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NJU72010 ? 1 ? ver.2.4e 2vrms ground referenced stereo line amplifier with lpf ! general description the NJU72010 is an audio line amplifier . it can swing 2vrms (5.6v peak-to-peak) signal at 3.3v operating voltage. ground-referenced outputs eliminate output coupling capacitor. the pop noise suppression circuit removes a pop noise at the power-on and power-off. it is suitable for audio line interface of audio equipment which does not have over 9v regulator. ! applications audio applications requiring 2vrms outputs ! features operating voltage +2.7 to +3.6v operating current i dd =5ma typ. at v + =3.3v, r l =47k ? , no signal output coupling capacitor-less pop noise suppression circuit lpf c-mos technology package outline msop10 (tvsp10)* ssop14 *meet jedec mo-187-da / thin type ! block diagram ! ! ! ! package outline NJU72010rb2 msop10 (tvsp10) NJU72010v (ssop14) inl inr outl outr pop no is e suppression mu te tr mu te tr v + bias charge pump gnd cp cn v - mute
NJU72010 ? 2 ? ! pin configuration msop10(tvsp10) ssop14 no. symbol function 1 inl lch input 2 outl lch output 3 v+ v+ power supply 4 cp flying capacitor positive terminal 5 cn flying capacitor negative terminal 6 v- v- power supply 7 mute mute / pop noise suppression 8 gnd ground 9 outr rch output 10 inr rch input no. symbol function 1 nc nc 2 inl lch input 3 outl lch output 4 v+ v+ power supply 5 cp flying capacitor positive terminal 6 cn flying capacitor negative terminal 7 nc nc 8 nc nc 9 v- v- power supply 10 mute mute / pop noise suppression 11 gnd ground 12 outr rch output 13 inr rch input 14 nc nc 110 6 5 114 8 7
NJU72010 ? 3 ? ! absolute maximum rating (ta=25 c) parameter symbol rating unit supply voltage v + +4 v power dissipation p d msop10(tvsp10) : 530 (note1) ssop14 : 550 (note1) mw maximum input voltage v imax -v + -0.3 ~ v + +0.3 v operating temperature range topr -40 ~ +85 c storage temperature range tstg -40 ~ + 125 c (note1) eia/jedec standard test board (76.2x114.3x1.6mm, 2layer, fr-4) mounting ! ! ! ! recommended operating conditions (ta=25 c unless otherwise specified ) parameter symbol test condition min. typ. max. unit operating voltage v + 2.7 3.3 3.6 v ! ! ! ! electrical characteristics (ta=25 c, v + =3.3v, f=1khz, vin=1vrms, mute=off, r l =47k ? unless otherwise specified ) parameter symbol test condition min. typ. max. unit operating current i dd no signal - 5 10 ma output gain g v 5.2 6.2 7.2 db output gain error ? g v -0.5 0 0.5 db maximum output voltage level v omax thd=1% - 2.3 - vrms mute level v mute mute=on, bw:400hz-22khz - -110 - db equivalent input noise voltage v no rg=0 ? , bw:400hz-22khz - -106 - db total harmonic distortion thd bw:400hz-22khz - 0.003 - % channel separation cs rg=600 ? 80 - - db cut-off frequency f c 2 nd order lpf 100 150 200 khz output offset voltage v os rg=0 ? - 1 5 mv power supply rejection ratio psrr vripple=1khz / 100mvrms - 45 - db output impedance r out - 300 - ? ! ! ! ! control characteristics (ta=25 c, v + =3.3v, r l =47k ? unless otherwise specified ) parameter symbol test condition min. typ. max. unit mute terminal high muteh mute=off 0.8v + - v + v mute terminal low mutel mute=on 0 - 0.2v + v
NJU72010 ? 4 ? ! ! ! ! test circuit (i dd ) ! ! ! ! test circuit (g v , v omax , thd) mut e- tr mut e- tr 1uf 10uf v + 1uf charge pu mp 2 bias inl outl v+ cp cn inr outr gnd mute 1uf 10uf 3 4 5 1 9 8 7 6 10 v- pop noise suppression c2 c11 c4 c6 c8 v v v + 47k ? 47k ? mut e- tr mut e- tr 1uf v + charge pu mp 2 bias inl outl v+ cp cn inr outr gnd mute 10uf 3 4 5 1 9 8 7 6 10 v- po p no is e suppression c4 c6 v + a 1uf c2 1uf c8
