TEA1114A

Note
1. Mostly dependent on the maximum required ambient temperature, on the voltage between LN and SLPE and on the thermal resistance between die ambient temperature. This thermal resistance depends on the application board layout and on the materials used. Figure 13 shows the safe operating area versus this thermal resistance for ambient
temperature T_amb = 75 °C.

The TEA1114A 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 1.45 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 V_DD. The voltage at pin V_DD is regulated to 3.3 V to supply peripherals such as dialler, LCD module and microcontroller.