istribution:
Public Document
™
PRODUCT
PREVIEW
Legerity, the Legerity logo, and combinations thereof, and VoicePort are trademarks of Legerity, Inc. All other
brand and product names are used for identification only and may be trademarks of their respective
companies.
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.
VE880 Series
Dual Channel Automatic Battery Switching (ABS) VoicePort™ Device
Le88221/241
APPLICATIONS
Voice enabled Cable and DSL Modems
Voice over IP/ATM - Integrated Access Devices (IAD)
Smart Residential Gateways (SRG) and Routers
Media Terminal Adapters (MTA) Standalone & Embedded
Fiber to the User/Premise/Home (FTTH/P/H), Fiber in
the Loop (FITL) Optical Network Terminals (ONT)
Wireless Local Loop (WLL), PBX, ISDN NT1/TA
Set-Top Box, Home Side Box
FEATURES
Complete BORSCHT function in a single VoicePortTM
device for two channels
— Battery Feed, Over-voltage support, integrated
Ringing, line Supervision, Codec, Hybrid (2W/4W), Test
— Small footprint package - Exposed pad 80-pin LQFP
— Minimal external discrete components required
Integrated Power Management
— Integrated high voltage switching regulator controllers
– Wide input voltage range (VSW =+3.3V to +35 V)
– Generates supplies for VBH, VBM & VBL
— Low power Idle and On-hook transmission states
Ringing
— 5 REN with pin for pin compatible 100-V (Le88221) and
120-V (Le88241) devices
— Up to 110-Vpk internal balanced sinusoidal or
trapezoidal ringing with programmable DC offset
— Unbalanced ringing for PBX trunk compatibility
(Le88241 device)
Pin selectable PCM/MPI or GCI interface
Worldwide Programmability
— Two-wire AC impedance, Balance Impedance, Gain
— DC feed voltage and current limit
— Ringing frequency, voltage and current limit
— 12 kHz and 16 kHz Metering
— Programmable loop closure and ring trip thresholds
G.711 µ-law, A-law, or 16 bit linear coding
Powerful signal generator
— Universal Caller ID generation
— Up to 4 simultaneous tones
— Automatic cadencing feature
Subscriber Loop Test/Self Test support
— Comprehensive line sensing
— Integrated self test capabilities
— Line fault detection and reporting
– Loop supervision, AC/DC faults
— Test load switch (Le88241)
Integrated 150 mW 3-V or 5-V Relay Driver
Pin-compatible wide band version available (16-kHz
sampling mode)
ORDERING INFORMATION
*Green package meets RoHS Directive 2002/95/EC of the European
Council to minimize the environmental impact of electrical equipment.
Device
Package
Le88221DLC
80-pin eLQFP (Green package*)
Le88241DLC
DESCRIPTION
Legerity's dual-channel Le88221/241 Automatic Battery
Switching (ABS) VoicePort™ device implements a dual-
channel telephone line interface by providing all the necessary
voice interface functions from the high voltage subscriber line
to the µP/DSP digital interface. The ABS device can operate
from external battery supplies, or from supplies generated by
the on chip switching regulator controllers. This device reduces
system level cost, space, and power by achieving the highest
level of voice integration possible. Designers benefit by having
a simple, cost effective, low power and dense, interface design
without sacrificing features or functionality. The programmable,
feature rich VoicePort devices provide a highly functional line
interface which meets the requirements of short and medium
loop (up to 1500 Ohms total at 1 REN) applications. Features
include: high voltage switching regulator, self-test, line test
capabilities, integrated ringing (up to 110-Vpk), worldwide
software programmability, flexible signal generator with tone
cadencing, caller ID generation and all BORSCHT functions.
These VoicePort device features are crucial for designing cost-
effective, full-featured Voice over Broadband solutions.
VOICEPORT™ DEVICE BLOCK DIAGRAM
TIPD
1
TDC
1
TAC
1
RINGD
1
RDC
1
RAC
1
RINGT
1
TIPT
1
IREF
VREF
VBL
High Voltage
Line Driver
GCI Interface
(GCI)
Microprocessor
Interface
(MPI)
PLL
Analog
Reference
PCM Interface
and Time Slot
Assigner
(PCM)
Signal
Generation
Input / Output
Voice Signal
Processing
Supervision
Processing
Signaling
Control
LFC
1
RTV
1
RSN
1
IHL
1
Switching
regulator
controllers
VBM VBH
TIPD
2
TDC
2
TAC
2
RINGD
2
RDC
2
RAC
2
RINGT
2
TIPT
2
VBL
High Voltage
Line Driver
Signal
Generation
Voice Signal
Processing
Supervision
Processing
Signaling
Control
LFC
2
RTV
2
RSN
2
IHL
2
VBM VBH
SWOUTZ
XB
PCLK/DCL
I/O2
i - I/O1i
DRA/DD
DXA/DU
FS/FSC
DOUT
4
TSCA
RST
CS/PG
DCLK/S0
DIN/S1
INT/S2
SWCMPY
SWVSY
SWISY
SWOUTY
SWCMPZ
SWVSZ
SWISZ
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