LE79Q2243VC datasheet, PDF - EEWORLD Datasheet

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LE79Q2243VC: DescriptionPCM Codec, A/MU-Law, 1-Func, CMOS, PQFP80, MS-026, TQFP-80; CategoryWireless rf/communication Telecom circuit; File Size1MB，40 Pages; ManufacturerLegerity

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LE79Q2243VC Overview

PCM Codec, A/MU-Law, 1-Func, CMOS, PQFP80, MS-026, TQFP-80

LE79Q2243VC Parametric

Parameter Name	Attribute value
Maker	Legerity
Parts packaging code	QFP
package instruction	TFQFP,
Contacts	80
Reach Compliance Code	unknow
Law of compression and extension	A/MU-LAW
filter	YES
JESD-30 code	S-PQFP-G80
JESD-609 code	e3
length	12 mm
Humidity sensitivity level	3
Number of functions	1
Number of terminals	80
Operating mode	SYNCHRONOUS
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	TFQFP
Package shape	SQUARE
Package form	FLATPACK, THIN PROFILE, FINE PITCH
Peak Reflow Temperature (Celsius)	265
Certification status	Not Qualified
Maximum seat height	1.2 mm
Nominal supply voltage	3.3 V
surface mount	YES
technology	CMOS
Telecom integrated circuit types	PCM CODEC
Temperature level	INDUSTRIAL
Terminal surface	MATTE TIN
Terminal form	GULL WING
Terminal pitch	0.5 mm
Terminal location	QUAD
Maximum time at peak reflow temperature	NOT SPECIFIED
width	12 mm

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Quad Intelligent Subscriber Line Audio-processing Circuit

VoiceChip™ Family 790 Series

APPLICATIONS

Voice over IP/DSL

—

Integrated Access Devices (IAD),

Smart Residential Gateways (SRG), Home Gateway/

Router

Le79Q2241/2242/2243

ORDERING INFORMATION

Device

Le79Q2241VC

Le79Q2242JC

Le79Q2243VC

Package

64-pin TQFP

68-pin PLCC

80-pin TQFP

Cable Telephony

— NIU, Set-Top Box, Home Side

Box, Cable Modem, Cable PC

Fiber

— Fiber in the Loop (FITL), Fiber to the

Home (FTTH)

Wireless Local Loop, Intelligent PBX

DLC-MUX

DESCRIPTION

The Le79Q2241/2242/2243 codec, in combination with a 790

series SLIC device, implements a fourchannel 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

Le79Q2241/2242/2243codec has integrated self-test and line-

test 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.

FEATURES

High performance digital signal processor provides

programmable control of all major line card functions

–

A-law/µ-law and linear codec

– Transmit and receive gain

– Two-wire AC impedance

– Transhybrid balance

– Equalization

DC loop feeding

– Smooth or abrupt polarity reversal

Loop supervision

– Off-hook debounce circuit

– Ground-key and ring-trip filters

Ringing generation and control

Line and circuit testing

Tone generation

Metering generation at 12 kHz and 16 kHz

– Envelope shaping and level control

Modem Tone Detection

Supports most available master clock frequencies

from 512 kHz to 8.192 MHz

RELATED LITERATURE

080248 Le79231 790 Series SLIC Data Sheet

080249 Le79R241 790 Series SLIC Data Sheet

080253 Le79R251 790 Series SLIC Data Sheet

080804 Le79R2xx/Le79Q224x Chip Set User’s Guide

–

BLOCK DIAGRAM

Networks

and

Protection

VCCA

VCCD

DGND

ISLIC

VREF

Selectable PCM/MPI or GCI digital interfaces

ISLIC

ADGND

I/O

- I/O

TSCA/G

TSCB

DRA/DD

DRB

ISLIC

-P

General purpose I/O pins

+3.3 V DC operation

Exceeds LSSGR and ITU requirements

Supports external ringing with on-chip ring-trip circuit

–

Automatic or manual ring-trip modes

ISLIC

DXB

Quad ISLAC

RREF

DXA/DU

DCLK/S0

PCLK/FS

MCLK

RSHB

BATH

RSLB

BATL

RSPB

BATP

CS/RST

DIO/S1

INT

FS/DCL

External

Ringing

Sense

Resistors

Supports CallerNumber Identification (CID)

Document ID#

080250 Date:

May 23, 2003

Rev:

Version: 1

Distribution:

