COMPANDOR Compandor composite word compressor expander. used main

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COMPANDOR Compandor composite word compressor expander. used main

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KA8512
COMPANDOR
Compandor composite word compressor expander. used maintaining dynamic range improving ratio, generally called noise reduction system automatic gain control system. KA8512 consists compressor, expander, amp, Iimiter, ALC(automatic level control) mute logic. 14-DIP-300
FEATURES
Operating voltage range Included circuit Easy gain control external component Included mute function
14-SOP-225B
ORDERING INFORMATION
Device KA8512 KA8512D Package 14-DIP-300 14-SOP-225B Operating Temperature -20°C 70°C
BLOCK DIAGRAM
EMUTE CMUTE
RECTIFIER
MUTE LOGIC GAIN CELL
VREF LIMITER VREF GAIN CELL
VREF 3.3K
125K 125K
CPICPI+ AGIC
BIAS CIRCUIT
RETIFIER
VREF
KA8512
COMPANDOR
CONFIGURATION
EMUTE CMUTE
KA8512
AGIC CPICPI+
DESCRIPTION
Symbol VREF Description voltage reference (VREF=1V) used supplying constant voltage compressor expander compandor. input terminal expander. voice signal recoverd after demodulation waveform from receiver passed through order pass filter enters this terminal. This terminal used converting waveform from full wave rectifier element rectifier block expander 22msec) output terminal expander, which regenerated voice signal comes out. expander mute terminal compandor final mute block expander located next receiver terminal. blocks data sig5 EMUTE MICOM being transmitted user, connected mute terminal MICOM. Expanding executed this terminal high, expander mute executed low.
KA8512
COMPANDOR
DESCRIPTION (Continued)
Symbol Description compressor mute terminal compandor. Mute block used avoid duplication data transmission from MICOM CMUTE (Between base hand set) with voice signal. connected mute terminal MICOM. Compressing executed terminal high, compressor mute executed low. CPI+ ground terminal. non-inverting input terminal compressor, used input terminal voice signal. inverting input terminal compressor, used CPIadjusting negative feedback loop gain. application, gain about This terminal used converting waveform from full wave rectifier element rectifier block compressor. 22msec) This terminal used bypassing element feed-back loop AGIC which comes from block compressor. capacitor should connected between this terminal GND. compressor output terminal compandor, connected modulation input terminal transmitter. reference voltage input terminal (Automatic Level Control). circuit turned according reference voltage, ma13 gnitude output voltage limited used adjusting output voltage compressor less than limit frequency case input higher than certain level. supply voltage terminal.
KA8512
COMPANDOR
ABSOLUTE MAXIMUM RATINGS
Characteristic Maximum Supply Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VCC(MAX) Value Unit
ELECTRICAL CHARACTERISTICS
(VCC 1KHz, 25°C, Unless otherwise Specified) Characteristic Electrical Characteristics Operating Voltage Operating Current Compressor Part Reference Voltage Standard Output Voltage VREF VO(COMP) GV1(COMP) GV2(COMP) THDCOMP ATTMUTE VLIM(COMP) VALCO Signal VINC 13mVrms VINC -20dB VINC -40dB VINC VINC VINC Variable VALC 0.87V -0.5 -1.5 1.15 1.35 +0.5 VP-P mVrms mVrms Signal Symbol Test Conditions Unit
Gain Difference Output Distortion Mute Attenuation Ratio Limiting Voltage Expander Part Standard Output Voltage
VO(EXP) GV1(EXP)
VINE 180mVrms VINE -10dB VINE -20dB VINE -30dB VINE VINE VINE Variable
+1.0 -1.5 -1.5
+0.5 -0.7
+1.5
mVrms mVrms
Gain Difference
GV2(EXP) GV3(EXP)
Output Distortion Mute Attenuation Ratio Maximum Output Voltage
THDEXP ATTMUTE VOEXP(MAX)
COMPANDOR
VI(COMP) 10uF 22uF 2.2uF 9.1K 0.47uF 0.047uF
Rectifier
125K 125K MUTE Limiter Bias Circuit Gain Cell Rectifier
Gain Cell 3.3K
0.047uF 33uF
2.2uF
TEST CIRCUIT
KA8512
VO(E
KA8512
COMPANDOR
APPLICATION CIRCUIT
MODULATION 10uF 100nF 22uF 22uF 47nF 2.2K
Rectifier
125K 125K MUTE
Gain Cell VREF 3.3K
Limiter Bias Circuit
Gain Cell
VREF MUTE
Rectifier
100nF KSC945-G
220K 68nF FROM OUTPUT 68nF 33uF
22uF
CMUTE MICOM) EMUTE MICOM)
47uF 47uF
100nF 100nF

COMPANDOR Compandor composite word compressor expander. used main

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