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參數(shù)資料
| 型號： | L9216A |
| 廠商： | Lineage Power |
| 英文描述： | Short-Loop Ringing SLIC with Ground Start(接地起動的短環(huán)路振鈴用戶接口) |
| 中文描述： | 短環(huán)振鈴用戶接口與地面開始（接地起動的短環(huán)路振鈴用戶接口） |
| 文件頁數(shù)： | 1/4頁 |
| 文件大小： | 237K |
| 代理商： | L9216A |
Product Brief
October 2000
L9216A/G
Short-Loop Ringing SLIC with Ground Start
Introduction
The L9216 is a subscriber line interface circuit (SLIC)
that is optimized for short-loop, power sensitive appli-
cations. 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 V
CC
supply of
3.3 V or 5 V and is designed to minimize external
components required at all device interfaces.
Features
I
Onboard ringing generation
I
Three ringing input options
— Sinewave
— PWM
— Logic level squarewave
I
Flexible V
CC
options
— 5 V or 3.3 V V
CC
— No –5 V required
I
Battery switch to minimize off-hook power
I
8 operating states
— Scan mode for minimal power dissipation
— Forward and reverse battery active
— On-hook transmission states
— Ground Start
— Ring mode
— Disconnect mode
I
Ultralow on-hook power
— 27 mW scan mode
— 41 mW active mode
I
Two SLIC gain options to minimal external compo-
nents in codec interface
I
Loop start, ring trip, and ground start detectors
I
Software controllable dual current limit option
I
28-pin PLCC package
Applications
I
Voice over Internet Protocol (VoIP)
I
Cable Modems
I
Terminal Adapters (TA)
I
Wireless Local Loop (WLL)
I
Telcordia
Technologies
* TA-909 Access
I
Network Termination (NT)
I
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
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, ground
start (tip open), and a forward disconnect state.
The device requires a V
CC
and battery to operate.
V
CC
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 start 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.
The dc current limit is set and fixed by a logic control-
lable pin. Ground or Vcc applied to this pin set the
current limit at the high or low value.
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.
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