L9219G データシートの表示（PDF） - Agere -> LSI Corporation

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L9219G

Low-Cost Line Interface with Reverse Battery and Dual Current Limit

Agere -> LSI Corporation 

L9219A/G Low-Cost Line Interface

with Reverse Battery and Dual Current Limit

Data Sheet

November 2001

Table of Contents

Contents

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

Rate of Battery Reversal ......................................20

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/L9218 ............27

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

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

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

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

Figures

Page

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

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

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 8.

Table 9.

Table 10.

Table 11.

Table 12.

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

Logic Inputs and Outputs ...................... 12

Parts List for Loop Start Application

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

200 W + 680 W || 0.1 mF First-

Generation Codec Design Parameters . 17

Parts List for Loop Start Application

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

FB1/FB2 Values vs. Typical Ramp

Time ...................................................... 20

Figures

Page

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

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

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

Figure 4. L9219 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

2

Agere Systems Inc.

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