LE79Q2281DVCT

LE79Q2281DVCT Datasheet

Le79228

Part	Datasheet
LE79Q2281DVCT	LE79Q2281DVCT (pdf)

Related Parts	Information
LE79Q2281DVC	LE79Q2281DVC
LE79Q2284MVCT	LE79Q2284MVCT
LE79Q2284MVC	LE79Q2284MVC

PDF Datasheet Preview
Le79228 Quad Intelligent Subscriber Line Audio-processing Circuit Voice Solution VE790 Series - Voice over IP/DSL Integrated Access Devices IAD , Smart Residential Gateways SRG , Home Gateway/ Router - Cable Telephony NIU, Set-Top Box, Home Side Box, Cable Modem, Cable PC - Fiber in the Loop FITL , Fiber to the Home FTTH - Wireless Local Loop, Intelligent PBX - DLC-MUX - CO ORDERING INFORMATION Device Le79Q2281DVC Le79Q2284MVC Package1 64-pin TQFP Green 80-pin LQFP Green Packing2 Tray The green package meets RoHS Directive 2002/95/EC of the European Council to minimize the environmental impact of electrical equipment. For delivery using a tape and reel packing system, add a "T" suffix to the OPN Ordering Part Number when placing an order. - High performance digital signal processor provides programmable control of all major line card functions A-law/µ-law and linear codec/filter Transmit and receive gain Two-wire AC impedance Transhybrid balance Equalization Loop supervision Off-hook debounce circuit Ground-key and ring-trip filters Internal ringing generation and integrated ring-trip detection Adaptive hybrid balance Line and circuit testing Meets GR-909 and GR-844 test requirements Tone generation DTMF, FSK, random noise, and arbitrary tone Metering generation at 12 kHz and 16 kHz Envelope shaping and level control Modem Tone Detection - Selectable PCM/MPI or GCI digital interfaces Supports most available master clock frequencies from 512 kHz to MHz - General purpose I/O pins - V DC operation - Exceeds LSSGR and ITU requirements - Supports external ringing with on-chip ring-trip circuit Automatic or manual ring-trip modes - Supports CallerNumber Identification CID tone generation The Le79228 Quad Intelligent Subscriber Line Audioprocessing Circuit ISLAC device, in combination with a VE790 series ISLIC device, implements a four-channel universal telephone line interface. This enables the design of a single, low cost, high performance, fully software programmable line interface for multiple country applications. All AC, DC, and signaling parameters are fully programmable via microprocessor or GCI interfaces. Additionally, the Le79228 Quad ISLAC device has integrated self-test and linetest capabilities to resolve faults to the line or line circuit. The integrated test capability is crucial for remote applications where dedicated test hardware is not cost effective. RELATED LITERATURE - 081237 Le79232 Dual ISLIC Device Data Sheet - 081152 Le79242 Dual ISLIC Device Data Sheet - 081185 Le79252 Dual ISLIC Device Data Sheet - 081191 Le75282 Dual LCAS Device Data Sheet - 080923 Le792x2 Le79228 Chip Set User’s Guide - 081151 Le79112 VCP Device Data Sheet BLOCK DIAGRAM Dual ISLIC A2 Protection and LCAS or EMR for External Ringing B3 Dual ISLIC LD1 LD2 VREF AGND P1-P3 LD3 LD4 Quad ISLAC VCCA VCCD DGND I/O1 - I/O4 TSCA/G TSCB DRA/DD DRB DXB RREF DXA/DU External Ringing Sense Resistors DCLK/S0 PCLK/FS MCLK BATH BATL RSHB RSLB FS/DCL CS/RST DIO/S1 Applications Features Ordering Information Description. Related Literature Block Diagram Product Description Optional VCP Features Zarlink Semiconductor Inc. Le79228 Data Sheet PRODUCT DESCRIPTION The VE790 series voice chip sets integrate all functions of the subscriber line for four subscriber lines. One or more of two chip types are used to implement the line card a VE790 series ISLIC device and a Le79228 Quad ISLAC device. These provide the following basic functions: The VE790 series ISLIC device A high voltage, bipolar IC that drives the subscriber line, maintains longitudinal balance and senses line conditions. The Le79228 Quad ISLAC device A low voltage CMOS IC that provides conversion and DSP functions for all four channels. Complete schematics of line cards using the Le79228 Quad ISLAC device for internal and external ringing are shown in Application Circuits, on page The VE790 series ISLIC device uses reliable, bipolar technology to provide the power necessary to drive a wide variety of subscriber lines. It can be programmed by the Quad