Telephone Line Interface

The TCA3388 is a telephone line interface circuit which performs the basic functions of a telephone set in combination with a microcontroller and a ringer. It includes dc and ac line termination, the hybrid function with 2 adjustable sidetone networks, handset connections and an efficient supply point.

FEATURES

Line Driver and Supply

• DC and AC Termination of the Telephone Line

• Selectable DC Mask: France, U.K., Low Voltage

• Current Protection

• Adjustable Set Impedance for Resistive and Complex Termination

• Efficient Supply Point for Peripherals

• Hook Status Detection

Handset Operation

• Transmit and Receive Amplifiers

• Double Anti–Sidetone Network

• Line Length AGC

• Microphone and Earpiece Mute

• Transmit Amplifier Soft Clipping

Dialing and Ringing

• Interrupter Driver for Pulse–Dialing

• Reduced Current Consumption During Pulse–Dialing

• DTMF Interfacing

• Ringing via External Ringer

Application Areas

• Corded Telephony

• Cordless Telephony Base Station

• Answering Machines

• Fax

• Intercom

• Modem