Data Sheet
September 2001
L9215A/G
Short-Loop Sine Wave Ringing SLIC
Applications
Introduction
■ Voice over Internet Protocol (VoIP)
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 (includ-
ing 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 mini-
mize external components required at all device
interfaces.
■ Cable Modems
■ Terminal Adapters (TA)
■ Wireless Local Loop (WLL)
■ Telcordia Technologies™ GR-909 Access
■ Network Termination (NT)
■ Key Systems
Features
Description
■ 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
— Logic level square wave
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.
■ Flexible VCC options:
— 5 V or 3.3 V VCC
— No –5 V required
■ Battery switch to minimize off-hook power
The device requires 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.
■ 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
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.
■ Ultralow on-hook power:
— 27 mW scan mode
— 42 mW active mode
■ Two SLIC gain options to minimal external compo-
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.
nents in codec interface
■ Loop start, ring trip, and ground key detectors
■ Software- or hardware-controllable current-limit
and overhead voltage
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.
■ Meter pulse compatible
■ 32-pin PLCC package
■ 48-pin MLCC package
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.
AGERE [ AGERE SYSTEMS ]
