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P R O D U C T P R E V I E W
Document ID# 080871
Date:
Jul 18, 2006
Rev:
A
Version: 1
Distribution:
Public Document
The information in this document is Preliminary and may be changed in whole or in part without notice. Legerity makes no guarantee that the device(s) described
herein will ever be considered for commercialization or mass production. If you are considering using the proposed device(s) or doing any related design work, please
call a Legerity sales representative for current information.
Ve950 Series
Voice Over Subscriber Line Interface Circuit
Le9501
APPLICATIONS
Short/Medium Loop:
approximately 2000 ft. of 26
AWG, and 5 REN loads
Voice over IP/DSL
Integrated Access Devices,
Smart Residential Gateways,
Home Gateway/Router
Cable Telephony NIU, Set-
Top Box, Home Side Box,
Cable Modem, Cable PC
FiberFiber In The Loop
(FITL), Fiber to the Home
(FTTH)
Wireless Local Loop,
Intelligent PBX, ISDN NT1/TA
FEATURES
Built-in boost switching
power supply tracks line
voltage minimizing power
dissipation
-- Only +3.3 V and +12 V
(nominal) required
-- Wide range of input
voltages (+8 V to +40 V)
supported
Minimal external discrete
components
44-pin eTQFP package
Ringing
-- 70 Vpk into 5REN
-- 90 Vpk capable
-- Sinusoidal or trapezoidal
capability
-- DC offset support
-- Common differential
interface for both channels
World Wide
Programmability:
-- Two-wire AC impedance
-- Dual Current Limit
-- Loop closure and ring trip
thresholds
Five SLIC States, including:
-- Low power Standby state
-- Reverse Polarity
DESCRIPTION
Legerity's Ve950 series is comprised of both single- and dual-channel low cost 3.3-V
(5-V tolerable) ringing Subscriber-Line Interface Circuits (SLICs) that combine with minimal
external components to create a two-wire twisted-pair telephone interface.
The Ve950 series SLICs include five versions with various features supporting short- to
medium-loop requirements. All VE950 series SLICs have a standard differential ringing
interface compatible with a wide variety for voice codecs and broadband processors in the
industry.
Legerity's Le9501 device from Legerity's VoiceEdgeTM Ve950 series has enhanced and
optimized features to directly address the requirements of Voice over Broadband
applications. Its goal is to reduce system level costs, space, and power through higher
levels of integration, and to reduce the total cost of ownership by offering better quality of
service. The Le9501 device provides a totally configurable solution to the BORSCHT
functions. The resulting system is less complex, smaller, and denser, yet cost effective with
minimal external components.
The Le9501 device requires only two power supplies: +3.3 VDC and nominally +12 VDC.
The latter power supply can range from +8 VDC to +40 VDC, depending on the application.
A single TTL-level clock source drives an external transistor which controls the ramp
voltage that in turn feeds the switching regulator. Five programmable states are available:
Active, Reverse Polarity, Ringing, Standby, and Disconnect. The DC feed, two-wire AC
input impedance, hook-switch threshold, and ring trip threshold are programmable via
external discrete components. Binary fault detection is provided upon application of fault
conditions or thermal overload.
BLOCK DIAGRAM
2-wire to
4-wire
Conversion
Switching
Power
Supply
2-wire
Tip+Ring
Interface
Tip
Ring
Codec
Device
Le9501 Device
Differential
Codec
Interface
P R O D U C T P R E V I E W
Ve950 Series
Legerity Inc.
4509 Freidrich Lane
Austin, TX
78744-1812 512.228.5400
www.legerity.com
FEATURES
BENEFITS
Integrated Ringing SLIC device
Creates cost savings at both a system and a chip level.
Wide compatibility
Interfaces with a wide variety of codecs and DSP engines.
70 Vpk into 5REN; 90 Vpk capable
Increases Ringing loop length to meet and exceed voice
over broadband design specifications.
Built-in boost switching power supply tracks line
voltage minimizing power dissipation
Reduces power consumption, thereby increasing battery
back-up time and allowing for smaller batteries.
World wide programmability
One hardware platform enables worldwide design and
distribution through software selectable configurations.
Minimizes design complexity.
Related Literature
081208 Le9501 RSLIC Device Data Sheet*
081189 Le9500 RSLIC Device Data Sheet
081007 Le9502 RSLIC Device Data Sheet
081013 Layout Considerations for the Le77D11 and Le9502 Devices Application Note
*Contact your Legerity Sales Representative to obtain the data sheet.
Packaging and Availability
The Le9501 device is available in an Exposed 44-pin TQFP green package.
For More Information:
To find the Legerity Sales Office nearest you, or to download other documentation, go to:
www.legerity.com
For technical support, please contact Legerity Tech Support at:
techsupport@Legerity.com
or call +1 512.228.5400
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