ISLAC device to operate in eight different modes that control power consumption and signaling. This enables it to have full control over the subscriber loop. The VE790 series ISLIC device is designed to be used exclusively with the Le79228 Quad ISLAC device as part of a multiple-line chip set. The VE790 series ISLIC device implements a linear loop-current feeding method with the enhancement of intelligent thermal management in a controlled manner. This limits the amount of power dissipated on the VE790 series ISLIC chip by dissipating excess power in external resistors. Each Le79228 Quad ISLAC device contains high-performance analog circuits that provide A/D and D/A conversion for voice codec/filter , DC-feed and supervision signals for four subscriber channels. The Le79228 Quad ISLAC device contains a DSP core that handles signaling, DC-feed, supervision and line diagnostics for all four channels. The DSP core selectively interfaces with three types of backplanes: • Standard PCM/MPI • Standard GCI • Modified GCI with a single analog line per GCI channel The Le79228 Quad ISLAC device provides a complete software configurable solution to the BORSCHT functions as well as complete programmable control over subscriber line DC-feed characteristics, such as current limit and feed resistance. In addition, these chip sets provide system level solutions for the loop supervisory functions and metering. In total, they provide a programmable solution that can satisfy worldwide line card requirements by software configuration. Software programmed filter coefficients, DC-feed data and supervision data are easily calculated with the software. This PC software is provided free of charge and allows the designer to enter a description of system requirements. WinSLAC then computes the necessary coefficients and plots the predicted system results. The VE790 series ISLIC device interface unit inside the Le79228 Quad ISLAC device processes information regarding the line voltages, loop currents and battery voltage levels. These inputs allow the Le79228 Quad ISLAC device to place several key VE790 series ISLIC device performance parameters under software control. The main functions that can be observed and/or controlled through the Le79228 Quad ISLAC device backplane interface are: • The metallic IMT and longitudinal ILG loop currents • The AC VTX and DC VSAB loop voltages The outputs supplied by the Le79228 Quad ISLAC device to the VE790 series ISLIC device are then • A voltage VHLi* that provides control for the following high-level VE790 series ISLIC device outputs • DC loop current Zarlink Semiconductor Inc. Le79228 Data Sheet • Internal ringing signal • 12- or 16-kHz metering signal • A low-level voltage proportional to the voice signal VOUTi • A voltage that controls longitudinal offset for test purposes VLBi The Le79228 Quad ISLAC device performs the codec and filter functions associated with the four-wire section of the subscriber line circuitry in a digital switch. These functions involve converting an analog voice signal into digital PCM samples and converting digital PCM samples back into an analog signal. During conversion, digital filters are used to band-limit the voice signals. The user-programmable filters set the receive and transmit gain, perform the transhybrid balancing function, permit adjustment of the two-wire termination impedance and provide frequency attenuation adjustment equalization of the receive and transmit paths. Transhybrid balancing is also included. All programmable digital filter coefficients can be calculated using WinSLAC software. The PCM codes can be either 16-bit linear two’s-complement or 8-bit companded A-law or µ-law. Besides the codec/filter functions, the Le79228 Quad ISLAC device provides all the sensing, feedback, and clocking necessary to completely control VE790 series ISLIC device functions with programmable parameters. System-level parameters under programmable control include active loop current limits, feed resistance, and feed mode voltages. The Le79228 Quad ISLAC device supplies complete mode control to the VE790 series ISLIC device using the control bus and P1-P3 tri-level load signal LDi . The Le79228 Quad ISLAC device provides extensive loop supervision capability