Datasheet > L9500A

L9500A

更新时间： 2024-11-20 22:31:35

品牌	Logo	应用领域
杰尔 - AGERE		高压
页数	文件大小	规格书
32页	585K
描述
High-Voltage Ringing SLIC for VolP Applications

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L9500A 数据手册

Preliminary Data Sheet

September 2001

L9500A

High-Voltage Ringing SLIC for VoIP Applications

Applications

L9500A Introduction

■ Interface to Broadcom:

— BCM3351 Cable Modem

— BCM3352 Cable Modem

— BCM6352 Integrated Multi-Media Adaptor

— BCM1101 Residential Gateway

The Agere Systems Inc. L9500A 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 (includ-

ing power ringing) needed to interface to a subscriber

loop. This device has the capability to operate with a

V^CCsupply of 3.3 V or 5 V and is designed to mini-

mize external components required at all device

interfaces. This device is optimized to interface to

data over cable service interface specification (DOC-

SIS) compliant cable modem gateway, multi-media

adaptor, and residential gateway products, such as

■ Cable Modem

■ Voice over Internet Protocol (VoIP)

■ Voice over DSL

■ Remote Subscriber Units

■ Broadband Wireless

■ Short Loop Access

the Broadcom BCM3351, BCM3352, BCM6352,

and BCM1101 and equivalent products.

Features

Description

■ Differential ringing and codec interface

■ Onboard ringing generation

This device is optimized to provide battery feed, ring-

ing, and supervision on short-loop plain old tele-

phone service (POTS) loops.

■ Three ringing input options:

— Sine wave

— PWM

This device provides power ring to the subscriber

loop through amplification of a low-voltage input. It

provides forward and reverse battery feed states, on-

hook transmission, a low-power scan state, ground

start (tip open), and a forward disconnect state.

— Logic level square wave

■ Flexible VCC options:

— 5 V or 3.3 V V^CC

— No –5 V required

The device requires a V^CCand battery to operate.

V^CCmay be either a 5 V or a 3.3 V supply. The ring-

ing signal is derived from the high-voltage battery. A

battery switch is included to allow for use of a lower-

voltage battery in the off-hook mode, thus minimizing

short-loop off-hook power.

■ 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

— Ground start

— Ring mode

— Disconnect mode

Ring mode overhead is collapsed, allowing rail-to-rail

operation. In this manner, the L9500 can operate

from a lower 75 V battery to minimize critical power

consumption and at the same time extend subscriber

ringing loop lengths to 500 Ω and beyond.

■ Ultralow on-hook power:

— 27 mW scan mode

— 38 mW active mode

Loop closure, ring trip, and ground start detection is

available. The loop closure detector has a fixed

threshold with hysteresis. The ring trip detector

requires a single-pole filter, thus minimizing external

components required.

■ Loop start, ring trip, and ground start detection

■ Software-controllable dual current limit option

■ 28-pin PLCC package

The dc current limit is set and fixed by a logic-control-

lable pin. Ground or open applied to this pin sets the

current limit at the low or high value.

■ 48-pin MLCC package

The device is offered with differential ringing and

receive input, making it ideal for direct interface to

DOCSIS compliant cable modem gateway products.

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