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NJU8790 - 1 - NJU8790 ver.6.1 e pushbutton interface evr with cla ss d stereo power amplifier ? general description ? package outline the NJU8790 is a pushbutton interface electronic volume with class d stereo power amplifie r. it includes input selector, electronic volume, and limiter. the NJU8790 can control the volume and the mode select without the micro-controller by the pushbutton interface. the NJU8790 is suitable for low power consumption and simple control application such as mobile audio player, active speaker and cradle speaker. ? features o operating voltage +2.7 to +5.5v o low operating current 10m a typ. (active mode) 1a max. (stand-by mode) o output power 2.7w+2.7w (v + = 5v, 4ohm, btl) o output filter-less o pop-noise reduction circuit o short-circuit protection circuit o supply voltage monitoring circuit o 2-input 1-output selector (single-end / differential) o pushbutton interface evr 0 to -68db, mute o active filter, limiter o cmos technology o package outline ssop44 (11 x 7.6 x 1.15mm, 0.5mm pitch) ? block diagram input selector 2.7w(4ohm) 1.5w(8ohm) ? stereo class \ d ? amp +12db ? typ. electric volume dn up vddl vddr outlp v + vdd gnd int v + max mid vssl vssr sense power indicator pow swmode volume indicator initial ? vol ? adjuster \ 12, ?\ 16, ?\ 20, ?\ 24 ? db input1/input2 att. ? level ? adjuster \ 10, ?\ 15, ?\ 20, ? mute att v + limiter vref iref v + v + eq2l eq1l outl eq2r eq1r outr volind1 volind2 down up att attadj voladj volinr seloutr selsw volinl seloutl pwind pwsw in1l in1g in1r in2l in2r outln outrp outrn test1 test v + v + v + v + power button v + v + active ? filter active ? filter NJU8790 uvlo vss ? short protection NJU8790v
- 2 - NJU8790 ? pin configuration *)the relations of ?vss= vssl= vssr=0v? a nd ?vdd= vddl=vddr? must be maintained. no. symbol function no. symbol function 1 in1l lch input 1 23 vdd power supply 2 in1g common input 1 24 volind2 volume indicator 2 3 in1r rch input 1 25 volind1 volume indicator 1 4 iref reference current 26 pwind power indicator 5 swmode control mode setting 27 test test 6 att att select switch 28 vddl lch output power supply 7 test1 test 29 outln lch inverted output 8 seloutr selector output r 30 vssl lch output gnd 9 volinr volume input r 31 outlp lch non-inverted output 10 outr volume output rch 32 vddl lch output power supply 11 eq1r active filter1 rch 33 eq2l active filter2 lch 12 eq2r active filter2 rch 34 eq1l active filter1 lch 13 vddr rch output power supply 35 outl volume output l 14 outrp rch non-inverted output 36 volinl volume input l 15 vssr rch output gnd 37 seloutl selector output l 16 outrn rch inverted output 38 sense limiter sensitivity setting 17 vddr rch output power supply 39 int recovery time setting 18 selsw input selector 40 at tadj attenuator adjustor 19 pwsw power on/off 4 1 voladj volume initialization 20 up volume up button 42 in2l lch input 2 21 down volume down button 43 vref reference voltage 22 vss gnd 44 in2r rch input 2 44 23 22 1
- 3 - NJU8790 ? absolute maximum rating (ta=25 c) parameter symbol rating unit power supply voltage v + +7 v p d2 1200 mw power dissipation* 1) p d4 1700 mw maximum input voltage v imax 0 to v + * 2) v operating temperature range topr -40 to +85 c storage temperature range tstg -40 to +125 c load impedance r lmin >3.6 ? * 1) power dissipation eia/jedec standard test board (2layer or 4layer) mounting. the class-d amplifiers operate with high power efficiency and low dissipation power compared to general analog-amplifiers. in theory, the NJU8790 actualize quite high output-power such as 2.7w/channel at 5v operation into 4 ohms load, and total power is supposed to be 5.4w. for this reason, it looks as if the NJU8790 exceeds the absolut e maximum rating of the power dissipation. however, in practice, the effective output-power of usual music sound is only about 1/5 to 1/10 of its