VOLTAGE SPEECH NETWORK KA8503 telephone voltage speech network wh
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KA8503
VOLTAGE SPEECH NETWORK
KA8503 telephone voltage speech network which includes amp. transmit amp, side-tone amp, receive amp. handles voice signal performing wire interface changing gain both sending receiving amplifiers compensate line attenuation sensing line length through line current. Application dependent parameters such amplitude each amp, sidetone level line balance, frequency response controlled external components. Each gain controlled external component exchange. receiver output driving capability adjustable.
18-DIP-300A
FEATURES
Adjust Sending Receiving Attenuation Length Mute Function Side Tone Balance Network Constitution Voltage Operating Impedance Matching Uses Inexpensive Components Capacitors Resistors) Uses minimum external components
ORDERING INFORMATION
Device KA8503 Package 18-DIP-300A Operating Temperature 40°C 70°C
BLOCK DIAGRAM
MUTE
RXO2 RXO3
VRXO1
MICO
Fig.
KA8503
VOLTAGE SPEECH NETWORK
CONFIGURATION
KA8503
RXO3
RXO2
RXO1
MUTE
MIC2
MIC1
MIC0
Fig.
DESCRIPTION
Symbol MUTE ST1, ST2, MIC0 MIC1, MIC2 VRXI RXO1 RXO2, ROX3 Seperate amplifier output. Microphone amplifier output. Microphone amplifier inputs. Input impedance Negative power line. Receive amplifier input. Receive amplifier output. Receive amplifier output. Output impedance 3(Typ) Description Postive power line transmit amplifier output. Transmit amplifier output. resistor which connected this sets resistance circuit. value resistor suitable 100. Transmit amplifier input. Input impedance
power supply pin. This will connected decoupling capacitor 47µF~ Mute active high input. Gain regulation control input. Input impedance Seperate amplifier control inputs. 20%.
KA8503
VOLTAGE SPEECH NETWORK
ABSOLUTE MAXIMUM RATINGS
Characteristic Line Voltage (3ms max) Forward Line Current Reverse Line Current Power Dissipation 70°C) Operating Temperature Storage Temperature Symbol Value -150 Unit
ELECTRICAL CHARACTERISTICS
(Refer test circuits, 100mA, 3.4KHz, 25°C, unless otherwise specified) Characteristic Line Voltage Symbol (TX) (RES) 1KHz Test Conditions 15mA 100mA 20mA 38.5mA 55mA Test 43.5 -13.5 -18.5 45.5 -11.5 -16.5 47.5 -9.5 -14.5 Unit
Gain Range Regulation
Frequency Response
Dynamic Output Voltage Output Voltage Input Impedance Mute Input Current Gain Range Regulation Frequency Response
(TX) VOTX (MAX) (TX) (MUTE) (RX) (RES)
Dynamic Output Voltage
(RX)
Output Voltage
VORX (MAX)
GTX1 GTX3 200Hz 20mA 3.4KHz 200Hz 80mA 3.4KHz 20mA, 200Hz 3.4KHz 100mA, 200Hz 3.4KHz 20mA, 200Hz 3.4KHz 100mA, 200Hz 3.4KHz 20mA, 200Hz 3.4KHz 20mA 0.1mA 20mA 0.5V 38.5mA 1KHz 55mA GRX1 GRX3 0.5V 200Hz 20mA 3.4KHz 0.5V 200Hz 80mA 3.4KHz 200Hz 20mA 3.4KHz 200Hz 100mA 3.4KHz 20mA 200Hz 3.4KHz
Vp-p Vp-p
Vp-p
Vp-p
KA8503
VOLTAGE SPEECH NETWORK
TEST CIRCUIT
Line
6.2K 47uF 1.5M
Mute 470uF 470uF 20uF
1.7K
KA8503
3.6K
1.5M
47uF
22uF Line
9.1K
1.5M
Fig.
*sw1 *sw2 *sw3
KA8503
470uF
*Side tone Fig.
GV(TX)
*sw1: *sw2: *sw3:
KA8503
470uF
(RX) Fig.
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