NJM2708 ? 1 ? ver.0.1e sound enhancement audio processor for compression audio general description package outline the NJM2708 is a sound enhancement audio processor designed for compression audio. it includes mode control switch (sound enhancement mode / bypass mode), standby function and realizes low consumption power design by standby function. it is suitable for portable audio, car audio & home audio applications. features operating voltage +1.8 to +13 v low operating circuit 0.75 ma typ.(at sound enhancement mode vr: max.) 0.1a typ. (at standby mode) low output noise -100dbv typ.(at sound enhancement mode vr: max.) low thd 0.005% typ. variable surround effect by external resistor standby function internal mode control switch bipolar technology package outline ssop14 pin configuration (ssop14) NJM2708v 1. standby sw 2. lin 3. rin 4. mode sw 5. vref 6. gnd 7. nc 8. dnc 9. v+ 10. nfr 11. nfl 12. rout 13. lout 14. nc 1 2 3 4 5 6 7 14 13 12 11 10 9 8
NJM2708 ? 2 ? block diagram (ssop14) 1 2 3 4 5 12 11 10 9 8 bypass rebirth filter bypass rebirth filter 6 7 14 13 v + nc gnd v ref mode sw rin nfl rout nf r v + dnc lin stby sw lout nc bias
NJM2708 ? 3 ? absolute maximum rating (ta=25 c) parameter symbol rating unit power supply voltage v + 14 v power dissipation p d 400 note: eia/jedec standard test board (76.2x114.3x1.6mm, 2layer, fr-4) mounting mw operating temperature range topr -40 ~ +85 c storage temperature range tstg -40 ~ + 125 c operating voltage parameter symbol test condition min. typ. max. unit operating voltage v + 1.8 9.0 13 v electrical characteristics (ta=25 c, v + =9v, unless otherwise specified) test condition input parameter symbol l r output mode vr min typ max unit 0 0 - active - - 750 1300 0 0 - standby - - 0.1 1.0 supply current i cc no signal 0 0 - eala rebirth max - 750 1300 a reference voltage v ref no signal 0 0 - - - 3.65 4.15 4.65 v ac characteristics (ta=25 c, v + =9v, vin= 1.5vrms,f=1khz,r l =10k ? ,unless otherwise specified) test condition input parameter symbol l r output mode vr min typ max unit v in - l f=1khz thd=1% - v in r bypass - 2.2 3.0 - v in - l f=1khz thd=1% - v in r eala rebirth max 1.5 2.7 - v in - l f=10khz thd=1% - v in r bypass - 2.2 3.0 - v in - l maximum input voltage v im f=10khz thd=1% - v in r eala rebirth max 1.0 1.6 - vrms l rg=0 ? a-weighted 0 0 r bypass - - -112 (2.5) -106 (5.0) l output noise v no rg=0 ? a-weighted 0 0 r eala rebirth max - -100 (10) -94 (20) dbv (vrms) v in - l v in =1.5vrms f=1khz - v in r bypass - - 0.002 0.01 v in - l to t a l harmonic distortion thd+n v in =0.75vrms f=10khz - v in r eala rebirth max - 0.1 - %
NJM2708 ? 4 ? test condition input parameter symbol l r output mode vr min typ max unit v in - l bypass gain g vbyp v in =1.5vrms f=1khz - v in r bypass - -1.0 0.0 1.0 db v in - l eala rebirth gain g eala v in =0.75vrms f=10khz - v in r eala rebirth max 3.0 5.0 7.0 db control characteristics (ta=25 c, v + =9v, unless otherwise specified) parameter symbol test condition min. typ. max. unit v in =high level 1.2 - v + v mode select control voltage v mode v in =low level 0.0 - 0.3 v switch function mode sw standby sw mode sw notes bypass l, open input through eala rebirth h eala rebirth(stereo input) mode sw notes standby l, open ic is non-active active h ic is active
NJM2708 ? 5 ? application circuit 1 2 3 4 5 6 7 14 13 12 11 10 9 8 + + + + 10uf 10uf 10uf 10uf rch input lch input rch output lch output + 100uf +9v + 10uf + 1uf v+ gnd lin rin lout rout vref mode sw dnc nc standby sw nc nfl nfr 100k ? 2.2nf 22k ? vr:10k ? max min
NJM2708 ? 6 ? terminal description (ta=25 c, v + =9v) pin no. symbol function equivalent circuit voltage 1 standby sw standby switch v+ 700 225k v+ 75k 0v 2 3 lin rin lch input rch input 700 v+ v+ 100k vref v+ 4.15v 4 mode sw mode control switch 700 300k v+ v+ v+ 0v 5 vref reference voltage 300k v+ v+ v+ 300k 4.15v
NJM2708 ? 7 ? terminal description (ta=25 c, v + =9v) pin no. symbol function equivalent circuit voltage 7 14 nc no connect - 8 dnc do not connect - 9 v+ power supply v+ 10 11 nfr nfl rch filter terminal lch filter terminal v+ v+ 400 20k 4.15v 12 13 rout lout rch output lch output v+ v+ v+ v+ 12k 20k 4.15v
NJM2708 ? 8 ? [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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