KA8503 - Low Voltage Speech Network
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 VRXI RXO1 RXO2, ROX3 Seperate amplifier output.
Microphone amplifier output.
Microphone amplifier inputs.
Input impedance is 1.7 KΩ Negative power line.
Receive amplifier input.
Re
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 attenuation by sensing the line length through the line current.
Application dependent parameters such as amplitude of each amp, sidetone level line balance, and frequency response are
KA8503 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 extern
