ATTL7556AAU データシートの表示（PDF） - Agere -> LSI Corporation

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ATTL7556AAU

Low-Power SLICs with Battery Switch

Agere -> LSI Corporation 

L7556, L7557 Low-Power SLICs

with Battery Switch

Data Sheet

January 2000

Table of Contents

Contents

Page

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

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

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

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

Absolute Maximum Ratings ........................................ 6

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

Electrical Characteristics ............................................. 7

Ring Trip Requirements ......................................... 11

Test Configurations .................................................. 12

Applications .............................................................. 14

Design Considerations ........................................... 16

Characteristic Curves............................................. 17

dc Applications ....................................................... 20

Battery Feed......................................................... 20

Switching the Battery............................................ 20

Overhead Voltage ............................................... 21

Adjusting Overhead Voltage ................................ 21

Adjusting dc Feed Resistance.............................. 22

Loop Range.......................................................... 22

Off-Hook Detection .............................................. 22

Ring Trip Detection.............................................. 23

Ring Ground Detection........................................ 23

ac Design ............................................................... 24

First-Generation Codecs ..................................... 24

Second-Generation Codecs ................................ 24

Third-Generation Codecs .................................... 24

Selection Criteria ................................................. 24

PCB Layout Information ............................................ 26

Outline Diagram......................................................... 27

32-Pin PLCC ........................................................... 27

Ordering Information.................................................. 28

Tables

Page

Table 1. Pin Descriptions ............................................ 4

Table 2. Input State Coding ........................................ 6

Table 3. Supervision Coding ....................................... 6

Table 4. Power Supply ................................................ 7

Table 5. 2-Wire Port .................................................... 8

Table 6. Analog Pin Characteristics ............................ 9

Table 7. Uncommitted Op Amp Characteristics .......... 9

Table 8. ac Feed Characteristics .............................. 10

Table 9. Logic Inputs and Outputs ............................ 11

Table 10. Parts List for Loop Start and Ground

Start Applications ...................................... 15

Table 11. 600 Ω Design Parameters ......................... 16

Figures

Page

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

Figure 2. Pin Diagram (PLCC Chip) ........................... 4

Figure 3. Ring Trip Circuits ....................................... 11

Figure 4. Basic Test Circuit .......................................12

Figure 5. Longitudinal Balance .................................12

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

Figure 7. RFI Rejection .............................................13

Figure 8. Longitudinal Impedance ............................13

Figure 9. Metallic PSRR ...........................................13

Figure 10. ac Gains ..................................................13

Figure 11. Basic Loop Start Application Circuit

Using T7504 Type Codec ........................14

Figure 12. Ring Ground Detection Circuit .................14

Figure 13. Receive Gain and Hybrid Balance vs.

Frequency ...............................................17

Figure 14. Transmit Gain and Return Loss vs.

Frequency ...............................................17

Figure 15. Typical VCC Power Supply Rejection .......17

Figure 16. Typical VBAT Power Supply

Rejection .................................................17

Figure 17. Loop Closure Program Resistor

Selection ..................................................18

Figure 18. Ring Ground Detection Programming .....18

Figure 19. Loop Current vs. Loop Voltage ................18

Figure 20. Loop Current vs. Loop Resistance ..........18

Figure 21. Typical SLIC Power Dissipation vs.

Loop Resistance ......................................19

Figure 22. Power Derating ........................................19

Figure 23. Longitudinal Balance Resistor Mismatch

Requirements ..........................................19

Figure 24. Longitudinal Balance vs. Protection

Resistor Mismatch ...................................19

Figure 25. Loop Current vs. Loop Voltage ................20

Figure 26. SLIC 2-Wire Output Stage .......................21

Figure 27. Equivalent Circuit for Adjusting the Over-

head Voltage ...........................................21

Figure 28. Equivalent Circuit for Adjusting the dc

Feed Resistance ......................................22

Figure 29. Adjusting Both Overhead Voltage and dc

Feed Resistance .....................................22

Figure 30. Off-Hook Detection Circuit

Applications .............................................22

Figure 31. Ring Trip Equivalent Circuit and

Equivalent Application .............................23

Figure 32. ac Equivalent Circuit Not Including Spare

Op Amp ...................................................25

Figure 33. ac Equivalent Circuit Including Spare

Op Amp ...................................................25

2

Lucent Technologies Inc.

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