njm2768b -1- headphone amplifier for cd-rom general description package outline the njm2768b is a headphone amplifier designed for cd- rom. it includes 0db closed loop gain and mute circuit, requires few external component. the njm2768b realizes very low turn-noise at mute mode. it is suitable for cd-rom, and other general audio headphone amplifier application. features operating voltage 2.8 to 5.5v operating current 2ma typ. at v + =5v fixed gain 0db typ. stereo headphone output internal mute circuit bipolar technology package outline dmp8 msop8(tvsp8)* *meet jedec mo-187-da / thin type pin configuration 1 2 3 4 8 7 6 5 block diagram 1 2 3 4 8 7 6 5 bias mute pin function 1.out1 2.mute 3.in1 4.gnd 5.in2 6.bias 7.out2 8.v + njm2768brb1 msop8(tvsp8) NJM2768BM (dmp8)
njm2768b -2- absolute maximum ratings (ta=25 c) parameter symbol ratings unit supply voltage v + +7 v power dissipation p d (dmp8) 375 750 (note) (msop8(tvsp8))320 mw operating temperature range topr -40 to +85 c storage temperature range tstg -50 to +150 c (note) at on pc board electrical characteristics (v + =5.0v,vin=0dbv,f=1khz,r l =32 ? ,ta=25 c unless otherwise specified) parameter symbol test conditions min. typ. max. unit operating voltage v + 2.8 5.0 5.5 v operating current i cc no signal - 2.0 4.0 ma reference voltage vref no signal - 2.1 - v closed loop gain g v -1 0 1 db channel balance ? g v -0.5 0 +0.5 db output power p o 1 r l =32 ? , thd=0.1% 30 50 - mw p o 2 r l =16 ? , thd=0.1% 40 100 - mw total harmonic distortion thd - 0.02 0.1 % output noise voltage vno rg=0 ? , a-weighted - -104 (6.3) -94 (20) dbv ( vrms) mute attenuation att vo/vin - -80 -70 db channel separation cs 90 110 - db ripple rejection ratio rr vripple=-20dbv, rg=0 ? - 70 - db input voltage h-level v ih 2.0 - v + v input voltage l-level v il 0.0 - 0.3 v control pin information parameter control signal operating condition mute on l non-signal mute off h output signal
njm2768b -3- ? terminal description pin no. symbol function equivalent circuit terminal voltage 1 7 out1 out2 output1 output2 (v + -1v be )/2 2 mute mute control - 3 5 in1 in2 input1 input2 (v + -1v be )/2 6 bias reference voltage stabiliized capacitor connect terminal (v + -1v be )/2 350k 10ua 50k 50k bia s 50k 50k fb
njm2768b -4- ? typical application 16 ? /32 ? gnd in1 mute out1 out2 mute bias 1 2 8 7 6 5 1 2 3 4 bias in2 v + 1 f 16 ? /32 ? speaker h: speaker active l: speaker mute mute 100 f + v 47 f 1 f 100k ? 100 f speaker
njm2768b -5- ? typical characteristics 0 0.5 1 1.5 2 2.5 3 3.5 4 0123 456 oprating current vs. operating voltage operating current (ma) operating voltage (v) (mute=v+) 0 0.5 1 1.5 2 2.5 3 3.5 4 -40-20 0 20406080100120 operating current vs. ambient temperature operating current (ma) ambient temperature ( o c) v + =5v v + =2.8v 0 0.5 1 1.5 2 2.5 3 0123 456 reference voltage vs. operating voltage reference voltage (v) operating voltage (v) 0 0.5 1 1.5 2 2.5 3 -40-20 0 20406080100120 reference voltage vs. ambient temperature reference voltage (v) ambient temperature ( o c) v + =5v v + =2.8v 0 50 100 150 200 250 300 350 400 0 20406080100120 power dissipation vs.output power power dissipation (mw) output power (mw) thd=10% (v+=5v,f=1khz) rl=32 ? rl=16 ? 0 20 40 60 80 100 120 0 5 10 15 20 25 power dissipation vs.output power power dissipation (mw) output power (mw) thd=10% (v+=2.8v,f=1khz) rl=32 ? rl=16 ? 0 50 100 150 200 250 300 350 400 0 20406080100120 power dissipation vs. output power power dissipation (mw) output power (mw) thd=10% (v+=5v,f=1khz) rl=16 rl=32 0 20 40 60 80 100 120 0 5 10 15 20 25 power dissipation vs. output power power dissipation (mw) output power (mw) thd=10% (v+=2.8v,f=1khz) rl=16 rl=32
njm2768b -6- -100 -90 -80 -70 -60 -50 10 100 1k 10k mute level vs. frequency mute level (db) frequency (hz) (v+=5v,vin=-6dbv,rl=32 ? ) ta=-40 o c ta=25 o c ta=85 o c 0.01 0.1 1 10 0.001 0.01 0.1 thd+n vs. output power thd+n (%) output power (mw) (v+=5v,f=1khz,rl=32 ? ) ta=-40 o c ta=25 o c ta=85 o c 0.01 0.1 1 10 0.001 0.01 0.1 thd+n vs. output power thd+n (%) output power (mw) (v+=5v,f=1khz,rl=16 ? ) ta=85 o c ta=-40 o c ta=25 o c 0.01 0.1 1 10 110100 thd+n vs. output power thd+n (%) output power (mw) (v+=2.8v,f=1khz,rl=32 ? ) ta=-40 o c ta=25 o c ta=85 o c 0.01 0.1 1 10 110100 thd+n vs. output power thd+n (%) output power (mw) (v+=2.8v,f=1khz,rl=16 ? ) ta=85 o c ta=-40 o c ta=25 o c -110 -105 -100 -95 -90 -40 -20 0 20 40 60 80 100 120 output noise voltage vs. ambient temperature output noise voltage (dbv) ambient temperature ( o c) (rl=32 ? ,a-weigthed) v + =5v v + =2.8v
njm2768b -7- [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. 40 50 60 70 80 90 100 110 120 10 100 1000 10 4 channel separation vs. frequency channel separation (db) frequency (hz) (v+=5v,f=1khz,rl=32 ? ) 0 20 40 60 80 100 0.01 0.1 1 10 ripple rejection ratio vs. frequency ripple rejection ratio (db) frequency (hz) (vripple=-20dbv,rl=32 ? ) v + =5v v + =2.8v -100 -80 -60 -40 -20 0 20 00.511.5 voltage gain vs mute control voltage voltage gain (db) mute covtrol voltage (v) (v+=5v,f=1khz,vin=-6dbv) ta=-40 o c ta=25 o c ta=85 o c
mouser electronics authorized distributor click to view pricing, inventory, delivery & lifecycle information: njr: ? NJM2768BM? NJM2768BM-te1? NJM2768BM-te2? njm2768brb1-te2
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