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
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 VCC
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
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC = 3V, f = 1KHz, Ta = 25°C, unless otherwise noted)
Characteristic Symbol Value Unit
Supply Voltage VCC 10 V
KA8507 1000
KA8507D 410
Operating Temperature TOPR - 20 ~ + 70 °C
Storage Temperature TSTG - 55 ~ + 150 °C
Characteristic Symbol Test Condition Min Typ Max Unit
DC ELECTRICAL CHARACTERISTICS
Operating Voltage VCC - - 2.4 7.0 V
Operating Current ICC No Signal - 4.0 6.5 mA
COMPRESSOR PART
Standard Input Voltage (0dB) VI (COMP) VCC = 300mVrms = 0dB 8.0 12.5 17.0 mVrms
∆GV1 (COMP) Vin = -20dB -0.5 0 +0.5
∆GV2 (COMP) Vin = -40dB -1.0 0 +1.0
Bypath Gain Difference ∆GVB (COMP) Vin = 0dB, BYPATH = GND -1.5 0 +1.5 dB
Output Distortion THD COMP Vin = 0dB - 0.5 1.0 %
Noise Output Voltage VNO (COMP) Rg = 620ohm - 3.0 5.5 mVrms
Mute Attenuation Ratio ATT MUTE Vin = 0dB, CMUTE = GND 60 80 - dB
Limiting Voltage VLIM (COMP) - 1.15 1.35 1.50 Vp-p
EXPANDER PART
Standard Output Level (0dB) VO (EXP) Vin = 30mVrms = 0dB 110 130 160 mVrms
∆GV1 (EXP) Vin = -10dB-0.5 -0.5 0 +0.5
Gain Difference ∆GV2 (EXP) Vin = -20dB -1.0 0 +1.0 dB
∆GV3 (EXP) Vin = -30dB -1.5 0 +2.0
Bypath Gain Difference ∆GVB (EXP) Vin = 0dB, BYPATH = GND -2.5 0 +0.5 dB
Output Distortion THD EXP Vin = 0dB - 0.5 1.5 %
Noise Output Voltage VNO (EXP) Rg = 620ohm - 10.0 30.0 µVrms
Mute Attenuation Ratio ATT MUTE Vin = 0dB, EMUTE = GND 60 80 - dB
Max. Output Voltage VOEXP (MAX) THD = 10% 700 800 - mVrms
Power Dissipation PD mW
Gain Difference dB
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 1µF
1µF 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
+
APPLICATION CIRCUIT
(HAND SET)
12345678910 20191817161514131211
-+ - +
+ - +
REG
++ + + ++
-+ REGLOGIC Speaker
Vcc 390K
473 2.2µF Data output473
33K 10K
0.47µF Expanderinput104
47K
10µF ExpanderMute CompressorMute
Exp
FilterAmp Comp
51K3.3K
33KTO TXModulation 5.6K 104
132 101
120K 39K 33K473 22µF22µF 1µF
8.2K 223103 2.2K
MIC 47µF
Fig. 4
