation the structure of the EUA4890A is basically composed of two identical internal power amplifiers; the first one si externally configurable with gain-setting resistors r in and r f (the closed-loop gain is fixed by the ratios of theses resistors) and the second is internally fixed in an inverting unity-gain configuration by two resistors of 20k ? . so the load is driven differentially through outa and outb outputs. this configuration eliminates the need for an output coupling capacitor. the differential-ended amplifier presents two major advantages: - the possible output power is four times larger (the output swing is doubled) as compared to single-ended amplifier under the same conditions. - output pins (outa and outb) are biased at the same potential v dd /2, this eliminates the need for an output coupling capacitor required with a single-ended amplifier configuration. the differential closed loop-gain of the amplifier is given by avd= power dissipation power dissipation is a major concern when designing a successful amplifier, whether the amplifier is bridged or single-ended. a direct consequence of the increased power delivered to the load by a bridge amplifier is an increase in internal power dissipation. since the EUA4890A has two operational amplifiers in one package, the maximum internal power dissipation is 4 times that of a single-ended amplifier. the maximum power dissipation for a given application can be derived from the power dissipation graphs of from equation1. ------------(1) it is critical that the maximum junction temperature t jmax of 150c is not exceeded. t jmax can be determine from the power derating curves by using p dmax and the pc board foil area. by adding additional copper foil, the thermal resistance of the application can be reduced, resulting in higher p dmax. additional copper foil can be added to any of the leads connected to the EUA4890A.if t jmax still exceeds 150c, then additional changes must be made. these changes can include reduced supply voltage, higher load impedance, or reduced ambient temperature. internal power dissipation is a function of output power. proper selection of external components the EUA4890A is unity-gain stable and requires no external components besides gain-setting resistors, and input coupling capacitor and proper bypassing capacitor in the typical application. gain-setting resistor selection (r in and r f ) r in and r f set the closed-loop gain of the amplifier. in order to optimize device and system performance, the EUA4890A should be used in low gain configurations. the low gain configuration minimizes thd + noise values and maximizes the signal to noise ratio, and the amplifier can still be used without running into the bandwidth limitations. low gain configurations require large input signals to obtain a given output power. input signals equal to or greater than 1vrms are available from sources such as audio codecs. a closed loop gain in the range from 2 to 5 is recommended to optimize overall system performance. an input resistor (r in ) value of 20k ? is realistic in most of applications, and does not require the use of a too large capacitor c in . input capacitor selection (c in ) the input coupling capacitor blocks the dc voltage at the amplifier input terminal. this capacitor creates a high-pass filter with r in , the cut-off frequency is given by the size of the capacitor must be large enough to couple in low frequencies without severe attenuation. however a large input coupling capacitor requires more time to reach its quiescent dc voltage (v dd /2) and can increase the turn-on pops. an input capacitor value between 0.1 and 0.39f performs well in many applications (with r in =22k ? ). bypass capacitor selection (c by ) the bypass capacitor c by provides half-supply filtering and determines how fast the EUA4890A turns on. this capacitor is critical component to minimize the turn-on pop. a 1.0f bypass capacitor value (c in = ?? 0.39f) should produce clickless and popless shutdown transitions. the amplifier is still functional with a 0.1f capacitor value but is more susceptible to pop and click noise. thus, a 1.0f bypassing capacitor is recommended. power supply bypassing (c s ) as with any amplifier, proper supply bypassing is critical for low noise performance and high power supply rejection. the capacitor location on both the bypass and power supply pins should be as close to the device is possible. ) r /(2 ) (v * 4 p l dd dmax 2 2 = vinrms vorms in r f r 2 = in c * in *r * 2 1 fc =
EUA4890A ds4890a ver 1.2 sep. 2007 13 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

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