NJU72010 ? 5 ? ! ! ! ! test circuit (v mute ) ! ! ! ! test circuit ( v no ) v no =(measurement)-gv1 mut e- tr mut e- tr 1uf 10uf v + 1uf charge pu mp 2 bias inl outl v+ cp cn inr outr gnd mute 1uf 10uf 3 4 5 1 9 8 7 6 10 v- pop noise suppression c2 c11 c4 c6 c8 v v 47k ? 47k ? mut e- tr mut e- tr 1uf 10uf v + 1uf charge pu mp 2 bias inl outl v+ cp cn inr outr gnd mute 1uf 10uf 3 4 5 1 9 8 7 6 10 v- pop noise suppression c2 c11 c4 c6 c8 v v 47k ? 47k ? v +
NJU72010 ? 6 ? ! ! ! ! test circuit (cs) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ! ! ! ! test circuit (f c ) mut e- tr mut e- tr 1uf 10uf v + 1uf charge pu mp 2 bias inl outl v+ cp cn inr outr gnd mute 1uf 10uf 3 4 5 1 9 8 7 6 10 v- pop noise suppression c2 c11 c4 c6 c7 c8 v 47k ? 47k ? v + rg=600 ? mut e- tr mut e- tr 1uf 10uf v + 1uf 1k ? 820pf charge pu mp 2 bias inl outl v+ cp cn inr outr gnd mute 1uf 1k ? 820pf 10uf 3 4 5 1 9 8 7 6 10 v- pop noise suppression v r l =47k ? r l =47k ? v + c2 r1 c3 c11 c4 c6 c9 c8 r3 v
NJU72010 ? 7 ? ! ! ! ! test circuit (v os ) ! ! ! ! test circuit (psrr) vripple=1khz / 100mvrms mut e- tr mut e- tr 1uf 10uf v + 1uf charge pu mp 2 bias inl outl v+ cp cn inr outr gnd mute 1uf 10uf 3 4 5 1 9 8 7 6 10 v- pop noise suppression c2 c11 c4 c6 c7 c8 v v v + mut e- tr mut e- tr 1uf 10uf vripple 1uf charge pu mp 2 bias inl outl v+ cp cn inr outr gnd mute 1uf 10uf 3 4 5 1 9 8 7 6 10 v- po p no is e suppression c2 c11 c4 c6 c8 v v 47k ? 47k ? v + v +
NJU72010 ? 8 ? ! application circuit 2 nd order lpf mut e - tr mu t e- tr 1uf + 10uf v + 1uf 1k ? 820pf char ge pump 2 bias inl outl v+ cp cn inr outr gnd mute + 1uf 1k ? 820pf 10uf 4.7uf 22k ? 3 4 5 1 9 8 7 6 10 v- pop no is e suppression
NJU72010 ? 9 ? ! application note the NJU72010 is an audio line amplifier that eliminates the need for external dc-blocking output capacitors. the NJU72010 has built-in pop suppression circuitry to eliminate disturbing pop noise during power-on, power-off and mute-control. 1. operating principle the NJU72010 has the built-in non-inverted input operational amplifiers, voltage inverter, and pop noise suppression circuitry (fig.1). the voltage inverter for the NJU72010 eliminates the need for external dc-blocking output capacitors. the pop suppression circuitry for the NJU72010 eliminates the pop noise during power-on, power-off and mute-control. ? ? ? ? ? ? ? ? ? ? ? ? fig.1 the NJU72010 functional block diagram 1.1 external parts 1.1.1 input coupling capacitors c i (c2, c8) the input coupling capacitor (c i ) and the total of the external resistance (r1, r3) and the input resistance (r in =218k ? typ.) for the non-inverted terminal form a high-pass filter with the corner frequency determined in [fc=1/(2 x (r1+218k ?) x c i )). it is necessary to adjust 1uf or more. mu t e- tr mut e - tr 1uf + 10uf v + 1uf 1k ? 820pf char ge pu mp 2 bias inl outl v+ cp cn inr outr gnd mute 1uf 1k ? 820pf 10uf 4.7uf 22k ? 3 4 5 1 9 8 7 6 10 v- po p no is e suppression + r1 c2 c3 c11 c4 c6 c7 r2 c9 r3 c8
NJU72010 ? 10 ? 1.1.2 flying capacitor (c4) use capacitors with a low-esr (ex. ceramic capacitors) for optimum performance. design to provide low impedance for the wiring between cp terminal (4pin), cn terminal (5pin), and the flying capacitor (c4). fig.2 the nju72040 block diagram (4pin, 5pin) 1.1.3 hold capacitor (c6) use capacitors with a low-esr (ex. ceramic capacitors) for optimum performance. design to provide low impedance for the wiring between the hold capacitor (c6), v- terminal (6pin) and the gnd on the pcb. separate the gnd pattern connecting to the hold capacitor (c6) from that connecting to the gnd terminal (8pin), thus suppressing the influence of switching noise by removing the common impedance of the gnd wiring. design no short-circuits of v- terminal (6pin) and v+ terminal (3pin) on the pcb pattern. fig.3 the NJU72010 block diagram (6pin, 8pin) 1.1.4 mute terminal pop noise countermeasures (r2, c7) mute terminal needs time constant more than r2 x c7=0.1. it is necessary to adjust 22k ? or less. fig.4 the NJU72010 block diagram (7pin) cp(4pin) cn(5pin) c4=1uf c6 v-(6pin) gnd(8pin) 400k ? mute(7pin) r2=22k ? c7=4.7uf vcnt