maximum output power, thus it may never ex ceed the absolute maximum rating. * 2) don?t apply the input voltage that exceeds supply voltage. ? electrical recommended operating condition (ta=25 c) parameter symbol test condition min. typ. max. unit operating voltage v + 2.7 5.0 5.5 v ? electrical characteristics ? dc characteristics1 (ta=25 c, v + =5.0v, unless otherwise specified) parameter symbol test condition min. typ. max. unit i dd1 no signal, active - 10.0 15.0 ma operating current i dd2 no signal, standby - 0.1 1.0 a reference voltage v ref no signal 1.47 1.67 1.87 v uvlo detecting voltage v dddet 2.0 2.2 2.4 v
- 4 - NJU8790 ? dc characteristics2 (ta=25 c, v + =5.0v, unless otherwise specified) parameter symbol test condition min. typ. max. unit low side output transistor resistance r dsl outlp=0.01v, outln=0.01v outrp=0.01v, outrn=0.01v - 0.4 - ? high side output transistor resistance r dsh outlp=vddl-0.01v, outln=vddl-0.01v outrp=vddr-0.01v, outrn =vddr-0.01v - 0.4 - ? input resistance r in in1l, in1r, in2l, in2r - 100 - k ? class-d amplifier switching frequency f osc 245 320 395 khz class-d amplifier turn-on time t on pwsw :toggle sw mode 180 244 300 ms class-d amplifier turn-off time t off pwsw :toggle sw mode 180 244 300 ms high output voltage v oh i source =1ma (pin 23,24,25) v + *0.8 - v + v low output voltage v ol i sink =1ma (pin 23,24,25)) 0 - v + *0.8 v high input voltage v ih pin 5, pin 6, pin 7, pin 18, pin 19, pin 20,pin 21, pin 27 v + *0.8 - v + v low input voltage v il pin 5, pin 6, pin 7, pin 18, pin 19, pin 20,pin 21, pin 27 0 - v + *0.2 v pull-down resistance r pulldwn pin 19, pin 20,pin 21 - 100 - k ? mode resistance range 1/4 r mode1 pin 40, pin 41 0 - 20 k ? mode resistance range 2/4 r mode2 pin 40, pin 41 40 - 60 k ? mode resistance range 3/4 r mode3 pin 40, pin 41 90 - 110 k ? mode resistance range 4/4 r mode4 pin 40, pin 41 150 - k ? pulse distinction time t jdgpls ? pin 19, pin 20,pin 21 15 20 25 ms auto increment distinction time t jdginc ? pin 19, pin 20,pin 21 0.7 1 1.3 s auto increment cycle t ainc ? pin 19, pin 20,pin 21 117 167 217 ms
- 5 - NJU8790 ? ac characteristics1 (ta=25 c, v + =5.0v, v in =500mvrms, f=1khz, bw=20hz to 20khz, rl=8 ? , vol: 0db, unless otherwise specified) measurement pin: outr(pin10), outl(pin35) parameter symbol test condition min. typ. max. unit maximum input voltage v im vol=-12db thd=1% 1.5 1.7 - vrms maximum gain g vmax -1.0 0 1.0 db initial volume 1 g vinit1 r init = 0 ? -14 -12 -10 db initial volume 2 g vinit2 r init = 47k ? -18 -16 -14 db initial volume 3 g vinit3 r init = 100k ? -22 -20 -18 db initial volume 4 g vinit4 r init = open -26 -24 -22 db maximum attenuate level g vol-68 vol= -68db -70 -68 -66 db mute level mute vol= mute - -90 -84 db att level 1 g vatt1 r att =0 ? -12.0 -10.0 -8.0 db att level 2 g vatt2 r att =47k ? -17.0 -15.0 -13.0 db att level 3 g vatt3 r att =100k ? -22.0 -20.0 -18.0 db att mute level g vatt4 r att =open - -90 -84 db channel balance g cb -1.0 0.0 1.0 db cross talk ct selected input: no signal, rg=0 ? 70 80 - db channel separation cs rg=0 ? 70 80 - db ? ac characteristics2 (ta=25 c, v + =5.0v, v in =500mvrms, f=1khz, bw=20hz to 20khz, rl=8 ? , vol: 0db, unless otherwise specified) measurement pin: outrp-outrn (pin 14-pin16), outlp-outln (pin 31-pin29) parameter symbol test condition min. typ. max. unit output power efficiency e eff thd=10% - 85 - % thd+n thd+n p o =1w - 0.03 - % output power1 po thd+n=10%, r l =8 ? - 1.5 - w/ch output power2 po thd+n=10%, r l =4 ? - 2.7 - w/ch limit level v lim v in =0.7vrms,r sense =56k ? no-load 1.5 2.0 2.5 vrms power amplifier gain av no-load - 12.0 - db output noise voltage 1 v no1 rg=0 ? , a-weighted - -80 (100) - dbv (vrms) output noise voltage 2 v no2 rg=0 ? , a-weighted vol=-68db - -80 (100) - dbv (vrms) ? thd+n ? measurement ? circuit ? NJU8790 aux \ 0025 filters 20khz(aes17) thd meter evaluation board audio ? analyzer lpf ?