including off-hook, ring-trip and ground-key detection. Detection thresholds for these functions are programmable. A programmable debounce timer is available that eliminates false detection due to contact bounce. For subscriber line diagnostics, AC and DC line conditions can be monitored using built in test tools. Measured parameters can be compared to programmed threshold levels to set a pass/fail bit. The user can choose to send the actual PCM measurement data directly to a higher level processor by way of the voice channel. Both longitudinal and metallic resistance and capacitance can be measured, which allows leakage resistance, line capacitance, and telephones to be identified. *Note "i" denotes channel number OPTIONAL VCP FEATURES Optional Voice Control Processor VCP features provide the following solutions to the VE790 series intelligent chip sets • Integrated test software routines • DTMF detection • Aggregated codec/filter control Zarlink Semiconductor Inc. Le79228 Quad ISLAC Device Internal Block Diagram 80-Pin LQFP Data Sheet VHL1 VLB1 VOUT1 VIN1 VSAB1 VIMT1 VILG1 GS1 GS2 XSB1 Ch 1 Converter Block Ch 2 Same as Ch 1 Ch 3 Same as Ch 1 Ch 4 Same as Ch 1 Digital Signal Processor IREF VREF Clock and Reference parameters, changed max from 50 to 35 ns. • Updated Application Circuits, VHL Networks, and Line Card Parts List. • Minor text and table changes. • Changed Le792284 OPN from Le79Q2284FVC to Le79Q2284MVC to reflect package change from TQFP to LQFP. • Minor edit to schematics. • Line Card Parts List - External Ringing, changed U4i from 95 V TISP4095H3 protector to 250 V TISP4250H3 protector. • Physical Dimensions, replaced 80-pin TQFP with 80-pin LQFP. • Page 21, PCM Interface, output loading added. DXA and DXB loading changed from 150 pF to 80 pF. • Updated Figure 19, on page • Updated Figure 21, on page • Updated Line card Parts List- INTERNAL RINGING, on page • Updated Line card Parts List - EXTERNAL RINGING, on page • Enhanced format of package drawings in Physical Dimensions, on page 35 • Added new headers/footers due to Zarlink purchase of Legerity on August 3, 2007 Zarlink Semiconductor Inc. For more information about all Zarlink products visit our Web Site at: Information relating to products and services furnished herein by Zarlink Semiconductor Inc. trading as Zarlink Semiconductor or its subsidiaries collectively “Zarlink” is believed to be reliable. However, Zarlink assumes no liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or use. Neither the supply of such information or purchase of product or service conveys any license, either express or implied, under patents or other intellectual property rights owned by Zarlink or licensed from third parties by Zarlink, whatsoever. Purchasers of products are also hereby notified that the use of product in certain ways or in combination with Zarlink, or non-Zarlink furnished goods or services may infringe patents or other intellectual property rights owned by Zarlink. This publication is issued to provide information only and unless agreed by Zarlink in writing may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. The products, their specifications, services and other information appearing in this publication are subject to change by Zarlink without notice. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user’s responsibility to fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. Manufacturing does not necessarily include testing of all functions or parameters. These products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. All products and materials are sold and services provided subject to Zarlink’s conditions of sale which are available on request. Purchase of Zarlink’s I2C components conveys a licence under the Philips I2C Patent rights to use these components in an I2C System, provided that the system conforms to the I2C Standard Specification as defined by Philips. Zarlink, ZL, the Zarlink Semiconductor logo are trademarks, and Legerity, the Legerity logo and combinations thereof are registered trademarks of Zarlink Semiconductor Inc. All other trademarks and registered trademarks are the property of their respective owners. 2007 Zarlink Semiconductor Inc. All Rights Reserved. TECHNICAL DOCUMENTATION - NOT FOR RESALE

