Introduction

The Agere Systems Inc. L9214 is a subscriber line interface circuit that is optimized to provide a very low-cost solution for short- and medium-loop 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.

特性 Features

■ Low-cost solution

■ Onboard ringing generation with software adjustable crest factor switching

■ Flexible VCC options:

— 3.3 V or 5 V VCC

— No –5 V required

■ Power control options:

— Power control resistor

— Automatic battery switch to minimize off-hook power

■ Eight operating states:

— Scan mode for minimal power dissipation

— Forward and reverse battery active

— On-hook transmission states

— Ring mode

— Disconnect mode

■ Low on-hook power:

— 25 mW scan mode

— 165 mW active mode

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

■ Loop start, ring trip, and ground key detectors

■ Programmable current limit

■ On-hook and scan mode line voltage clamp

■ Thermal protection

■ 48-pin MLCC, 32-pin PLCC, and 28-pin SOG (Please contact your Agere Sales Representative for availability) packages

Applications

■ Voice over Internet Protocol (VoIP)

■ Cable Modems

■ Terminal Adapters (TA)

■ Wireless Local Loop (WLL)

■ Telcordia Technologies? GR-909 Access

■ Network Termination (NT)

■ PBX

■ Key Systems