KA8507 compandor introduction KA8507 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. KA8507 includes compressor, expander, pre-amp, filter amp, limiter and mute/ bypath logic. features wide supply voltage (2.4 ~ 7v) easy gain control mute/ bypath logic data in/out pin block diagram device package operating temperature KA8507 20-dip-300a KA8507d 20-sop-375 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 - 20 c ~ + 70 c ordering information 20-dip-300a 20-sop-375 fig. 1
KA8507 compandor pin configuration fig. 2 pin description 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 KA8507 vcc eo erc do epi- epi+ eb emute bypath cmute pin no symbol description pin no symbol description 1 2 3 4 5 6 7 8 9 10 fo fi co di agic crc cpi - cpi cb gnd filter amp output filter amp input compressor output data input ac gain infinity capacitor compressor rectifier capacitor compressor inverting input compressor non-inverting input compressor reference bias ground 11 12 13 14 15 16 17 18 19 20 cmute bypath emute eb epi + epi - do erc eo v cc compressor mute no companding expander mute expander reference bias expander non-inverting input expander inverting input data output expander rectifier capacitor expander output supply voltage
KA8507 compandor absolute maximum ratings electrical characteristics (v cc = 3v, f = 1khz, ta = 25 c, unless otherwise noted) characteristic symbol value unit supply voltage v cc 10 v KA8507 1000 KA8507d 410 operating temperature t opr - 20 ~ + 70 c storage temperature t stg - 55 ~ + 150 c 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 d g v1 (comp) vin = -20db -0.5 0 +0.5 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 d g v1 (exp) vin = -10db-0.5 -0.5 0 +0.5 gain difference d g v2 (exp) vin = -20db -1.0 0 +1.0 db 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 power dissipation p d mw gain difference db
KA8507 compandor test circuit fig. 3 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 +
KA8507 compandor 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 fig. 4
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