ics for audio common use 1 an7395k, an7395s spatializer ic (3-d surround) overview spatializer audio processor is a signal process- ing technology, monopolized by desper products, inc., that was developed for commercial electronics and multimedia markets, and is based on desper's ?pro spatializer? that is a 3-d audio production system for business use. the an7395k, an7395s utilizes the innovative technology adopted in that system, and provides sound enhancement effect and sound expansion with the conventional 2-speaker stereo system. features ? provides deep 3-d sound with conventional 2- speaker system. ? the audio signal recorded through this ic can be reproduced with usual stereo system. ? performs optimal processing to the sound source recorded with surround-effect so as not to give double effects. ? sound expansion effect can be varied. ? a pseudo stereo effect for the monaural audio sig- nal is achieved. ? positions and moves each sound source on 270 arc in real time. applications ? televisions, videos, audio equipment, personal computers, and game machines pin assignment sop020-p-0300b an7395s sdip020-p-0300 an7395k 20 19 18 17 16 15 14 13 12 11 l-in v ref l-out s-out r-out set r-ret. gnd l-ret. tim1 1 2 3 4 5 6 7 8 9 10 gnd r-in f1 v reg f2 n.c. mode space v cc tim2 0.3 0 to 10 0.15 12.60.3 110 20 11 5.40.3 7.70.3 1.27 (0.60) seating plane seating plane 0.400.25 0.10.1 1.50.2 0.65 7.620.25 3 to 15 0.35 +0.10 ? 0.05 19.10.3 110 20 11 6.350.30 1.778 0.50.1 0.900.25 4.500.25 3.450.25 1.100.25 seating plane unit: mm unit: mm note) spatializer ? and the device trademark of circle-in-square are owned by desper products inc.. this product can be used with the consent of the desper products inc.. under the terms of the agreement between matsushita electronics and desper products inc., no technical information on the spatializer, which is applied to this product, shall be provided.
an7395k, an7395s ics for audio common use 2 parameter symbol range unit supply voltage v cc 6.0 to 10.0 v parameter symbol rating unit supply voltage v cc 11 v supply current i cc 100 ma power dissipation * 2 p d 230 mw operating ambient temperature * 1 t opr ? 25 to + 75 c storage temperature * 1 t stg ? 55 to + 125 c note) * 1: except for the operating ambient temperature and storage temperature, all ratings are for t a = 25 c. * 2: the power dissipation shown is the value for t a = 75 c pin no. descriptions 1 l-in 2v ref 3 l-out 4 s-out 5 r-out 6 set 7 r-ret. 8 gnd 9 l-ret. 10 tim1 pin descriptions absolute maximum ratings recommended operating range pin no. descriptions 11 tim2 12 v cc 13 space 14 mode 15 n.c. 16 f2 17 v reg 18 f1 19 r-in 20 gnd
ics for audio common use an7395k, an7395s 3 note) * 1: in measuring, the filter with a-characteristic curve is used. * 2: in measuring, the filter for the range of 15 hz to 30 khz (12 db/oct) is used. * 3: mode: st, l-in + r-in, vca min. * 4: mode: st, vca min. * 5: mode: st, vca max. * 6: mode: st, vca max. for either l-in or r-in. electrical characteristics at v cc = 9 v, f = 1 khz, t a = 25 c 2 c parameter symbol conditions min typ max unit total circuit current i total v in = 0 mv 5 11 17 ma maximum output voltage * 3 v out1 l-in, r-in thd = 1% 2.0 2.8 ? v[rms] output noise voltage 1 * 1, 4 v no1 l-out, r-out r g = 4.7 k ?? 20 100 v[rms] voltage gain 1 * 3 g v1 l-out, r-out v in = 400 mv ? 20 2 db total harmonic distortion 1 * 2, 3 thd 1 l-out, r-out v in = 400 mv ? 0.05 0.3 % output noise voltage 2 * 1, 5 v no2 s-out r g = 4.7 k ?? 160 600 v[rms] voltage gain 2 * 6 g v2 s-out v in = 60 mv 200 280 400 mv[rms] total harmonic distortion 2 * 2, 6 thd 2 s-out v in = 60 mv ? 0.05 0.3 % mono mode switching voltage v m 4.2 ? v cc v off mode switching voltage v off 0 ? 0.9 v stereo mode switching voltage v st 2.1 ? 2.8 v conceptual explanation of spatializer operation ? normal stereo all sounds are heard from only between two speakers, right and left. ? conventional surround the sound expands toward the outside of the speaker system, but the sound position comes apart mostly in the con- ventional systems. ? spatializer the sound expands toward the outside of the two speakers, and yet their positions are stable and an expanded, deep sound are gotten.
an7395k, an7395s ics for audio common use 4 application circuit example (basic circuitry) 20 19 18 17 16 15 14 13 12 11 l-in l-out s-out r-out r-ret. l-ret. set v ref gnd tim1 1 2 3 4 5 6 7 8 9 10 gnd r-in 22 f 100 f 100 f 10 f 100 f 100 f 1 m ? 22 f 10 f 10 nf 56 nf 39 nf 27 nf vr5 k ? 150 k ? f1 v reg f2 mode space v cc tim2 22 f 1 f note) when switching noise occurs at mode switching, insert a capacitor between pin 14 and gnd.
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