INTRODUCTION

The KA2425A is telephone speech network integrated circuit which includes transmit amp, receive amp, side tone amp, DC loop interface function, DTMF input, voltage regulator for speech, a regulated output voltage for a dialer, and equalization circuit .

FEATURES

• Low voltage operation (1.5v : speech)

• Transmit, receive, side tone and DTMF level are controlled by external resistors

• Regulated voltage for dialer

• Loop length equalization

• MUTE function

• Linear interface for DTMF