NJU72010 ? 11 ? 1.2 control of v+ terminal and mute terminal 1.2.2 power-on procedure 1. turn on the v+. 2. after 100msec from power on, change the control voltage of mute terminal (vcnt) from "low" to "high". * it is necessary to stabilize an ic for 100msec. by releasing the mute function, the output terminal output the signal. 1.2.3 power-off procedure 1. change the control voltage of mute terminal (vcnt) from "high" to "low". by the mute function, the output signals are stopped from output terminal. 2. turn off the v+ after ?2rc? sec from mute. * it is necessary to stabilize a mute condition for ?2rc? sec. ex.) r2=22k ? , c7=4.7uf -> 2r2 x c7=200msec fig.5 power-on / power-off timing chart 100msec 200msec t t t v + (3 p in v cnt mut (7 p in) mute mute mute
NJU72010 ? 12 ? ! terminal description terminal symbol function equivalent circuit voltage 1 10 inl inr ac input 0v 2 9 outl outr ac output 0v 3 v+ supply voltage v+ 4 cp flying capacitor positive terminal - v- v+ v- v+ gnd 18k ? 30pf 200k ? v+ v- gnd 1k ? 100 ? v- gnd vdd 8.68k ? 7k ? 1k ? 200 ?
NJU72010 ? 13 ? ! terminal description terminal symbol function equivalent circuit voltage 5 cn flying capacitor negative terminal - 6 v- v- voltage -[v+] 7 mute mute/pop noise suppression 0v v- v+ v+ v- gnd 100 ? v- v+ 400k ? gnd
NJU72010 ? 14 ? ! typical characteristics maximum output voltage vs frequency v + =3.3v, thd=1%, r l =47kohm, i/o: inl-outl 1.0 1.5 2.0 2.5 3.0 10 100 1000 10000 100000 frequency [hz] maximum output voltage [vrms ] -40 o c 25, 85 o c supply current vs supply voltage no signal 0 2 4 6 8 01234 supply voltage [v] supply current [ma] 85 o c -40 o c 25 o c maxium output voltage vs load resistance v + =3.3v, f=1khz ,i/o: inl-outl 1.0 1.5 2.0 2.5 3.0 1000 10000 100000 r l [ ? ] maximum output voltage [vrms ] -40 o c 25, 85 o c maximum output voltage vs supply voltage thd=1% , r l =47kohm, i/o: inl-outl 1.0 1.5 2.0 2.5 3.0 2.5 3.0 3.5 4.0 supply voltage [v] maximum output voltage [vrms ] -40, 25, 85 o c t hd+n vs ou t p u t v o lt ag e v + =3.3v, ta=25 o c, r l =47kohm, i/o: inl-outl bw:10-22khz (f=100hz), 400-22khz (f=1k,10khz) 0.001 0.01 0.1 1 0.1 1 10 output voltage [vrms] thd+n [% ] 100hz 10khz 1khz gain vs frequency v + =3.3v, vout=2vrms, r l =47kohm, i/o: inl-outl 2nd order lpf 3 4 5 6 7 8 9 10 10 100 1000 10000 100000 1000000 frequency [hz] gain [db] NJU72010 nju72011
NJU72010 ? 15 ? ! typical characteristics channel separation vs frequency v * =3.3v, rl=47kohm, vout=2vrms, i/o:inl-outr filter=bandpass -120 -100 -80 -60 -40 10 100 1000 10000 100000 frequency [hz] channel separation[db] 25, 85 o c -40 o c thd+n vs frequency v + =3.3v, r l =47kohm, vout=2vrms, i/o: inl-outl bw:10-80khz 0.001 0.01 0.1 1 10 100 1000 10000 100000 frequency [hz] thd+n [% ] 85 o c -40 o c 25 o c psrr vs. frequency v + =3.3v, vripple=100mvrms, f=1khz, filter=bandpass -80 -70 -60 -50 -40 -30 -20 10 100 1000 10000 100000 frequency [ hz ] psrr [ db ] 85 o c -40,25 o c mute control voltage vs. mute level v + =3.3v, vout=2vrms, f=1khz, filter=bandpass -120 -100 -80 -60 -40 -20 0 20 01234 mute control voltage [ v ] mute level [ db ] 85 o c -40,25 o c [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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