PDF Datasheet Preview

Le79228

Quad Intelligent Subscriber Line Audio-processing Circuit

Voice Solution

VE790 Series
- Voice over IP/DSL Integrated Access Devices IAD , Smart Residential Gateways SRG , Home Gateway/ Router
- Cable Telephony NIU, Set-Top Box, Home Side Box, Cable Modem, Cable PC
- Fiber in the Loop FITL , Fiber to the Home FTTH
- Wireless Local Loop, Intelligent PBX - DLC-MUX - CO
ORDERING INFORMATION

Device Le79Q2281DVC Le79Q2284MVC

Package1 64-pin TQFP Green 80-pin LQFP Green

Packing2 Tray

The green package meets RoHS Directive 2002/95/EC of the European Council to minimize the environmental impact of electrical equipment.
For delivery using a tape and reel packing system, add a "T" suffix to the OPN Ordering Part Number when placing an order.
- High performance digital signal processor provides programmable control of all major line card functions

A-law/µ-law and linear codec/filter Transmit and receive gain Two-wire AC impedance Transhybrid balance Equalization

Loop supervision Off-hook debounce circuit Ground-key and ring-trip filters

Internal ringing generation and integrated ring-trip detection

Adaptive hybrid balance Line and circuit testing

Meets GR-909 and GR-844 test requirements Tone generation DTMF, FSK, random noise, and
arbitrary tone Metering generation at 12 kHz and 16 kHz

Envelope shaping and level control Modem Tone Detection - Selectable PCM/MPI or GCI digital interfaces

Supports most available master clock frequencies from 512 kHz to MHz
- General purpose I/O pins - V DC operation - Exceeds LSSGR and ITU requirements - Supports external ringing with on-chip ring-trip circuit

Automatic or manual ring-trip modes - Supports CallerNumber Identification CID tone
generation

The Le79228 Quad Intelligent Subscriber Line Audioprocessing Circuit ISLAC device, in combination with a VE790 series ISLIC device, implements a four-channel universal telephone line interface. This enables the design of a single, low cost, high performance, fully software programmable line interface for multiple country applications. All AC, DC, and signaling parameters are fully programmable via microprocessor or GCI interfaces. Additionally, the Le79228 Quad ISLAC device has integrated self-test and linetest capabilities to resolve faults to the line or line circuit. The integrated test capability is crucial for remote applications where dedicated test hardware is not cost effective.

RELATED LITERATURE
- 081237 Le79232 Dual ISLIC Device Data Sheet - 081152 Le79242 Dual ISLIC Device Data Sheet - 081185 Le79252 Dual ISLIC Device Data Sheet - 081191 Le75282 Dual LCAS Device Data Sheet - 080923 Le792x2 Le79228 Chip Set User’s Guide - 081151 Le79112 VCP Device Data Sheet

BLOCK DIAGRAM

Dual ISLIC A2

Protection
and LCAS or

EMR for

External Ringing

B3 Dual ISLIC

LD1 LD2 VREF

AGND

P1-P3 LD3 LD4

Quad ISLAC

VCCA VCCD

DGND

I/O1 - I/O4 TSCA/G TSCB DRA/DD

DRB DXB

RREF

DXA/DU

External

Ringing

Sense

Resistors

DCLK/S0 PCLK/FS MCLK

BATH BATL

RSHB RSLB

FS/DCL CS/RST DIO/S1
Applications Features Ordering Information Description. Related Literature Block Diagram Product Description Optional VCP Features

Zarlink Semiconductor Inc.

Le79228

Data Sheet

PRODUCT DESCRIPTION

The VE790 series voice chip sets integrate all functions of the subscriber line for four subscriber lines. One or more of two chip types are used to implement the line card a VE790 series ISLIC device and a Le79228 Quad ISLAC device. These provide the following basic functions:

The VE790 series ISLIC device A high voltage, bipolar IC that drives the subscriber line, maintains longitudinal balance and senses line conditions.

