compander KA8507B 1 introduction KA8507B is a automatic gain control system that is used for dynamic range compression and expansion. according to the companding the signal, this can reduce the noise components. KA8507B includes compressor, expander, pre-amp, filter amp, limiter and mute/bypath logic. features ? wide supply voltage ( 2.4 to 7v ) ? easy gain control ? mute/bypath logic ? data in/out pin ordering information device package operating temperature KA8507B 20 - dip - 300a - 20 c to +70 c KA8507Bd 20 - sop - 375 20 - dip - 300a 20 - sop - 375
KA8507B compander 2 block diagram pin configuration 7 8 - + 5 16 15 - + 6 rectifier variable resistor summing amp 4 3 compressor output buffer compressor mute limiter 2 - + 1 17 bypath variable resistor bypath 18 rectifier summing amp expandor mute 19 9 14 10 bias circuit 20 11 12 13 logic cb cpi- cpi+ epi- epi+ do erc eo cb eb gnd vcc emute bypath cmute fo fi co di crc agic 5.1k 3.3k filter amp fo fi co di agic crc cpi- cpi + cb gnd 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 KA8507B vcc eo erc do epi- epi+ eb emute bypath cmute
compander KA8507B 3 pin description absolute maximum ratings pin no symbol description pin no symbol description 1 fo filter amp output 11 cmute compressor mute 2 fi filter amp input 12 bypath no companding 3 co compressor output 13 emute expander mute 4 di data input 14 eb expander reference bias 5 agic ac gain infinity capacitor 15 epi + expander non-inverting input 6 crc compressor rectifier capacitor 16 epi - expander inverting input 7 cpi - compressor inverting input 17 do data output 8 cpi compressor non-inverting input 18 erc expander rectifier capacitor 9 cb compressor reference bias 19 eo expander output 10 gnd ground 20 v cc supply voltage characteristic symbol value unit supply voltage v cc 10 v power dissipation KA8507B p d 1000 mw KA8507Bd 410 operating temperature t opr - 20 to + 70 c storage temperature t stg - 55 to + 150 c
KA8507B compander 4 electrical characteristics (v cc = 3v, f = 1khz, ta = 25 c, unless otherwise noted) characteristic symbol test condition min. typ. max. unit dc electrical characteristics operating voltage v cc - - 2.4 7.0 v operating current i cc no signal - 4.0 6.5 ma compressor part standard input voltage ( 0db ) v i (comp) v cc = 300mvrms = 0db 8.0 12.5 17.0 mvrms gain defference d g v1 (comp) vin = - 20db - 0.5 0 +0.5 db d g v2 (comp) vin = - 40db - 1.0 0 +1.0 bypath gain difference d g vb (comp) vin = 0db, bypath = gnd - 1.5 0 +1.5 db output distortion thd comp vin = 0db - 0.5 1.0 % noise output voltage v no (comp) rg = 620ohm - 3.0 5.5 mvrms mute attenuation ratio att mute vin = 0db, cmute = gnd 60 80 - db limiting voltage v lim (comp) - 1.15 1.35 1.50 vp-p expander part standard output level ( 0db ) v o (exp) vin = 30mvrms = 0db 110 130 160 mvrms gain difference d g v1 (exp) vin = - 10db - 0.5 0 +0.5 db d g v2 (exp) vin = - 20db - 1.0 0 +1.0 d g v3 (exp) vin = - 30db - 1.5 0 +2.0 bypath gain difference d g vb (exp) vin = 0db, bypath = gnd - 2.5 0 +0.5 db output distortion thd exp vin = 0db - 0.5 1.5 % noise output voltage v no (exp) rg = 620ohm - 10.0 30.0 m vrms mute attenuation ratio att mute vin = 0db, emute = gnd 60 80 - db max. output voltage v oexp (max) thd = 10% 700 800 - mvrms
compander KA8507B 5 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 fo fi co di agic crc cpi- cpi + cb gnd ka8507 vcc eo erc do epi- epi+ eb emute bypath cmute + + + + + + + + + + comp out 1 m f 1 m f 100k 22uf 2.2uf 9.1k 0.47uf comp in 474 620 4.7uf 10uf vcc exp out 1.0uf 10k 2.2uf 51k 50pf 10k 1.0uf 100k 474 620 exp in 4.7uf sw3 sw2 sw1 10k + KA8507B test circuit
KA8507B compander 6 application circuit (hand set) 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 - + - + + - + reg + + + + + + - + reg logic speaker vcc 390k 473 2.2 m f data output 473 33k 10k 0.47 m f expander input 104 47k 10 m f expander mute compressor mute exp filter amp comp 51k 3.3k 33k to tx modulation 5.6k 104 132 101 120k 39k 33k 473 22 m f 22 m f 1 m f 8.2k 223 103 2.2k mic 47 m f
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