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Agere Systems

L9216G Datasheet Preview

L9216G Datasheet

Short-Loop Ringing SLIC

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Preliminary Data Sheet
September 2001
L9216A/G
Short-Loop Ringing SLIC with Ground Start
Introduction
The Agere Systems Inc. L9216 is a subscriber line
interface circuit (SLIC) that is optimized for short-
loop, power-sensitive applications. This device pro-
vides the complete set of line interface functionality,
including power ringing needed to interface to a sub-
scriber 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.
Applications
s Voice over Internet Protocol (VoIP)
s Cable Modems
s Terminal Adapters (TA)
s Wireless Local Loop (WLL)
s Telcordia TechnologiesGR-909 Access
s Network Termination (NT)
s Key Systems
Features
s Onboard ringing generation
s Three ringing input options:
— Sine wave
— PWM
— Logic level square wave
s Flexible VCC options:
— 5 V or 3.3 V VCC
— No –5 V required
s Battery switch to minimize off-hook power
s Eight operating states:
— Scan mode for minimal power dissipation
— Forward and reverse battery active
— On-hook transmission states
— Ground start (tip open)
— Ring mode
— Disconnect mode
s Ultralow on-hook power:
— 27 mW scan mode
— 41 mW active mode
s Two SLIC gain options to minimal external compo-
nents in codec interface
s Loop start, ring trip, and ground start detectors
s Software-controllable dual current-limit option
s 28-pin PLCC package
s 48-pin MLCC package
Description
This device is optimized to provide battery feed, ring-
ing, and supervision on short-loop plain old tele-
phone service (POTS) loops.
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 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 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 open is applied to this pin set the
current limit at the low or high 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.




Agere Systems

L9216G Datasheet Preview

L9216G Datasheet

Short-Loop Ringing SLIC

No Preview Available !

L9216A/G
Short-Loop Ringing SLIC with Ground Start
Preliminary Data Sheet
September 2001
Table of Contents
Contents
Page
Introduction ..................................................................1
Features ....................................................................1
Applications...............................................................1
Description ................................................................1
Features ......................................................................4
Description...................................................................4
Architecture Diagram...................................................7
Pin Information ............................................................8
Operating States .......................................................10
State Definitions ........................................................11
Forward Active ........................................................11
Reverse Active........................................................11
Scan ........................................................................11
On-Hook Transmission—Forward Battery ..............11
On-Hook Transmission—Reverse Battery ..............11
Disconnect ..............................................................11
Ring.........................................................................11
Ground Start ...........................................................11
Thermal Shutdown..................................................12
Absolute Maximum Ratings (@ TA = 25 °C) ..............12
Electrical Characteristics ...........................................13
Test Configurations ...................................................20
Applications ...............................................................22
Power Control .........................................................22
dc Loop Current Limit..............................................23
Overhead Voltage ...................................................23
Active Mode .........................................................23
Scan Mode ...........................................................23
On-Hook Transmission Mode...............................23
Ring Mode............................................................24
Loop Range ............................................................24
Battery Reversal Rate .............................................24
Supervision ................................................................24
Loop Closure...........................................................24
Ring Trip .................................................................24
Tip or Ring Ground Detector ...................................24
Power Ring .............................................................25
Sine Wave Input Signal and Sine Wave
Power Ring Signal Output .................................26
PWM Input Signal and Sine Wave Power
Ring Signal Output.............................................28
5 V VCC Operation ................................................29
3.3 V VCC Operation .............................................30
Square Wave Input Signal and Trapezoidal
Power Ring Signal Output .................................30
Contents
Page
ac Applications ......................................................... 32
ac Parameters........................................................ 32
Codec Types .......................................................... 32
First-Generation Codecs ..................................... 32
Third-Generation Codecs .................................... 32
ac Interface Network .............................................. 32
Design Examples ................................................... 34
First-Generation Codec ac Interface
Network—Resistive Termination ...................... 34
Example 1, Real Termination .............................. 34
First-Generation Codec ac Interface
Network—Complex Termination ....................... 37
Complex Termination Impedance Design
Example............................................................ 37
ac Interface Using First-Generation Codec ......... 37
Transmit Gain...................................................... 38
Receive Gain....................................................... 39
Hybrid Balance .................................................... 39
Blocking Capacitors ............................................ 40
Third-Generation Codec ac Interface
Network—Complex Termination ....................... 42
Outline Diagrams...................................................... 44
28-Pin PLCC .......................................................... 44
48-Pin MLCC.......................................................... 45
48-Pin MLCC, JEDEC MO-220 VKKD-2................ 46
Ordering Information ................................................ 47
2 Agere Systems Inc.


Part Number L9216G
Description Short-Loop Ringing SLIC
Maker Agere Systems
Total Page 30 Pages
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