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monaural speaker/stereo headphone power amplifier overview the LA4820M compound power ic is designed for portable information processing equipment, such as electronic book players and personal notebook computers, and provides on chip headphone stereo amplifier and monaural speaker amplifier functions required of such devices. this system ic also provides on chip a power-saving headphone jack plug-in/out detection function, which automatically switches the amplifiers, and an optimum volume level controller. features c power-saving headphone jack plug-in/out detection function on chip that electronically switches between the stereo headphone amplifier and the monaural btl amplifier according to jack plug-in/out. c the monaural amplifier has, as output control functions, a built-in output limiter that permits adjustment in accordance with the speaker impedance and a non-clipping circuit that outputs a sine wave suited to the output d range, while the headphone amplifier has a built-in user-friendly pvss (peak volume select system). c on-chip ripple filter with a high ripple rejection ratio in order to reduce power line noise. c less external components needed thanks to system and circuit technology, and low-capacitance design (22 f or less) allowing support for chip components. functions c monaural btl power amplifier c headphone ocl power amplifier (16 w ) 2 c output control functions: headphone power pvss monaural power non-clipping circuit and output limiter c headphone jack plug-in/out detection function (monaural amplifier/headphone amplifier switching) c ripple filter c power mute switch c common amplifier on/off switching package dimensions unit : mm 3112-mfp24s [LA4820M] sanyo : mfp24s sanyo recommended board independent ic allowable power dissipation, pd max ? mw ambient temperature, ta ? c ordering number: en5205a monolithic linear ic LA4820M sanyo electric co.,ltd. semiconductor bussiness headquarters tokyo office tokyo bldg., 1-10, 1 chome, ueno, taito-ku, tokyo, 110 japan 22896ha(ii) no.5205-1/20
specifications maximum ratings atta=25 c parameter symbol conditions ratings unit maximum supply voltage v cc 1,2 max 8.0 v allowable power dissipation pd max 580 mw with sanyo evaluation board (84.2 92.6 mm 2 ) 1.1 w operating temperature topr 20 to +75 c storage temperature tstg 40 to +150 c operating conditions atta=25 c parameter symbol conditions ratings unit recommended supply voltage v cc 1 6.0 v operating voltage range v cc 1 op 2.5 to 7.2 v v cc 2 op 2.0 to 7.2 v operating characteristics atta=25 c, v cc 1 = 6.0 v, fi = 1 khz, 0.775 v = 0 dbm, r l =16 w : monaural amplifier, r l =16 w : headphone amplifier parameter symbol conditions min typ max unit [total] quiescent current i cco 1 rg=0k w , monaural amplifier 7.0 11.5 21.0 ma i cco 2 rg=0k w , headphone amplifier 5.5 9.0 14.0 ma i cco 3 headphone common amplifier off 4.0 6.3 10.0 ma input resistance ri 10 13 16 k w [monaural amplifier] output power p o 1 thd = 10%, pin 12 connected to gnd 500 760 mw voltage gain (closed) vg1 v o = 0 dbm 36.0 39.0 42.0 db total harmonic distortion thd1 p o = 100 mw 0.1 1.0 % output noise voltage v no 1 rg=0 w , bpf = 20 to 20 khz 170 300 v ripple rejection ratio rr1 rg = 0 w , vr = ?10 dbm, fr = 100 hz 60 77 db dc offset voltage v off 1 between pin 19 and pin 21 80 0 +80 mv [non-clipping + monaural amplifier] output power p o 2 vi = 0 dbm 300 450 mw total harmonic distortion thd2 v i = 0 dbm 1.2 2.0 % [output limiter + monaural amplifier] output power p o 3 vi = 0 dbm, output limiter input resistance 220 w 120 200 300 mw total harmonic distortion thd3 v i = 0 dbm, output limiter input resistance 220 w 0.5 1.2 % [headphone amplifier] output power p o 4 thd = 10% 30 120 mw voltage gain (closed) vg2 v o = 10 dbm 15.3 18.3 21.3 db total harmonic distortion thd4 p o = 1 mw 0.1 0.5 % interchannel crosstalk ct vo = 5 dbm, rg = 0 w 30 39 db output noise voltage v no 2 rg=0 w , bpf = 20 to 20 khz 16 35 v ripple rejection ratio rr2 rg = 0 w , vr = ?10 dbm, fr = 100 hz 70 92 db dc offset voltage v off 2 between pin 15 and pin 16, and pin 16 and pin 17 40 0 +40 mv [pvss + headphone amplifier] pvss voltage v o vi = 30 dbm, pvss2 39 36 33 dbm pvss distortion factor thd5 vi = 30 dbm, pvss2 0.25 1.6 % pvss start input v opi pvss2 59 55 51 dbm pvss width w pvss input width from the starting point to the point where the output is +4 db, pvss on 28 35 db [ripple filter] output voltage v rf i rf = 300 ma, 2sb1295 h fe 6 used 5.30 5.49 5.70 v ripple rejection ratio rr3 vr = 10 dbm, fr = 100 hz, i rf = 300 ma, 2sb1295 h fe 6 used 30 34 db LA4820M no.5205-2/20
