LUCL8560DAU-DT datasheet(2/46 Pages) AGERE

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LUCL8560DAU-DT Datasheet(PDF) 2 Page - Agere Systems

Part #	LUCL8560DAU-DT

Description	Low-Power SLIC with Ringing

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Manufacturer	AGERE [Agere Systems]

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Data Sheet

April 2000

L8560 Low-Power SLIC with Ringing

Lucent Technologies Inc.

Table of Contents

Contents

Page

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

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

Pin Information ........................................................... 6

Functional Description ................................................ 9

Absolute Maximum Ratings ..................................... 10

Recommended Operating Conditions ...................... 11

Electrical Characteristics .......................................... 11

Ring Trip Requirements ......................................... 16

Test Configurations .................................................. 17

Applications ............................................................. 19

Characteristic Curves............................................. 19

dc Applications ...................................................... 21

Battery Feed...................................................... 21

Overhead Voltage ............................................ 22

Adjusting Overhead Voltage ............................. 23

Adjusting dc Feed Resistance........................... 23

Adjusting Overhead Voltage and dc Feed

Resistance Simultaneously.............................. 24

Loop Range....................................................... 24

Off-Hook Detection ........................................... 24

Ring Ground Detection...................................... 25

Longitudinal Balance.............................................. 25

Power Derating ..................................................... 25

Battery Switch ....................................................... 26

VCC/VEE Supplies ................................................... 27

Power Ringing ....................................................... 27

Ringing SLIC Balanced Ring Signal

Generation ....................................................... 27

POTS for ISDN Terminal Adapters ................... 27

Contents

Page

Power Ringing Load .......................................... 28

Crest Factor....................................................... 28

Current-Limit Switch .......................................... 29

Ring Trip ............................................................ 29

Reference Designs for ISDN TA Applications ... 31

Design Considerations .......................................... 33

Unbalanced Bused Ring Signal Application ...... 33

Ring Trip Detection............................................ 33

ac Design .............................................................. 37

First-Generation Codecs ................................... 37

Second-Generation Codecs .............................. 37

Third-Generation Codecs .................................. 37

Design Examples ................................................... 39

Example 1, Real Termination ............................ 39

Example 2, Complex Termination ..................... 39

Example 3, Complex Termination Without

Spare Op Amp ................................................. 39

Complex Termination Impedance Design

Example Using L8560 Without Spare

Op Amp ............................................................ 40

ac Interface Using First-Generation Codec ....... 40

Transmit Gain .................................................... 41

Receive Gain ..................................................... 42

Hybrid Balance .................................................. 42

Blocking Capacitors........................................... 43

Outline Diagrams...................................................... 44

32-Pin PLCC ......................................................... 44

44-Pin PLCC ......................................................... 45

Ordering Information................................................. 46

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