參數(shù)資料
型號(hào)： L7557
廠商： Lineage Power
英文描述： Low-Power SLICs （electronic subscriber loop interface circuits ）with Battery Switch(帶電池開(kāi)關(guān)的低功耗用戶環(huán)路線接口電路（SLIC）)
中文描述： 低功耗SLIC組件（電子用戶環(huán)路接口電路）與電池開(kāi)關(guān)（帶電池開(kāi)關(guān)的低功耗用戶環(huán)路線接口電路電路（SLIC））
文件頁(yè)數(shù)： 2/28頁(yè)
文件大?。?/td> 753K
代理商： L7557
2
Lucent Technologies Inc.
Data Sheet
January 2000
with Battery Switch
L7556, L7557 Low-Power SLICs
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
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 V
CC
Power Supply Rejection .......17
Figure 16. Typical V
BAT
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
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