Public Document

TABLE OF CONTENTS

Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Related Literature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Le79Q2241/2242/2243 Device Internal Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Features of the Le79Q2241/2242/2243 Chip Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Connection Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Operating Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

DC Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Transmission and Signaling Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Transmit and Receive Paths. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Attenuation Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Group Delay Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Single Frequency Distortion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Gain Linearity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Total Distortion Including Quantizing Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Overload Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Discrimination Against Out-of-Band Input Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Spurious Out-of-Band Signals at the Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Switching Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Timing Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Microprocessor Interface Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

PCM Interface Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Master Clock Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

GCI Timing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

SLIC Device Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Application Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Line card Parts List- Internal Ringing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Line card Parts List - External Ringing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Physical Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

68-Pin PLCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

64-Pin Thin Quad Flat Pack (TQFP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

80-Pin Thin Quad Flat Pack (TQFP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Revision A to B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Revision B to C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Revision C to D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Revision D to E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Revision E to F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Revision F to G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Revision G to H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Revision H to I1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Le79Q2241/2242/2243 VoiceChip™ Family 790 Series Data Sheet

PRODUCT DESCRIPTION

The 790 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 790 series SLIC device and a Le79Q2241/2242/2243 codec. These provide the following

basic functions:

The 790 series SLIC device: A high voltage, bipolar IC that drives the subscriber line, maintains longitudinal balance and

senses line conditions.

2. The Le79Q2241/2242/2243 codec: A low voltage CMOS IC that provides conversion and DSP functions for all four channels.

Complete schematics of line cards using the Le79Q2241/2242/2243 codec for internal and external ringing are shown in

Application Circuits,

on page 30.

The 790 series SLIC device uses reliable, bipolar technology to provide the power necessary to drive a wide variety of subscriber

lines. It can be programmed by the codec to operate in eight different modes that control power consumption and signaling. This

enables it to have full control over the subscriber loop. The 790 series SLIC device is designed to be used exclusively with the

Le79Q2241/2242/2243 codec as part of a multiple-line chip set.

The 790 series SLIC 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 790 series SLIC chip by dissipating excess

power in external resistors.

Each Le79Q2241/2242/2243 codec contains high-performance codec circuits that provide A/D and D/A conversion for voice

(codec), DC-feed and supervision signals for four subscriber channels. The Le79Q2241/2242/2243 codec 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 Le79Q2241/2242/2243 codec 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 WinSLAC 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 790 series SLIC device interface unit inside the Le79Q2241/2242/2243 codec processes information regarding the line

voltages, loop currents and battery voltage levels. These inputs allow the Le79Q2241/2242/2243 codec to place several key 790

series SLIC device performance parameters under software control.

The main functions that can be observed and/or controlled through the Le79Q2241/2242/2243 codec backplane interface are:

•

DC-feed characteristics

•

Ground-key detection

•

Off-hook detection

•

Metering signal

•

Longitudinal operating point

•

Subscriber line voltage and currents

•

Ring-trip detection

•

Abrupt and smooth reversal

•

Subscriber line matching

•

Ringing generation

•

Sophisticated line and circuit tests

To accomplish these functions, the 790 series SLIC device collects the following information and feeds it, in analog form, to the

Le79Q2241/2242/2243 codec:

•

The metallic (IMT) and longitudinal (ILG) loop currents

The AC (VTX) and DC (VSAB) loop voltages

The outputs supplied by the Le79Q2241/2242/2243 codec to the 790 series SLIC device are then:

•

A voltage (VHL

*) that provides control for the following high-level 790 series SLIC device outputs:

DC loop current

Le79Q2241/2242/2243 VoiceChip™ Family 790 Series Data Sheet

•

Internal ringing signal

12 or 16 kHz metering signal

A low-level voltage proportional to the voice signal (VOUT

)

A voltage that controls longitudinal offset for test purposes (VLB

)

The Le79Q2241/2242/2243 codec 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 functions, the Le79Q2241/2242/2243 codec provides all the sensing, feedback, and clocking necessary to

completely control 790 series SLIC device functions with programmable parameters. System-level parameters under

programmable control include active loop current limits, feed resistance, and feed mode voltages.

The Le79Q2241/2242/2243 codec supplies complete mode control to the 790 series SLIC device using the control bus and (P1-

P3) tri-level load signal (LD

The Le79Q2241/2242/2243 codec 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

Le79Q2241/2242/2243 VoiceChip™ Family 790 Series Data Sheet

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