Data Sheet
April 2000
Lucent Technologies Inc.
3
L8560 Low-Power SLIC with Ringing
Table of Contents
(continued)
Figures
Page
Figure 1. Functional Diagram ..................................... 5
Figure 2. 32-Pin Diagram (PLCC Chip)...................... 6
Figure 3. 44-Pin Diagram (PLCC Chip)...................... 6
Figure 4. Ring Trip Circuits....................................... 16
Figure 5. Basic Test Circuit ...................................... 17
Figure 6. Metallic PSRR ........................................... 17
Figure 7. Longitudinal PSRR.................................... 17
Figure 8. Longitudinal Balance................................. 18
Figure 9. RFI Rejection............................................. 18
Figure 10. Longitudinal Impedance .......................... 18
Figure 11. ac Gains.................................................. 18
Figure 12. L8560 Receive Gain and Hybrid
Balance vs. Frequency .......................... 19
Figure 13. L8560 Transmit Gain and Return Loss
vs. Frequency ........................................ 19
Figure 14. L8560 Typical V
CC
Power Supply
Rejection................................................ 19
Figure 15. L8560 Typical V
BAT
Power Supply
Rejection................................................ 19
Figure 16. Loop Closure Program Resistor
Selection................................................ 20
Figure 17. Ring Ground Detection Programming ..... 20
Figure 18. Loop Current vs. Loop Voltage................ 20
Figure 19. Loop Current vs. Loop Resistance.......... 20
Figure 20. L8560 Typical SLIC Power Dissipation
vs. Loop Resistance............................... 21
Figure 21. Power Derating........................................ 21
Figure 22. Loop Current vs. Loop Voltage................ 21
Figure 23. SLIC 2-Wire Output Stage....................... 23
Figure 24. Equivalent Circuit for Adjusting the
Overhead Voltage.................................. 23
Figure 25. Equivalent Circuit for Adjusting the
dc Feed Resistance ............................... 23
Figure 26. Adjusting Both Overhead Voltage and
dc Feed Resistance ............................... 24
Figure 27. Off-Hook Detection Circuit....................... 24
Figure 28. POTS Controlled from an ISDN
Terminal Adapter ................................... 28
Figure 29. Ringing Waveform Crest Factor = 1.6..... 28
Figure 30. Ringing Waveform Crest Factor = 1.2..... 28
Figure 31. Equivalent Ring Trip Circuit for
Balanced Ringing SLIC ......................... 29
Figure 32. Thevenin Equivalent Ring Trip Circuit
for Balanced Ringing SLIC..................... 29
Figure 33. POTS Interface with Balanced Ringing
Using L8560 SLIC and T8503 Codec .... 31
Figure 34. Ring Trip Equivalent Circuit and
Equivalent Application ........................... 33
Figure 35. Basic Loop Start Application Circuit
Using T7504 Codec and Bused
Ringing................................................... 34
Figure 36. Ground Start Application Circuit.............. 35
Figure 37. ac Equivalent Circuit Not Including
Spare Op Amp ....................................... 38
Figure 38. ac Equivalent Circuit Including Spare
Op Amp.................................................. 38
Figure 39. Interface Circuit Using First-Generation
Codec (Blocking Capacitors Not
Shown)................................................... 41
Figure 40. ac Interface Using First-Generation
Codec (Including Blocking Capacitors)
for Complex Termination Impedance..... 43
Tables
Page
Table 1. L8560 Product Family Feature Summary..... 4
Table 2. Pin Descriptions............................................ 7
Table 3. Input State Coding........................................ 9
Table 4. Supervision Coding ...................................... 9
Table 5. Power Supply ............................................. 12
Table 6. 2-Wire Port ................................................. 13
Table 7. Analog Pin Characteristics ......................... 14
Table 8. Uncommitted Op Amp
Characteristics (44-Pin PLCC Only).......... 14
Table 9. ac Feed Characteristics.............................. 15
Table 10. Logic Inputs and Outputs.......................... 16
Table 11. Parts List for Balanced Ringing Using
T8503 Codec.......................................... 32
Table 12. Parts List for Loop Start with Bused
Ringing and Ground Start Applications .. 35
Table 13. 600
Design Parameters........................ 37