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KA8503 Datasheet

Low Voltage Speech Network

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KA8503
LOW VOLTAGE SPEECH NETWORK
INTRODUCTION
The KA8503 is a telephone low voltage speech network which includes
mic amp. transmit amp, side-tone amp, receive amp. It handles the
voice signal performing the 2/4 wire interface and changing the gain
on both sending and receiving amplifiers to compensate for line at-
tenuation by sensing the line length through the line current. Applica-
tion dependent parameters such as amplitude of each amp, sidetone
level line balance, and frequency response are controlled by exter-
nal components. Each gain can be controlled by external component
exchange. The receiver output driving capability is adjustable.
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18-DIP-300A
FEATURES
Adjust Sending and Receiving Attenuation Length
Mute Function
Side Tone Balance Network Constitution
Low Voltage Operating
AC Impedance Matching
Uses in Inexpensive Components (5 Capacitors & 10 Resistors)
Uses a minimum of external components
ORDERING INFORMATION
Device
KA8503
Package
18-DIP-300A
Operating Temperature
- 40°C ~ + 70°C
BLOCK DIAGRAM
VDD MUTE
45
V + ST3 STO RXI
1 9 10 15
MIC 1 12
MIC 2 13
17 RXO2
18 RXO3
6 11 3
GR MICO TXI
2 87
T XO
ST2 ST1
Fig. 1
14 16
V - RXO1


  Samsung Electronic Components Datasheet  

KA8503 Datasheet

Low Voltage Speech Network

No Preview Available !

KA8503
LOW VOLTAGE SPEECH NETWORK
PIN CONFIGURATION
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V+ 1
TXO 2
TXI 3
4VDD
MUTE 5
GR 6
ST1 7
ST2 8
ST3 9
18 RXO3
17 RXO2
16 RXO1
15 RXI
KA8503 14 V -
13 MIC2
12 MIC1
11 MIC0
10 ST0
Fig. 2
PIN DESCRIPTION
Pin No
1
2
3
4
5
6
7, 8, 9
10
11
12, 13
14
15
16
17, 18
Symbol
V+
TXO
TXI
VDD
MUTE
GR
ST1, ST2,
ST3
STO
MIC0
MIC1, MIC2
V-
RXI
RXO1
RXO2, ROX3
Description
Postive power line and transmit amplifier output.
Transmit amplifier output. The resistor which is connected this pin to V - sets DC
resistance of the circuit. The value of resistor is suitable for 47 ~ 100.
Transmit amplifier input. Input impedance is 17KΩ ± 20%
DC power supply pin. This pin will be connected to a decoupling capacitor
47µF~ 100 µF.
Mute active high input.
Gain regulation control input. Input impedance is 5.5 KΩ ± 20%.
Seperate amplifier control inputs.
Seperate amplifier output.
Microphone amplifier output.
Microphone amplifier inputs. Input impedance is 1.7 KΩ ± 20%
Negative power line.
Receive amplifier input.
Receive amplifier output.
Receive amplifier output. Output impedance is 3(Typ)


Part Number KA8503
Description Low Voltage Speech Network
Maker Samsung Semiconductor
Total Page 4 Pages
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