block diagram LA4820M no.5205-3/20
test circuit diagram LA4820M no.5205-4/20
sample application circuit 1 *1 a tantalum capacitor is recommended. *2 a polyester film or ceramic capacitor (of which capacitance specified must be independent of temperature changes) is recommended. LA4820M no.5205-5/20
sample application circuit 2 (when neither ripple filter nor common amplifier is used.) *1 a tantalum capacitor is recommended. LA4820M no.5205-6/20
pin description * when the pin voltage is for v cc 1 = 6.0 v pin no. pin name pin voltage [v] internal equivalent circuit remarks 1 r.f ref (ripple filter) 5.5 c lpf pin for ripple filter reference bias. c ripple rejection ratio can be adjusted through an external capacitor. c open when no ripple filter is needed. 2 pwr mute 1.2 c power mute is turned on when pin 2 is pulled down. c turns on and off supply of constant current to the power block. 3 mono in 2.8 c btl power input pin. c input resistance 9 k w . 4 mix out 2.8 c in1 and in2 addition output pin. c output resistance 5 k w . 5 6 in1 in2 2.8 c power input pins. c input resistance can be varied between 14 k w and 4k w by alc. continued on next page. LA4820M no.5205-7/20
continued from preceding page. pin no. pin name pin voltage internal equivalent circuit remarks 7 pre gnd c connects small-signal block to gnd. 8v ref 2.8 v ref c virtual ground bias pin. c impedance is lowered by v ref amplifier. (ro = 10 w or less) c v ref voltage is determined by the following formula: v ref = v cc 2 voltage (pin 22) 2 (v) 9v ref ref 2.8 c lpf pin for v ref amplifier reference bias. 10 ref 5.1 c lpf pin for internal ripple filter reference bias. c voltage of v cc 2 ? 0.4 v. 11 pwrc cont 0.8 c h z p power is such that the common amplifier turns off and the output common capacitor mode is entered when pin 11 is pulled down. 12 det out 0.5 to 1.0 c pvss, output limiter, non-clipping circuit alc rectification pin. c the attack and recovery time are determined by the external capacitance and resistance. continued on next page. LA4820M no.5205-8/20
continued from preceding page. pin no. pin name pin voltage internal equivalent circuit remarks 13 pvss in 2.8 c pvss detection input pin. c pvss turns off when pulled down or left open. 14 mono/h z p cont 0.6 c switches to h z p when pin 14 is pulled down (connected to gnd through 1 m w ). c the external capacitance and resistance is for mode switching smoothing. 15 17 out2 out1 2.3 c h z p power output pin. 16 outc 2.3 c h z p power common pin. c turns off when pin 11 is pulled down. 18 pwr gnd c connects power amplifier output block to gnd. continued on next page. LA4820M no.5205-9/20
continued from preceding page pin no. pin name pin voltage internal equivalent circuit remarks 19 21 out? out+ 2.3 c mono power output pin. c btl operation provides phase inversion and amplitude. 20 level det in 2.9 c mono power output level detection input pin. c output limiter level can be varied by external resistance. 22 v cc 2 5.5 inside ic c ripple filter output pin. c power supply pin when no ripple filter is used. c amplifier block v cc pin. 23 base 5.4 c tr base grounding pin for ripple filter. c left open when no ripple filter is needed. 24 v cc 1 6.0 c ripple filter v cc pin. c left open when no ripple filter is needed. LA4820M no.5205-10/20
sanyo evaluation board pattern unit (resistance: w , capacitance: f) surface (silk side) tone block (copper foiled side) copper foiled side LA4820M no.5205-11/20
