L9215G - Agere Systems, Inc.

Product Brief

June 2000

L9215A/G

Short-Loop Sine Wave Ringing SLIC

Introduction

The L9215 is a subscriber line interface circuit that is

optimized for short-loop, power sensitive applica-

tions. 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

— Sinewave

— PWM

— Logic level squarewave

■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

— 41 mW active mode

■Two SLIC gain options to minimal external compo-

nents 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

Applications

■Voice over Internet Protocol (VoIP)

■Cable Modems

■Terminal Adapters (TA)

■Wireless Local Loop (WLL)

■

Telcordia

Technologies

* TA-909 Access

■Network Termination (NT)

■Key Systems

Description

This device is optimized to provide battery feed, ring-

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

phone service (POTS) loops. Supported loop length

is less than 250 Ω of wire.

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, meter

pulse states, and a forward disconnect state.

The device re quire s a VCC and battery to operate.

VCC may 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.

Loop closure, ring trip, and ground key detectors are

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.

This device supports meter pulse applications. Meter

pulse is injected into a dedicated meter pulse input.

Injection of meter pulse onto tip and ring is controlled

by the device’s logic input pin.

Both the dc current limit and overhead voltage are

programmable. Programming may be done by exter-

nal resistors or an applied voltage source. If the volt-

age source is programmable, the current limit and

overhead may be set via software control.

The device is offered with two gain options. This

allows for an optimized codec interface, with minimal

external components regardless of whether a first-

generation or a programmable third-generation

codec is used.

Telcordia Technologies

is a registered trademark of Bell Commu-

nications Research, Inc.

Lucent Technologies Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. No

rights under any patent accompany the sale of any such product(s) or information.

June 2000

PB00-044ALC

For additional information, contact your Microelectronics Group Account Manager or the following:

INTERNET: http://www.lucent.com/micro

E-MAIL: docmaster@micro.lucent.com

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1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106)

ASIA PACIFIC:Microelectronics Group, Lucent Technologies Singapore Pte. Ltd., 77 Science Park Drive, #03-18 Cintech III, Singapore 118256

Tel. (65) 778 8833, FAX (65) 777 7495

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200233 P. R. China Tel. (86) 21 6440 0468, ext. 325, FAX (86) 21 6440 0652

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Tel. (81) 3 5421 1600, FAX (81) 3 5421 1700

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ITALY: (39) 02 6608131 (Milan), SPAIN: (34) 1 807 1441 (Madrid)

Product Brief

June 2000

Short-Loop Sine Wave Ringing SLIC

L9215A/G

Application

12-3534.E MOD (F)

VBAT1BGND VBAT2 VCC AGND

CBAT1

0.1 µF

CBAT2

0.1 µF

CCC

0.1 µF

RTFLT

DCOUT

OVH

VPROG

VREF

CRT

0.1 µF

RRT

383 kΩ

LUCENT

L7591

VBAT2

FUSIBLE OR PTC

50 Ω

CF1 CF2 NSTATBRB2B1B0

CF1

0.47 µFCF2

0.1 µF

PPM

0.5 Vrms

CPPM

10 nF

RINGIN PPMIN

VITR

RCVP

RCVN

ITR

VTX

TXI

RGX

4640 Ω

VBAT1

DBAT1

VBAT2VCC

CTX

0.1 µF

CRING

0.47 µF

CONTROL

VOLTAGE

CC1

PCM

HIGHWAY

DX0

DR0

DX1

DR1

BCLK

DGND

VDD

SYNC

AND

VDD

VFXI

VFROP

VFRON

SLIC4a

SLIC3a

SLIC2a

SLIC1a

SLIC0a

CLOCK

L9215G

FROM/TO T8536

CONTROL LATCHES

NSTAT

0.1 µF

FUSIBLE OR PTC

T8536