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Agere Systems

L8560 Datasheet Preview

L8560 Datasheet

Low-Power SLIC

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Data Sheet
April 2000
L8560 Low-Power SLIC with Ringing
Features
Description
s Full-feature set for central office applications
s Also ideal for ISDN terminal adapters, pair gain,
and cable telephony applications
s Auxiliary input for second battery, and internal
switch to enable its use to save power in short tele-
phone loops
s 5 V only operation or optional ±5 V operation for
reduced power consumption
s Low active power (85 mW typical) and scan power
(61 mW typical) with 5 V only operation
s Low active power (68 mW typical with auxiliary bat-
tery) and scan power (45 mW typical) with ±5 V
operation
s Quiet tip/ring polarity reversal
s Per-line ringing available for short loops
s Reduced overhead and increased current limit dur-
ing ring mode for lower-battery operation or
increased ring loop length
s Supports meter pulse injection
s Distortion-free full duplex from 0 mA dc loop cur-
rent on-hook transmission
s Convenient operating states:
— Forward powerup
— Polarity reversal powerup
— Forward sleep
— Ground start
— Disconnect
s Adjustable supervision functions:
— Off-hook detector with longitudinal rejection
— Ground key detector with longitudinal rejection
— Ring trip detector
s Independent, adjustable dc and ac parameters:
— dc feed resistance (44-pin PLCC version)
— Loop current limit
— Termination impedance
s Thermal protection
The L8560 full-feature, low-power subscriber line
interface circuit (SLIC) is optimized for low power
consumption while providing an extensive set of fea-
tures. This part is ideal for ISDN terminal adapter
applications and short-loop, power-sensitive applica-
tions such as pair gain and cable telephony. This part
is also designed for PBX, DLC, or CO applications.
The SLIC includes an auxiliary battery input and a
battery switch. In short-loop applications, SLICs can
be used in high battery to present a high on-hook
voltage, and then switched to low battery to reduce
off-hook power.
To help minimize the required auxiliary battery volt-
age, the dc feed resistance and overhead voltage are
set at 55 and 6.7 V, respectively. This allows an
undistorted on-hook transmission of a 3.14 dBm sig-
nal into a 900 loop impedance.
The device offers the reverse battery function. Using
the reverse battery, the device can provide a bal-
anced power ring signal to tip and ring. In this
mode of operation, the battery switch is used to
apply a high-voltage battery during ringing and a
lower-voltage battery during the talk and idle states.
Also included in the L8560 is a dc current-limit
switch, which increases the dc current limit during
power ringing. In addition, dc overhead voltage is
reduced during the ring state. With the battery and
current-limit switches, and overhead reduction, the
L8560 can provide sufficient power to ring a true
North American 5 REN load of 1386 + 40 µF.
The device offers ring trip and loop closure supervi-
sion with 0.3 V and 2 mA hysteresis, respectively. It
also includes the ground start state and ring ground
detection. A summing node for meter pulse injection
to 2.2 Vrms is also included. The 44-pin PLCC ver-
sion also has a spare uncommitted op amp, which
may be used for ac gain setting or meter pulse filter-
ing.




Agere Systems

L8560 Datasheet Preview

L8560 Datasheet

Low-Power SLIC

No Preview Available !

L8560 Low-Power SLIC with Ringing
Data Sheet
April 2000
Table of Contents
Contents
Page Contents
Page
Features .................................................................... 1
Description ................................................................. 1
Pin Information ........................................................... 6
Functional Description ................................................ 9
Absolute Maximum Ratings ..................................... 10
Recommended Operating Conditions ...................... 11
Electrical Characteristics .......................................... 11
Ring Trip Requirements ......................................... 16
Test Configurations .................................................. 17
Applications ............................................................. 19
Characteristic Curves............................................. 19
dc Applications ...................................................... 21
Battery Feed...................................................... 21
Overhead Voltage ............................................ 22
Adjusting Overhead Voltage ............................. 23
Adjusting dc Feed Resistance........................... 23
Adjusting Overhead Voltage and dc Feed
Resistance Simultaneously.............................. 24
Loop Range....................................................... 24
Off-Hook Detection ........................................... 24
Ring Ground Detection...................................... 25
Longitudinal Balance.............................................. 25
Power Derating ..................................................... 25
Battery Switch ....................................................... 26
VCC/VEE Supplies ................................................... 27
Power Ringing ....................................................... 27
Ringing SLIC Balanced Ring Signal
Generation ....................................................... 27
POTS for ISDN Terminal Adapters ................... 27
Power Ringing Load .......................................... 28
Crest Factor....................................................... 28
Current-Limit Switch .......................................... 29
Ring Trip............................................................ 29
Reference Designs for ISDN TA Applications ... 31
Design Considerations .......................................... 33
Unbalanced Bused Ring Signal Application ...... 33
Ring Trip Detection............................................ 33
ac Design .............................................................. 37
First-Generation Codecs ................................... 37
Second-Generation Codecs .............................. 37
Third-Generation Codecs .................................. 37
Design Examples ................................................... 39
Example 1, Real Termination ............................ 39
Example 2, Complex Termination ..................... 39
Example 3, Complex Termination Without
Spare Op Amp ................................................. 39
Complex Termination Impedance Design
Example Using L8560 Without Spare
Op Amp ............................................................ 40
ac Interface Using First-Generation Codec ....... 40
Transmit Gain.................................................... 41
Receive Gain..................................................... 42
Hybrid Balance .................................................. 42
Blocking Capacitors........................................... 43
Outline Diagrams...................................................... 44
32-Pin PLCC ......................................................... 44
44-Pin PLCC ......................................................... 45
Ordering Information................................................. 46
2 Lucent Technologies Inc.


Part Number L8560
Description Low-Power SLIC
Maker Agere Systems
Total Page 30 Pages
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