description of external components (refer to sample application circuit no. 1 for device numbers.) c r1 ( to 40 k w ): resistor for ripple filter reference bias. not needed when no ripple filter is used. resistance v cc 1?v cc 2 none 1.17 v 150 k w 0.73 v 75 k w 0.52 v 40 k w 0.35 v the v ce voltage (v cc 1?v cc 2) of the tr can be adjusted by changing the resistance value. c r2 (270 k w to 100 k w ): resistor for smoothing (shock noise prevention) when power mute is turned on. c r3, r4 (30 k w to 10 k w ): volume. c r5 (5.1 m w to 510 k w ): resistor for pvss, output limiter, and non-clipping circuit recovery. c r6 (510 k w to 0 w ): pvss output level variable resistor. not needed when using no pvss. resistance pvss v o none ?36 dbm 100 k w t25 dbm 300 k w t18 dbm c r7 (1 m w ): pull-down (discharging) resistor for sp/h z p switching. c r8 (270 k w ): pull-up (charging) resistor for sp/h z p switching. c r9, r10 (510 k w to 10 k w ): h z p output mixing resistors for pvss. not needed when using no pvss. c r11 (2.2 w ): resistor for blocking common amplifier oscillation. not needed when the common amplifier is turned off. c r12 (510 k w to 0 w ): output limiter level variable resistor. not needed when no output limiter is used. resistance p o 400 k w 400 mw 300 k w 290 mw 220 k w 200 mw 100 k w 110 mw 043mw the limiter level can be adjusted by changing the resistance value. c q1: ripple filter output tr (2sb1295 h fe 6 recommended). not needed when using no ripple filter. c c1 (4.7 f to 1.0 f): lpf capacitor for the ripple filter reference bias. low-region ripple rejection ratio can be varied by changing the capacitance. not needed when using no ripple filter. capacitance 100 hz svrr 1 khz svrr 4.7 f 40 db 60 db 2.2 f 34 db 54 db 1.0 f 28 db 48 db c c2 (0.1 f to 0.01 f): capacitor for smoothing (shock noise prevention) when power mute is turned off. c c3 (3.3 f to 0.22 f): coupling capacitor for the mix amplifier output and the btl amplifier input. c c4 (100 f to 0.1 f): decoupling capacitor for virtual grounding and high-region noise cleaning. c c5 (4.7 f to 1.0 f): lpf pin for v ref amplifier reference bias. ripple rejection ratio can be varied by changing the capacitance. c c6 (22 f to 3.3 f): lpf capacitor for internal ripple filter reference bias. ripple rejection ratio can be varied by changing the capacitance. c c7 (33 f to 10 f): alc rectifying capacitor for pvss, output limiter and non-clipping circuit. LA4820M no.5205-12/20
c c8 (0.33 f to 0.1 f): coupling capacitor for pvss detection input and h z p power output. not needed when pvss is not used. c c9 (0.1 f to 0.01 f): capacitor for sp/h z p switching smoothing (charging/discharging). c c10 (0.47 f to 2.2 f): capacitor for blocking common amplifier oscillation. polyester film or ceramic capacitor (of which capacitance specified must be independent of temperature changes) is recommended. not needed when common amplifier is turned off. c c11 (22 f to 47 f): ripple filter output capacitor. also functions as oscillation blocking capacitor. c c12 (220 f to 10 f): power supply capacitor. * use of a tantalum capacitor is recommended for c11 and c12, because electrolytic capacitors cause the high-region impedance to increase at low temperatures. description of each system 1. ripple filter c used when the ripple level on the power line is high and a high ripple rejection ratio is needed in the amplifier block. when not needed, pins 1, 23 and 24 must be left open. (refer to sample application circuit 2.) c when using a ripple filter, the output tr v ce voltage and the pin 1 c1 capacitance (lpf capacitor for the reference bias) must be adjusted according to the power supply ripple level. power supply