- 6 - NJU8790 ? pin description ? swmode (pin 5) and pwsw (pin 19) swmode (pin 5) pwsw(pin 19) function l h system status is changed to active mode and standby mode alternately. l momentary sw mode setting h l no change. h active mode h toggle sw mode setting l standby mode. momentary sw mode data format toggle sw mode data format ? att (pin 6) toggle sw mode pin condition function l attenuator: off h attenuator: on . ? selsw (pin 18) toggle sw mode pin condition function l in1r, in1l signals are selected. h in2r, in2l signals are selected. lo w high mode change [active] mode change [standby] mode change [active] low high mode change [active] mode change [standb y ] mode change [active]
- 7 - NJU8790 ? up (pin 20) pin condition function open(l) h volume setting is increased 1 step. in the cace that ?h? signal inputs more than auto increment distinction time, volume setting is increased continuously. h open(l) no change. * the ?toggle sw mode? does not support. ? down (pin 21) pin condition function open(l) h volume setting is decreased 1 step. in the cace t hat ?h? signal inputs more than auto increment distinction time, volume setting is decreased continuously. h open(l) no change. * the ?toggle sw mode? does not support. ? test (pin 27) pin condition function l normal operation mode h test mode. do not use for normal operation. ? test1 (pin 7) pin condition function l normal operation mode h test mode. do not use for normal operation. ? voladj (pin 41) connected resistance function 0 ? to 20k ? volume initial value: -12db 40 ? to 60k ? volume initial value: -16db 90k ? to 110k ? volume initial value: -20db 150k ? to open volume initial value: -24db ? attadj (pin 40) connected resistance function 0 ? to 20k ? attenuator initial value: -10db 40 ? to 60k ? attenuator initial value: -15db 90k ? to 110k ? attenuator initial value: -20db 150k ? to open mute
- 8 - NJU8790 ? control data ? initial condition (power on) function terminal condition power pin 19 standby volume pin 20, pin 21 -12db, -16db, -20db, -24db ? volume gain step setting step no. volume [db] 0 mute 1 -68 2 -64 3 -60 4 -56 5 -52 6 -48 7 -45 8 -42 9 -39 10 -36 11 -34 12 -32 13 -30 14 -28 15 -26 16 -24 ( *) 17 -22 18 -20 ( *) 19 -18 20 -16 ( *) 21 -14 22 -12 ( *) 23 -10 24 -8 25 -6 26 -5 27 -4 28 -3 29 -2 30 -1 31 0 (*) initial setting
- 9 - NJU8790 ? indicator function ? pwind (pin 26) condition pin voltage class-d amplifier standby l class-d amplifier active h ? volind1 (pin 25) condition pin voltage volume setting is not 0db l volume setting is 0db (max.) h ? volind2 (pin 24) condition pin voltage volume setting is ?26db or lower l volume setting is ?24db or higher h
- 10 - NJU8790 ? timing chart ? pwsw momentary sw mode standby release (standby mode ? active mode) standby (active mode ? standby mode) outrp outrn (pin14, 16) outln, outlp (pin29, 31) pwsw (pin19) outr, outl (pin10, 35) 0v v + /2 pwind (pin26) 32ms low high 20ms (pulse distinction time) low high 0v v + 244ms pwsw (pin19) 0v v + /2 pwind (pin26) 32ms low high 244ms low high outrp outrn (pin14, 16) outln, outlp (pin29, 31) 0v v + 32ms 20ms (pulse distinction time) outr, outl (pin10, 35)
- 11 - NJU8790 ? pwsw toggle sw mode standby release (standby mode ? active mode) standby (active mode ? standby mode) outr, outl (pin10, 35) pwsw (pin19) 0v v + /2 pwind (pin26) 32ms low high low high outrp outrn (pin14, 16) outln, outlp (pin29, 31) 0v v + 32ms 20ms (pulse distinction time) 244ms (class-d amplifier turn-off time) outrp outrn (pin14, 16) outln, outlp (pin29, 31) pwsw (pin19) outr, outl (pin10, 35) 0v v + /2 pwind (pin26) 32ms low high low high 0v v + 20ms (pulse distinction time) 244ms (class-d amplifier turn-on time)
