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Agere Systems

L9214A Datasheet Preview

L9214A Datasheet

Low-Cost Ringing SLIC

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Preliminary Data Sheet
October 2001
L9214A/G
Low-Cost Ringing SLIC
Introduction
The Agere Systems Inc. L9214 is a subscriber line
interface circuit that is optimized to provide a very
low-cost solution for short- and medium-loop 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
s Low-cost solution
s Onboard ringing generation with software adjust-
able crest factor switching
s Flexible VCC options:
— 3.3 V or 5 V VCC
— No –5 V required
s Power control options:
— Power control resistor
— Automatic 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
— Ring mode
— Disconnect mode
s Low on-hook power:
— 25 mW scan mode
— 165 mW active mode
s Two SLIC gain options to minimize external com-
ponents in codec interface
s Loop start, ring trip, and ground key detectors
s Programmable current limit
s On-hook and scan mode line voltage clamp
s Thermal protection
s 48-pin MLCC, 32-pin PLCC, and 28-pin SOG
(Please contact your Agere Sales Representative
for availability) packages
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 PBX
s Key Systems
Description
This device is optimized to provide battery feed, ring-
ing, and supervision on short- and medium-loop plain
old telephone service (POTS) loops. Supported
round trip loop length is up to 1000 .
This device provides power ring to the subscriber by
the use of line reversal to create either a sine wave
ringing signal with a PWM input or a trapezoidal ring-
ing signal with a selectable crest factor from a square
wave input. It provides forward and reverse battery
feed states, on-hook transmission, a low-power scan
state, and a forward disconnect state.
The device requires a VCC and line feed battery to
operate. VCC may be either a 3.3 V or a 5 V supply.
The ringing signal is derived from the high-voltage
battery. An automatic battery switch is included to
allow for use of a second lower voltage battery in the
off-hook mode, thus minimizing short-loop off-hook
power consumption and dissipation. If the user
desires single battery operation, a power resistor is
required to reduce the power dissipation in the SLIC.
Loop closure, ring trip, and ground key detectors are
available. The loop closure detector has a fixed
threshold with hysteresis. The ring trip detector and
ground key detector threshold and time constants are
externally set.
The dc current limit is programmed by an external
resistor, the maximum current limit determined by the
Vcc supply.
The overhead voltage for this device is fixed and the
device is capable of supporting 3.17 dB into a 600
load with minimal overhead.
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

L9214A Datasheet Preview

L9214A Datasheet

Low-Cost Ringing SLIC

No Preview Available !

L9214A/G
Low-Cost Ringing SLIC
Preliminary Data Sheet
October 2001
Table of Contents
Contents
Page Contents
Page
Introduction ..................................................................1
Features ....................................................................1
Applications...............................................................1
Description ................................................................1
Features ......................................................................4
Description...................................................................4
Architecture Diagram...................................................7
Pin Information ............................................................8
Operating States........................................................12
State Definitions ........................................................12
Forward Active (Fast Polarity Reversal) .................12
Off-hook................................................................12
On-hook................................................................12
Forward Active (Slow Polarity Reversal).................12
Off-hook................................................................12
On-hook................................................................12
Reverse Active (Fast Polarity Reversal) .................13
Off-hook................................................................13
On-hook................................................................13
Reverse Active (Slow Polarity Reversal) ................13
Off-hook................................................................13
On-hook................................................................13
Scan ........................................................................13
Disconnect ..............................................................13
Ring.........................................................................13
Thermal Shutdown..................................................13
Absolute Maximum Ratings.......................................14
Electrical Characteristics ...........................................15
Test Configurations ...................................................22
Applications ...............................................................24
Power Control .........................................................24
dc Loop Current Limit..............................................25
Overhead Voltage ...................................................25
Active Mode .........................................................25
Scan Mode ...........................................................25
On-Hook Transmission Mode...............................25
Ring Mode............................................................26
Loop Range ........................................................... 26
Battery Reversal Rate ............................................ 26
Supervision............................................................... 27
Loop Closure.......................................................... 27
Ring Trip ................................................................ 27
Tip or Ring Ground Detector .................................. 27
Power Ring ............................................................ 27
Periodic Pulse Metering (PPM) ................................ 29
ac Applications ......................................................... 29
ac Parameters........................................................ 29
Codec Types .......................................................... 29
First-Generation Codecs ..................................... 29
Third-Generation Codecs .................................... 29
ac Interface Network .............................................. 29
Design Examples ................................................... 30
First-Generation Codec ac Interface
NetworkResistive Termination ...................... 30
Example 1, Real Termination .............................. 31
First-Generation Codec ac Interface
NetworkComplex Termination ....................... 34
Complex Termination Impedance Design
Example............................................................ 34
ac Interface Using First-Generation Codec ......... 33
Transmit Gain...................................................... 35
Receive Gain....................................................... 36
Hybrid Balance .................................................... 36
Blocking Capacitors............................................. 37
Third-Generation Codec ac Interface
NetworkComplex Termination ....................... 40
Outline Diagram........................................................ 41
28-Pin SOG............................................................ 42
32-Pin PLCC .......................................................... 43
48-Pin MLCC.......................................................... 44
48-Pin MLCC, JEDEC MO-220 VKKD-2................ 45
Ordering Information................................................. 46
2 Agere Systems Inc.


Part Number L9214A
Description Low-Cost Ringing SLIC
Maker Agere Systems
Total Page 30 Pages
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