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ptc princeton technology corp. tel : 886-2- 2 9162151 fax : 886-2- 2 9174598 4 mode preset equalizer ic preliminar y preliminary pt 2380 revised jan. 1996 page 1 preliminary 2 description pt 2380 is a pre-set equalizer ic utilizing cmos technology specially designed for audio equipment. it features four sound selections, namely: classical, pops, rock and normal/flat which may be selected by the 2 control pins (sw1 and sw2). pt 2380 has 2 built-in channels - each containing an internal operation amplifier and selectable resistors. thus, least external components are used. by connecting only 3 capacitors to each channel, the high performance pre-set equalizing function of this ic is achieved. pin assignments and application circuit are optimized for easy pcb layout and cost saving for audio applications. pt 2380 is housed in a 16-pin dip or so package and is suitable for stereo sound applications. features r cmos technology r least external components r available in 16 pins, dip or so package r 4 sound effect selections available: classical, pops, rock, and normal/flat r high operating voltage range: vcc = 5 ~ 15 v r two channels in the same chip r can be controlled by micro-processor output pin applications r mini compo r car stereo r radio cassette recorders r multi-media speaker r mpeg card r other audio equipments
ptc princeton technology corp. tel : 886-2- 2 9162151 fax : 886-2- 2 9174598 4-mode preset equalizer ic preliminar y preliminary pt 2380 page 2 block diagram
ptc princeton technology corp. tel : 886-2- 2 9162151 fax : 886-2- 2 9174598 4-mode preset equalizer ic preliminar y preliminary pt 2380 page 3 pin configuration
ptc princeton technology corp. tel : 886-2- 2 9162151 fax : 886-2- 2 9174598 4-mode preset equalizer ic preliminar y preliminary pt 2380 page 4 functional description pt2380 is pre-set to 4 modes: normal/flat, rock, classical and pops. these 4 modes may be selected using two switches, namely: sw1 (pin. no.9) and sw2 (pin no.10). please refer to the table below. mode sw1 sw2 normal/flat low low rock low high classic high low pops high high where low: sw1/sw2 1v and high: sw1/sw2 3 3.5v for vcc = 5 ~ 12 v table 1 : sw1 & sw2 mode conditions the output voltage gain vs. the frequency graph for the 4 preset modes is given below: output voltage gain vs. frequency 10 12 14 16 18 20 22 24 10 100 1000 10000 100000 frequency f (hz) output voltage gain gv (db) rock classic normal pops figure 3 : pt 2380 output voltage gain vs. frequency graph
ptc princeton technology corp. tel : 886-2- 2 9162151 fax : 886-2- 2 9174598 4-mode preset equalizer ic preliminar y preliminary pt 2380 page 5 in order to best describe this ic, an application example is hereby given. the application example?s electrical characteristics are enumerated below. conditions: vcc = 12.0 v, vi = 0.1 vrms and f = 1 khz symbol parameter condition data unit icc circuit operation current vcc=12.0 v vi =0.0 v 8.0 ma gbn p normal mode bass f=80hz 14 db gmn r voltage mid f=1khz 14 db gtn e gain treble f=10khz 14 db gbr s rock mode bass f=80hz 20 db gmr e voltage mid f=1khz 14 db gtr t gain treble f=10khz 16 db gbc classic mode bass f=80hz 16 db gmc m voltage mid f=1khz 14 db gtc o gain treble f=10khz 16 db gbp d pops mode bass f=80hz 12 db gmp e voltage mid f=1khz 16 db gtp gain treble f=10khz 14 db vom maximum output voltage f=1khz vcc=5v,vi=0.3vrms vcc=12v,vi=0.8vrms 1.5 4.0 vrms thd total harmonic distortion bw=400hz~30khz a-weighting 0.02 % vno output noise voltage bw=400hz~30khz a-weighting, vi=0.0v 50 m vrms ri input resistor 50 k w table 2 : application example electrical characteristic values
ptc princeton technology corp. tel : 886-2- 2 9162151 fax : 886-2- 2 9174598 4-mode preset equalizer ic preliminar y preliminary pt 2380 page 6 the sound frequency characteristics of the application example is given below. normal mode sound frequency characteristics 10 15 20 25 10 100 1000 10000 100000 frequency (hz) response (db) figure 4 : normal mode sound frequency characteristics diagram classic mode sound frequency characteristics 10 15 20 25 10 100 1000 10000 100000 frequency (hz) response (db) figure 5 : classic mode sound frequency characteristics diagram
ptc princeton technology corp. tel : 886-2- 2 9162151 fax : 886-2- 2 9174598 4-mode preset equalizer ic preliminar y preliminary pt 2380 page 7 pops mode sound frequency characteristics 10 15 20 25 10 100 1000 10000 100000 frequency (hz) response (db) figure 6 : pops mode sound frequency characteristics diagram rock mode sound frequency characteristics 10 15 20 25 10 100 1000 10000 100000 frequency (hz) response (db) figure 7 : rock mode sound frequency characteristics diagram
ptc princeton technology corp. tel : 886-2- 2 9162151 fax : 886-2- 2 9174598 4-mode preset equalizer ic preliminar y preliminary pt 2380 page 8 absolute maximum ratings (unless otherwise specified, ta=25 o c) symbol parameter ratings unit vcc max supply voltage 15 v pd power dissipation (ta 25 o c) 1000 mw ko thermal derating (ta > 25 o c) 10.0 mw/ o c topr operating temperature -20 ~ 75 o c tstg storage temperature -40 ~ 125 o c v i switch input voltage range -0.3 ~ vcc+0.3 v application circuits
ptc princeton technology corp. tel : 886-2- 2 9162151 fax : 886-2- 2 9174598 4-mode preset equalizer ic preliminar y preliminary pt 2380 page 9
ptc princeton technology corp. tel : 886-2- 2 9162151 fax : 886-2- 2 9174598 4-mode preset equalizer ic preliminar y preliminary pt 2380 page 10
ptc princeton technology corp. tel : 886-2- 2 9162151 fax : 886-2- 2 9174598 4-mode preset equalizer ic preliminar y preliminary pt 2380 page 11

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