The BA6569AS and BA6569AFP are speech networks which possesses the basic functions required for handset communications. In addition to amplifying signals from a transmitter and sending them to a telephone line, they also amplify only reception signals from a telephone line and drive the receiver. In addition to a function which compensates for fluctuation in the transmission and reception volume caused by the length of the telephone line (AGC), they are also equipped with a manual PAD function in order to accommodate PBX.

Features
1) Basic speech network functions built in.
2) Single output pin of reception pre-amplifier is separate.
3) Single input pin of reception pre-amplifier is separate, enabling mixing of input.
4) Input to microphone pre-amplifier is balanced and offers high resistance to in-line noise.
5) Input pin of MF pre-amplifier enables mixing of input.
6) Manual pad pin included.
7) Pre-amplifiers for reception, microphone, and MF employ AGC based on telephone line current.
8) AC impedance can be raised by altering the positive feedback. This enables configuration of power supply circuits for microcomputers and other applications using only a single resistor.
9) A BTL circuit is used for reception output, and the wide dynamic range enables both dynamic and ceramic receivers to be accommodated.
10) Few external attachments are required.
11) 22-pin SDIP and 24-pin HSOP packages available.

Applications
    Telephones and telephone equipment