Introduction

The Agere Systems Inc. L9215 is a subscriber line interface circuit that is optimized for short-loop, power-sensitive applications. This device provides the complete set of line interface functionality (including power ringing) needed to interface to a subscriber loop. This device has the capability to operate with a VCC supply of 3.3 V or 5 V and is designed to minimize external components required at all device interfaces.

Features

■ Onboard ringing generation

■ Three ringing input options:

— Sine wave

— PWM

— Logic level square wave

■ Flexible VCC options:

— 5 V or 3.3 V VCC

— No –5 V required

■ Battery switch to minimize off-hook power

■ 11 operating states:

— Scan mode for minimal power dissipation

— Forward and reverse battery active

— On-hook transmission states

— Meter pulse states

— Ring mode

— Disconnect mode

■ Ultralow on-hook power:

— 27 mW scan mode

— 42 mW active mode

■ Two SLIC gain options to minimal external components in codec interface

■ Loop start, ring trip, and ground key detectors

■ Software- or hardware-controllable current-limit and overhead voltage

■ Meter pulse compatible

■ 32-pin PLCC package

■ 48-pin MLCC package

Applications

■ Voice over Internet Protocol (VoIP)

■ Cable Modems

■ Terminal Adapters (TA)

■ Wireless Local Loop (WLL)

■ Telcordia Technologies™ GR-909 Access

■ Network Termination (NT)

■ Key Systems