- 12 - NJU8790 ? input selector 20ms outr(pin10) outl(pin35) 0v v + /2 selsw (pin18) 32ms low high 64ms 32ms input 1 ? input 2
- 13 - NJU8790 ? volume up/down control 1. recognition condition of volume up/down push button i/f 1-a.) the volume up/(down) recognizes the data-command to the case that the down(up) button has not been pushed, besides that the up(down) button is pushed for the longer time than the ?pulse distinction time: 20ms". 1-b.) the volume up/(down) re cognizes the data-command to the case that the up(down) button has pushed earlier than the down(up) button, besides th e up(down) button is pushed for the longer time than the ?pulse distinction time: 20ms". 2. invalidity condition of volume up/down push button i/f 2-a.) the volume up/(down) does not recognize the data-command to the case that the up(down) button has pushed for the shorter time than the ?pulse distinction time: 20ms". (the chattering prevention function operates.) 2-b.) the volume up/(down) does not recognize the data-command to the case that the up(down) button has pushed for the shorter time than the ?pulse distinction time: 20ms" after released button. (the chattering prevention function operates.) 2-c.) the volume up/(down) does not recognize the data-command to the case that the up(down) button has pushed before releasing down(up) button. up down 1-a > pulse distinction time (20ms typ.) recognition up down 1-b > pulse distinction time (20ms typ.) recognition up down 2-c up down 2-a < pulse distinction time (20ms typ.) up down 2-b < pulse distinction time (20ms typ.)
- 14 - NJU8790 3. start condition of volume up/down auto increment function 3-a.) the auto increment of volume up(down) is started to the case that the down(up) button has not been pushed, besides that the up(down) button is pushed for the longer time than the ?auto increment distinction time: 1s". 4. stop condition of volume up/down auto increment function 4-a.) the auto increment of volume up(down) is stopped to the case that the up(down) button has released for the longer time than the ?pulse distinction time: 20ms" for the auto increment period. 4-b.) the auto increment of volume up(down) is stopped to the case that the down(up) button has pushed for the auto increment period. up down 4-a auto increment distinction time (1s typ.) increment start increment stop pulse distinction time (20ms typ.) up down 4-b increment start auto increment distinction time (1s typ.) increment stop up ? down ? 3 \ a > auto increment distinction time ? (1s ? typ.) auto increment starts auto increment cycle ? outr(pin10) ? outl(pin35) ?
- 15 - NJU8790 ? application circuit input selector 2.7w(4ohm) 1.5w(8ohm) ? stereo class \ d ? amp +12db ? typ. electric volume dn up vddl vddr outlp v + vdd gnd int v + max mid vssl vssr sense power indicator pow swmode volume indicator input1/input2 att v + limiter vref iref v + eq2l eq1l outl eq2r eq1r outr volind1 volind2 down up att attadj voladj volinr seloutr selsw volinl seloutl pwind pwsw in1l in1g in1r in2l in2r outln outrp outrn test1 test v + v + v + v + power button v + v + NJU8790 uvlo vss ? short protection sound ic c1=0.47 f c2=1 f c3=0.47 f c11=0.47 f c9=0.47 f c5=0.47 f c4=4.7 f r3=9.1k r4=10k r8=9.1k r9=10k c14 =0.47 f c13=4.7 f c18=0.1 f c10=1 f r2=100k c6=100pf c15=100pf c12=1 f r7=56k c7=0.1 f c8=4.7 f v + c16=0.1 f c17=4.7 f r5=0 to open r6=0 to open r10 r11 r12 r13 r14 r15 q3 q2 q1 [caution] the specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.

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