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Agere Systems

L8576B Datasheet Preview

L8576B Datasheet

Dual Ringing SLIC

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Data Sheet
May 2001
L8576B Dual Ringing SLIC
Features
s Two SLIC channels for multiple tip/ring interfaces
s On-chip balanced ringing generator, no ring relay
required
s Single battery operation or optional automatic bat-
tery switch
s Quiet battery reversal for on-hook signaling
s Disconnect state
s Distortion-free, on-hook transmission
s 24 mA loop current limiter
s Ring trip detector
s Switchhook detector
s Immune to channel crosstalk and impulse noise
s Allows rail overvoltages for ease of protection
s Thermal protection
s 44-pin, surface-mount, plastic package (PLCC)
Applications
s POTS for ISDN
s Terminal adapters (TA)
s Digital loop carrier (DLC) systems
s PABX
Description
The Agere Systems Inc. L8576B electronic dual sub-
scriber line interface circuit (SLIC) provides all the
functions that are necessary to interface a codec to
the tip and ring of a subscriber loop, integrating two
battery feeds and ringing generators in one low-cost
package. The L8576B device is optimized to meet
the needs of short loop, customer premises applica-
tions and features balanced ringing from the single
battery supply. The device is built using a 90 V com-
plementary bipolar (CBIC) process. It is available in a
44-pin PLCC package.




Agere Systems

L8576B Datasheet Preview

L8576B Datasheet

Dual Ringing SLIC

No Preview Available !

L8576B Dual Ringing SLIC
Data Sheet
May 2001
Table of Contents
Contents
Page Figures
Page
Features ......................................................................1
Applications .................................................................1
Description...................................................................1
Pin Information ............................................................5
Functional Description .................................................7
General .....................................................................7
Protection ..................................................................7
Tip/Ring Drivers ........................................................7
Battery Operation......................................................7
Transmit and Receive Interface ................................7
Data Interface ...........................................................8
Loop Current Detector ..............................................8
Operating States..........................................................8
Absolute Maximum Ratings ........................................9
Electrical Characteristics ...........................................10
Test Configurations .................................................. 14
Applications ..............................................................15
Characteristic Curves..............................................15
dc Design ................................................................17
Power Ringing.........................................................18
ac Design ................................................................19
Use of an Auxiliary Battery Supply..........................24
Outline Diagram ........................................................25
44-Pin PLCC ...........................................................25
Ordering Information .................................................26
Tables
Page
Table 1. Pin Descriptions ............................................5
Table 2. Input State Coding ........................................9
Table 3. Operating Conditions and Powering ...........10
Table 4. Ring Trip Detector ......................................10
Table 5. Battery Feed ...............................................11
Table 6. Analog Signal Pins .....................................12
Table 7. ac Feed Characteristics ..............................12
Table 8. Isolation Between Channels .......................13
Table 9. Data Interface and Logic ............................13
Figure 1. Architectural Diagram ................................. 3
Figure 2. Typical 600 Application Circuit (Only
One Channel Shown) ................................. 4
Figure 3. 44-Pin PLCC Pin Diagram .......................... 5
Figure 4. Pretrip Circuit ............................................ 11
Figure 5. Basic Test Circuit ..................................... 14
Figure 6. Metallic PSRR .......................................... 14
Figure 7. Longitudinal PSRR ................................... 14
Figure 8. Longitudinal Balance ................................ 15
Figure 9. Longitudinal Impedance ........................... 15
Figure 10. ac Gains ................................................. 15
Figure 11. Receive Gain and Hybrid Balance vs.
Frequency .............................................. 15
Figure 12. Transmit Gain and Return Loss vs.
Frequency .............................................. 15
Figure 13. Loop Current vs. Loop Voltage ............... 16
Figure 14. Loop Current vs. Loop Resistance ......... 16
Figure 15. SLIC Power Dissipation vs. Loop
Resistance (VBAT = –48 V) ...................... 16
Figure 16. SLIC Power Dissipation vs. Loop
Resistance (VBAT = –65 V) ...................... 16
Figure 17. Loop Current vs. Loop Voltage ............... 17
Figure 18. Ringing Waveform Crest Factor = 1.6 .... 18
Figure 19. Ringing Waveform Crest Factor = 1.2 .... 18
Figure 20. ac Equivalent Circuit Using a T8503
Codec ..................................................... 20
Figure 21. ac Interface Circuit Using First-
Generation Codec (Blocking Capacitors
Not Shown) ............................................. 22
Figure 22. ac Interface Circuit Using First-
Generation Codec (Including Blocking
Capacitors) ............................................. 23
2 Agere Systems Inc.


Part Number L8576B
Description Dual Ringing SLIC
Maker Agere Systems
Total Page 26 Pages
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