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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 -20C ~ + 70C
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
VREF 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' order nd 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 executed if it is low.
KA8512
COMPANDOR
PIN DESCRIPTION (Continued)
Pin No Symbol Description It is compressor mute terminal of a compandor. Mute block is used to avoid duplication of data transmission from MICOM 6 CMUTE (Between the base and hand set) with the voice signal. It is connected to the TX mute terminal of MICOM. Compressing is executed if the terminal is high, and compressor mute is executed if it is low. 7 8 GND CPI+ It is ground terminal. It is a MIC AMP non-inverting input terminal of compressor, and is used as an input terminal for voice signal. It is a MIC AMP inverting input terminal of compressor, and is used for 9 CPIadjusting the negative feedback loop gain. (In application, gain is about 5) This terminal is used for converting waveform from the full wave rectifier 10 CRC to DC element at the rectifier block of compressor. (R X C = 22msec) This terminal is used for bypassing an AC element at the feed-back loop 11 AGIC which comes from the SUM AMP block of compressor. A capacitor should be connected between this terminal and GND. 12 CO It is a compressor output terminal of compandor, and is connected to the modulation input terminal of transmitter. It is a reference voltage input terminal of ALC (Automatic Level Control). ALC circuit may be turned off according to the ALC reference voltage, ma13 ALC gnitude of output voltage may be limited if it is used for adjusting THD of output voltage of compressor to less than 3% or to limit the frequency of TX in case the input is higher than a certain level. 14 VCC It is supply voltage terminal.
KA8512
COMPANDOR
ABSOLUTE MAXIMUM RATINGS
Characteristic Maximum Supply Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VCC(MAX) PD T OPR T STG Value 7 600 - 20 ~ + 70 - 55 ~ + 150 Unit V mW C C
ELECTRICAL CHARACTERISTICS
(VCC = 3V, f = 1KHz, Ta = 25C, Unless otherwise Specified) Characteristic DC 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 No Signal VINC = 13mVrms = 0dB VINC = -20dB VINC = -40dB VINC = 0dB VINC = 0dB VINC = Variable VALC = 0.87V -0.5 -1.5 60 1.15 280 0 0.7 0.5 80 1.35 325 +0.5 0 1.0 1.5 360 dB dB % dB VP-P mVrms 0.9 240 1.0 300 1.1 340 V mVrms VCC ICC No Signal 2.0 3.6 6.0 6.0 V mA Symbol Test Conditions Min Typ Max Unit
Gain Difference Output Distortion Mute Attenuation Ratio Limiting Voltage ALC Expander Part Standard Output Voltage
VO(EXP) GV1(EXP)
VINE = 180mVrms = 0dB VINE = -10dB VINE = -20dB VINE = -30dB VINE = 0dB VINE = 0dB VINE = Variable
110 +1.0 -1.5 -1.5 60 500
130 +0.5 -0.7 0 0.5 85 600
160 0 0 +1.5 1.5 -
mVrms dB dB dB % dB mVrms
Gain Difference
GV2(EXP) GV3(EXP)
Output Distortion Mute Attenuation Ratio Maximum Output Voltage
THDEXP ATTMUTE VOEXP(MAX)
COMPANDOR
VI(COMP) VO (C OM P) Vcc 10K 1uF 10uF 47K 22uF 2.2uF 9.1K 0.47uF 0.047uF 680
14 13
12
11
10
Rectifier
9
8
125K + VREF 125K MUTE Limiter Bias Circuit Gain Cell G 10K 10K VRE F Rectifier 15K _
15K ALC 15K Gain Cell G 51K 10K 30K _ Sum Amp + V RE F 30K 24K + Mic Amp _ 3.3K
30K _ MUT E + Sum Amp
1
2
0.047uF 33uF
3
4
1uF 2.2uF 10K
5
6
7
SW1
SW2
TEST CIRCUIT
KA8512
VI (E X P )
VO(E XP )
KA8512
COMPANDOR
APPLICATION CIRCUIT
Vcc TO TX MODULATION Vcc C14 10uF C13 100nF C12 22uF C11 22uF C10 1uF R13 56K C9 47nF R12 2.2K
MIC
14
13
12
11
10
Rectifier
9
8
125K + V REF _ 125K MUTE 30K
15K ALC 15K Gain Cell G 51K 10K 30K _ 24K VREF + Mic Amp _ 3.3K
Limiter Bias Circuit Sum Amp +
10K
Gain Cell G
30K _ 10K VREF MUTE + Sum Amp
Rectifier 15K
1
2
3
4
C6 100nF R7 1K R8 1K KSC945-G
5
6
7
R5 68K R2 220K C1 68nF FROM RX OUTPUT R1 68K R3 300 C2 68nF R4 68K TR1 R6 68K C4 33uF
C5 22uF
CMUTE (TO MICOM) EMUTE (TO MICOM) 100 Vcc
R10 C8 47uF C7 47uF
C3 100nF C15 100nF
R9 150

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