GENERAL DESCRIPTION
The TEA1111A is a bipolar integrated circuit that performs all speech and line interface functions required in fully electronic telephone sets. It performs electronic switching between speech and dialling. The IC operates at a line voltage down to 1.5 V DC (with reduced performance) to facilitate the use of telephone sets connected in parallel. When the line current is high enough, a fixed amount of current is derived from the LN pin in order to create a strong supply point at pin VDD. The voltage at pin VDD is regulated to 3.25 V to supply peripherals such as dialler, LCD module and microcontroller.

APPLICATIONS
• Line powered telephone sets with LCD module
• Cordless telephones
• Fax machines
• Answering machines.