c an equivalent circuit for the mute circuit is shown on the previous page. if the power supply is turned on, the external capacitor is charged by the internal constant current; once the voltage reaches 0.75 v (the switching level), mute turns off and the pin 2 dc voltage stabilizes at approximately 1.2 v. to turn mute on, short through a resistor to pull down pin 2. in this way, smoothing is applied by using an external capacitor and resistor to prevent switching noise when mute is turned on/off. c the mute-on/off time during normal operation is as shown below. 2. common amplifier control switch c when the headphone output is connected to other equipment, in an application set in which the common amplifier output (jack common pin) may be connected to gnd causing overcurrent to flow from the common amplifier, it is necessary to turn off the common amplifier. in such an application, it is recommended to use the common capacitor scheme shown in sample application circuit 2 where pin 11 is grounded to turn off the common amplifier. c an equivalent circuit for the switching circuit is shown below. c pwrc-off condition v s11 % 0.4 v 3. h z p/sp switch c this circuit uses a headphone jack with a switch to detect the headphone plug-in/out and automatically switch between the h z p amplifier and the mono amplifier. when the h z p amplifier is operating, the mono amplifier is turned off, and when the mono amplifier is operating, the h z p amplifier is turned off. c smoothing is applied by using an external capacitor and resistor in order to prevent switching shock noise. c open h z p condition v s14 % 0.2 v mute-off time 6 8ms mute on pin 2 discharging mute-on time 6 9ms when 270 k w and 0.033 f are used: mute off pin 2 charging to LA4820M no.5205-14/20
quiescent current, i cco tma supply voltage, v cc 1tv v dc tv supply voltage, v cc 1tv voltage gain, vg t db frequency, fi t hz voltage gain, vg t db supply voltage, v cc 1tv total harmonic distortion, thd t % frequency, fi t hz without bpf total harmonic distortion, thd t % supply voltage, v cc 1tv total harmonic distortion, thd t % output power, po t mw crosstalk, ct t db frequency, fi t hz v cc 2 pin 22 vr.f pin 10 v ref pin 8 bpf 400 to 30 khz output dc pins 5 to 17 pins 19 and 21 to LA4820M no.5205-15/20
crosstalk, ct t db supply voltage, v cc 1tv output power, p o tmw supply voltage, v cc 1tv current dissipation, i cc tma output power, p o tmw output on both channels power dissipation, pd t w output noise voltage, v no tv supply voltage, v cc 1tv ripple rejection ratio, svrr t db supply voltage, v cc 1, v cc 2tv tune used ripple rejection ratio, svrr t db frequency, f r thz output voltage, v o t dbm vi t dbm total harmonic distortion, thd t % output voltage, v o t dbm frequency, fi t hz depending on the impedance of coupling capacitor 0.22 f. used bpf = 400 to 30 khz LA4820M no.5205-16/20
output voltage, v o ? dbm supply voltage, v cc 1?v total harmonic distortion, thd ? % voltage gain, vg ? db frequency, fi ? hz voltage gain, vg ? db supply voltage, v cc 1?v upper clipping total harmonic distortion, thd ? % frequency, fi ? hz total harmonic distortion, thd ? % supply voltage, v cc 1?v total harmonic distortion, thd ? % output power, p o ?mv crosstalk, ct ? db frequency, fi ? hz crosstalk, ct ? db supply voltage, v cc 1?v less upper d range bpf 400 to 80 khz in bpf = 400 to 30 khz 10 khz 1 khz LA4820M no.5205-17/20
output power, p o ?mw supply voltage, v cc 1?v current dissipation, i cc ?ma current dissipation, pd ? w output power, p o ?mw output on both channels output noise voltage, v no ?v supply voltage, v cc 1?v ripple rejection ratio, svrr ? db supply voltage, v cc 1,2?v used ripple rejection ratio, svrr ? db frequency, f r ?hz used voltage gain, vg ? db frequency, fi ? hz voltage gain, vg ? db supply voltage, v cc 1?v total harmonic distortion, thd ? % output power, p o ?mw LA4820M no.5205-18/20
total harmonic distortion, thd ? % frequency, fi ? hz output voltage, p o ?mw non-clipping output limiter output noise voltage, v no ?v supply voltage, v cc 1?v supply voltage, v cc 1?v ripple rejection ratio, svrr ? db supply voltage, v cc 1,2?v ripple rejection ratio, svrr ? db frequency, f r ?hz used supply current, i cc 1?ma output power, p o ?mw power dissipation, pd ? w output voltage, v o ? dbm vi ? dbm non-clipping output limiter open non-clipping output limiter total harmonic distortion, thd ? % output power, p o ?mw supply voltage, v cc 1?v total harmonic distortion, thd ? % non-clipping output limiter non- clipping output limiter pin 12 gnd bpf = 400 to 30 khz bpf = 400 to 30 khz LA4820M no.5205-19/20

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