COMPANDOR
KA8512
COMPANDOR
INTRODUCTION
Compandor is a composite word of compressor and expander. It is used for maintaining dyn...
Description
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 fu...
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