ics for audio common use 1 an7397k, an7397s spatializer ic for i 2 c bus 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 an7397k, an7397s 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 localization 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. ? an on-chip serial control bus (i.e., i 2 c) to vary space-effect and change modes. applications ? televisions, videos, audio equipment, dvds, per- sonal computers, and game machines pin assignment sop020-p-0300b an7397s sdip020-p-0300 an7397k 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 20 19 18 17 16 15 14 13 12 11 l-in 1/2 v cc l-out s-out r-out r-ret. mode l-ret. d-gnd scl 1 2 3 4 5 6 7 8 9 10 gnd r-in f-out f-in vca space v cc r-det.2 r-det.1 sda 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.
an7397k, an7397s ics for audio common use 2 parameter symbol range unit supply voltage v cc 4.5 to 6.8 v parameter symbol rating unit supply voltage v cc 7.0 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 descriptions absolute maximum ratings recommended operating range pin no. description 1 l-in 2 1/2 v cc 3 l-out 4 s-out 5 r-out 6 r-ret. 7 mode 8 l-ret. 9 d-gnd 10 scl pin no. description 11 sda 12 r-det.1 13 r-det.2 14 v cc 15 space 16 vca 17 f-in 18 f-out 19 r-in 20 gnd
ics for audio common use an7397k, an7397s 3 electrical characteristics at v cc = 5 v, f = 1 khz, t a = 25 c 2 c 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 (i 2 c data: bfh) * 4 : mode: st, vca (i 2 c data: bfh) * 5 : mode: st, vca (i 2 c data: 80 h) * 6 : mode: st, vca (i 2 c data: 80 h) for either l-in or r-in ? design reference data parameter symbol conditions min typ max unit total circuit current i total v in = 0 mv 18 25 32 ma maximum output voltage * 3 v out1 l-in, r-in thd = 1% 0.8 1.0 ? v[rms] output noise voltage 1 * 1, 4 v no1 l-out, r-out r g = 4.7 k ?? 20 50 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 0.2 % output noise voltage 2 * 1, 5 v no2 s-out r g = 4.7 k ?? 80 200 v[rms] voltage gain 2 * 6 g v2 s-out v in = 60 mv 343 450 685 mv[rms] total harmonic distortion 2 * 2, 6 thd 2 s-out v in = 60 mv ? 0.15 0.3 % i 2 c interface sink current at ack i ack maximum value of sink current of 2.0 10 ? ma pin 11 at ack scl/sda signal input high- level v ihi 2.5 ? 3.5 v scl/sda signal input low- level v ilo 0 ? 0.5 v input-enable maximum frequency f imax ?? 100 kbit/s parameter symbol conditions min typ max unit i 2 c interface bus free before start t buf 4.0 ?? s start condition set-up time t su, sta 4.0 ?? s start condition hold time t hd, sta 4.0 ?? s scl/sda low period t lo 4.0 ?? s scl high period t hi 4.0 ?? s scl/sda rise time t r ?? 1.0 s scl/sda fall time t f ?? 0.35 s data set-up time (write) t su, dat 0.25 ?? s data hold time (write) t hd, dat 0 ?? s acknowledge set-up time t su, ack ?? 3.5 s acknowledge hold time t hd, ack 0 ?? s stop condition set-up time t su, sto 4.0 ?? s dac 6-bit dac dnle l 6 1 lsb = (data (max.) ? data (00))/63 0.1 1.0 1.9 lsb step
an7397k, an7397s ics for audio common use 4 electrical characteristics at v cc = 5 v, f = 1 khz, t a = 25 c 2 c (continued) ? dac timing chart 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. sda start condition t buf t su.dat t su.sta t hd.sta t r t f t hi t lo t hd.dat t su.sto t lo slave address data byte stop condition ack ack scl
ics for audio common use an7397k, an7397s 5 application circuit example (basic circuitry) 20 19 18 17 16 15 14 13 12 11 l-in 1/2 v cc l-out s-out r-out r-ret. mode l-ret. d-gnd scl 1 2 3 4 5 6 7 8 9 10 f-out f-in vca space v cc r-det.2 r-det.1 sda gnd r-in 1 f 2.2 f 2.2 f 2.2 f 1 f 33 f 10 nf a 100 nf 1 f 22 f * 10 f 10 f 150 k ? b b i 2 c gen a 47 nf 47 nf gnd note) when switching noise occurs at mode switching, insert a capacitor between pin 7 and gnd. *: for the capacitor of 22 f, use that of a non-polar type.
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