INTRODUCTION 
The KA8501A is a telephone speech network integrated circuit which includes transmit amp, receive amp, DTMF amp, voltage regulator, line equalizer, voltage comparator. It handles the voice signal, performing the 2/4 wires interface and changing the gain on both sending and receiving amplifiers to compensate the line current. The KA8501A can work in fixed gain mode.

FEATURES
• Adjusts sending and receiving attenuation length
• Regulated voltage for dialer
• Linear interface for DTMF
• Suitable for ceramic transducers
• Mute function