BA6569AS

Communication ICs Speech network for telephones BA6569AS / BA6569AFP 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. FApplications Telephones and telephone equipment FFeatures 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. FAbsolute maximum ratings (Ta = 25_C) 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 ext...