The Le79228 Quad ISLAC device A low voltage CMOS IC that provides conversion and DSP functions for all four channels. Complete schematics of line cards using the Le79228 Quad ISLAC device for internal and external ringing are shown in Application Circuits, on page

The VE790 series ISLIC device uses reliable, bipolar technology to provide the power necessary to drive a wide variety of subscriber lines. It can be programmed by the Quad ISLAC device to operate in eight different modes that control power consumption and signaling. This enables it to have full control over the subscriber loop. The VE790 series ISLIC device is designed to be used exclusively with the Le79228 Quad ISLAC device as part of a multiple-line chip set.

The VE790 series ISLIC device implements a linear loop-current feeding method with the enhancement of intelligent thermal management in a controlled manner. This limits the amount of power dissipated on the VE790 series ISLIC chip by dissipating excess power in external resistors.

Each Le79228 Quad ISLAC device contains high-performance analog circuits that provide A/D and D/A conversion for voice codec/filter , DC-feed and supervision signals for four subscriber channels. The Le79228 Quad ISLAC device contains a DSP core that handles signaling, DC-feed, supervision and line diagnostics for all four channels.

The DSP core selectively interfaces with three types of backplanes:
• Standard PCM/MPI
• Standard GCI
• Modified GCI with a single analog line per GCI channel The Le79228 Quad ISLAC device provides a complete software configurable solution to the BORSCHT functions as well as complete programmable control over subscriber line DC-feed characteristics, such as current limit and feed resistance. In addition, these chip sets provide system level solutions for the loop supervisory functions and metering. In total, they provide a programmable solution that can satisfy worldwide line card requirements by software configuration.

Software programmed filter coefficients, DC-feed data and supervision data are easily calculated with the software. This PC software is provided free of charge and allows the designer to enter a description of system requirements. WinSLAC then computes the necessary coefficients and plots the predicted system results.

The VE790 series ISLIC device interface unit inside the Le79228 Quad ISLAC device processes information regarding the line voltages, loop currents and battery voltage levels. These inputs allow the Le79228 Quad ISLAC device to place several key VE790 series ISLIC device performance parameters under software control.

The main functions that can be observed and/or controlled through the Le79228 Quad ISLAC device backplane interface are:
• The metallic IMT and longitudinal ILG loop currents
• The AC VTX and DC VSAB loop voltages

The outputs supplied by the Le79228 Quad ISLAC device to the VE790 series ISLIC device are then
• A voltage VHLi* that provides control for the following high-level VE790 series ISLIC device outputs
• DC loop current

Zarlink Semiconductor Inc.

Le79228

Data Sheet
• Internal ringing signal
• 12- or 16-kHz metering signal
• A low-level voltage proportional to the voice signal VOUTi
• A voltage that controls longitudinal offset for test purposes VLBi The Le79228 Quad ISLAC device performs the codec and filter functions associated with the four-wire section of the subscriber line circuitry in a digital switch. These functions involve converting an analog voice signal into digital PCM samples and converting digital PCM samples back into an analog signal. During conversion, digital filters are used to band-limit the voice signals.

The user-programmable filters set the receive and transmit gain, perform the transhybrid balancing function, permit adjustment of the two-wire termination impedance and provide frequency attenuation adjustment equalization of the receive and transmit paths. Transhybrid balancing is also included. All programmable digital filter coefficients can be calculated using WinSLAC software. The PCM codes can be either 16-bit linear two’s-complement or 8-bit companded A-law or µ-law.

Besides the codec/filter functions, the Le79228 Quad ISLAC device provides all the sensing, feedback, and clocking necessary to completely control VE790 series ISLIC device functions with programmable parameters. System-level parameters under programmable control include active loop current limits, feed resistance, and feed mode voltages.

The Le79228 Quad ISLAC device supplies complete mode control to the VE790 series ISLIC device using the control bus and P1-P3 tri-level load signal LDi . The Le79228 Quad ISLAC device provides extensive loop supervision capability including off-hook, ring-trip and ground-key detection. Detection thresholds for these functions are programmable. A programmable debounce timer is available that eliminates false detection due to contact bounce.

