KA8503

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 controlled by external components. Each gain can be controlled by external component exchange. The receiver output driving capability is adjustable. 18-DIP-300A www.DataSheet4U.com 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 V+ ST3 STO RXI 4 5 1 9 10 15 MIC 1 MIC 2 12 13 17 18 RXO2 RXO3 6 11 3 2 T XO 8 ST2 7 ST1 14 16 VRXO1 GR MICO TXI Fig. 1 KA8503 LOW VOLTAGE SPEECH NETWORK PIN CONFIGURATION V+ 1 2 3 4 5 6 7 8 9 KA8503 18 17 16 15 14 13 12 11 10 RXO3 TXO RXO2 TXI RXO1 VDD RXI www.DataSheet4U.com MUTE V- GR MIC2 ST1 MIC1 ST2 MIC0 ST3 ST0 Fig. 2 PIN DESCRIPTION Pin No 1 2 3 4 5 6 7, 8, 9 10 11 12, 13 14 ...