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KA8512

Samsung
Part Number KA8512
Manufacturer Samsung
Description COMPANDOR
Published Apr 25, 2005
Detailed Description KA8512 COMPANDOR INTRODUCTION Compandor is a composite word of compressor and expander. It is used for maintaining dyn...
Datasheet PDF File KA8512 PDF File

KA8512
KA8512

Overview
KA8512 COMPANDOR INTRODUCTION Compandor is a composite word of compressor and expander.
It is used for maintaining dynamic range and improving of S/N ratio, and generally called as a noise reduction system or automatic gain control system.
KA8512 consists of compressor, expander, mic amp, Iimiter, ALC(automatic level control) and mute logic.
14-DIP-300 FEATURES • • • • Operating voltage range : 2 ~ 6V Included ALC circuit Easy gain control to use 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 EPI ERC EMUTE CMUTE 2 15K 3 RECTIFIER 30K 5 6 MUTE LOGIC 10K GAIN CELL G 10K _ 4 VREF + SUM AMP + LIMITER VREF _ 24K 30K 10K 15K GAIN CELL G ALC 15K + MIC AMP 51K EO + CO VREF 3.
3K 12 _ 125K 125K _ 30K 9 8 11 CPICPI+ AGIC 13 ALC BIAS CIRCUIT RETIFIER 7 GND 14 VCC 1 VREF 10 CRC KA8512 COMPANDOR PIN CONFIGURATION VR E F EPI ERC EO EMUTE CMUTE GND 1 2 3 4 5 6 7 KA8512 14 13 12 11 10 9 8 VC C ALC CO AGIC CRC CPICPI+ PIN DESCRIPTION Pin No 1 Symbol VREF Description It is a voltage reference (VREF=1V) used for supplying a constant voltage to the compressor and expander of compandor.
It is SUM AMP input terminal of expander.
The voice signal recoverd after 2 EPI the demodulation waveform from the receiver passed through the 2’ nd order low pass filter enters this terminal.
This terminal is used for converting waveform from the full wave rectifier to 3 ERC DC element at the rectifier block of expander (R X C = 22msec) 4 EO It is an output terminal of expander, which a regenerated voice signal comes out.
It is an expander mute terminal of compandor and the final mute block of an expander located next to the receiver terminal.
It blocks the data sig5 EMUTE nal of MICOM being transmitted to an user, and is connected to the RX mute terminal of MICOM.
Expanding is executed if this terminal is high, and expander mute is execut...


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