For subscriber line diagnostics, AC and DC line conditions can be monitored using built in test tools. Measured parameters can be compared to programmed threshold levels to set a pass/fail bit. The user can choose to send the actual PCM measurement data directly to a higher level processor by way of the voice channel. Both longitudinal and metallic resistance and capacitance can be measured, which allows leakage resistance, line capacitance, and telephones to be identified.
*Note "i" denotes channel number

OPTIONAL VCP FEATURES

Optional Voice Control Processor VCP features provide the following solutions to the VE790 series intelligent chip sets
• Integrated test software routines
• DTMF detection
• Aggregated codec/filter control

Zarlink Semiconductor Inc.

Le79228 Quad ISLAC Device Internal Block Diagram 80-Pin LQFP

Data Sheet

VHL1 VLB1 VOUT1 VIN1 VSAB1 VIMT1 VILG1 GS1 GS2 XSB1

Ch 1 Converter

Block

Ch 2 Same as Ch 1

Ch 3 Same as Ch 1

Ch 4 Same as Ch 1

Digital Signal Processor

IREF VREF

Clock and Reference
parameters, changed max from 50 to 35 ns.
• Updated Application Circuits, VHL Networks, and Line Card Parts List.
• Minor text and table changes.
• Changed Le792284 OPN from Le79Q2284FVC to Le79Q2284MVC to reflect package change from TQFP to LQFP.
• Minor edit to schematics.
• Line Card Parts List - External Ringing, changed U4i from 95 V TISP4095H3 protector to 250 V TISP4250H3 protector.
• Physical Dimensions, replaced 80-pin TQFP with 80-pin LQFP.
• Page 21, PCM Interface, output loading added. DXA and DXB loading changed from 150 pF to 80 pF.
• Updated Figure 19, on page
• Updated Figure 21, on page
• Updated Line card Parts List- INTERNAL RINGING, on page
• Updated Line card Parts List - EXTERNAL RINGING, on page
• Enhanced format of package drawings in Physical Dimensions, on page 35
• Added new headers/footers due to Zarlink purchase of Legerity on August 3, 2007

Zarlink Semiconductor Inc.

For more information about all Zarlink products visit our Web Site at:

Information relating to products and services furnished herein by Zarlink Semiconductor Inc. trading as Zarlink Semiconductor or its subsidiaries collectively “Zarlink” is believed to be reliable. However, Zarlink assumes no liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or use. Neither the supply of such information or purchase of product or service conveys any license, either express or implied, under patents or other intellectual property rights owned by Zarlink or licensed from third parties by Zarlink, whatsoever. Purchasers of products are also hereby notified that the use of product in certain ways or in combination with Zarlink, or non-Zarlink furnished goods or services may infringe patents or other intellectual property rights owned by Zarlink.

This publication is issued to provide information only and unless agreed by Zarlink in writing may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. The products, their specifications, services and other information appearing in this publication are subject to change by Zarlink without notice. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user’s responsibility to fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. Manufacturing does not necessarily include testing of all functions or parameters. These products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. All products and materials are sold and services provided subject to Zarlink’s conditions of sale which are available on request.

Purchase of Zarlink’s I2C components conveys a licence under the Philips I2C Patent rights to use these components in an I2C System, provided that the system conforms to the I2C Standard Specification as defined by Philips. Zarlink, ZL, the Zarlink Semiconductor logo are trademarks, and Legerity, the Legerity logo and combinations thereof are registered trademarks of Zarlink Semiconductor Inc. All other trademarks and registered trademarks are the property of their respective owners. 2007 Zarlink Semiconductor Inc. All Rights Reserved.

TECHNICAL DOCUMENTATION - NOT FOR RESALE

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived LE79Q2281DVCT Datasheet file may be downloaded here without warranties.

Datasheet ID: LE79Q2281DVCT 648985