L9218A Просмотр технического описания (PDF) - Agere -> LSI Corporation

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Компоненты Описание

производитель

L9218A

Low-Cost Line Interface

Agere -> LSI Corporation 

L9218A/G Low-Cost Line Interface

Data Sheet

November 2001

Table of Contents

Contents

Page Figures

Page

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

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

Pin Information ............................................................4

Functional Description .................................................6

Absolute Maximum Ratings (at TA = 25 °C) ................7

Recommended Operating Conditions .........................7

Electrical Characteristics .............................................8

Ring Trip Requirements ..........................................12

Test Configurations ...................................................13

Applications ...............................................................15

dc Applications....................................................... 19

Battery Feed.........................................................19

Current Limit.........................................................19

Overhead Voltage ............................................... 19

Loop Range..........................................................20

Off-Hook Detection...............................................20

Ring Trip Detection...............................................21

Longitudinal Balance.............................................. 21

ac Design ............................................................... 22

Codec Types ........................................................22

ac Interface Network ............................................22

Receive Interface .................................................22

Example 1: Real Termination (First-

Generation Codec) .............................................. 23

Example 2: Complex Termination (First-

Generation Codec) ...............................................25

Power Derating ...................................................... 27

Pin-for-Pin Compatibility with L9217/L9219 ........... 27

PCB Layout Information ............................................27

Outline Diagram.........................................................28

28-Pin PLCC .......................................................... 28

Ordering Information..................................................29

Figure 15. Ring Trip Equivalent Circuit and

Equivalent Application ........................... 21

Figure 16. ac Equivalent Circuit .............................. 23

Figure 17. Interface Circuit Using First-

Generation Codec (±5 V Battery) .......... 26

Figure 18. Interface Circuit Using First-

Generation Codec (5 V Only Codec) ..... 26

Tables

Page

Table 1.

Table 2.

Table 3.

Table 4.

Table 5.

Table 6.

Table 7.

Table 9.

Table 10.

Table 11.

Pin Descriptions ...................................... 4

Input State Coding .................................. 6

Supervision Coding ................................. 6

Power Supply .......................................... 8

2-Wire Port .............................................. 9

Analog Pin Characteristics .................... 10

ac Feed Characteristics ...................... 11

Parts List for Loop Start Application

Circuit Using T7504-Type Codec .......... 16

200 Ω + 680 Ω || 0.1 µF First-

Generation Codec Design Parameters . 17

Parts List for Loop Start Application

Circuit Using T8536-Type Codec .......... 18

Figures

Page

Figure 1. Functional Diagram...................................3

Figure 2. 28-Pin PLCC.............................................4

Figure 3. Ring Trip Circuits ....................................12

Figure 4. L9218 Basic Test Circuit.........................13

Figure 5. Metallic PSRR.........................................13

Figure 6. Longitudinal PSRR .................................13

Figure 7. Longitudinal Balance ..............................14

Figure 8. RFI Rejection ..........................................14

Figure 9. Longitudinal Impedance..........................14

Figure 10. ac Gains..................................................14

Figure 11. Basic Loop Start Application

Circuit Using T7504-Type Codec............15

Figure 12. Basic Loop Start Application

Circuit Using T8536-Type Codec............17

Figure 13. Loop Current vs. Loop Voltage ...............19

Figure 14. Off-Hook Detection Circuit ......................20

2

Agere Systems Inc.

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