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參數(shù)資料
| 型號： | LUCL8560FAU-DT |
| 英文描述： | Low-Power SLIC with Ringing |
| 中文描述： | 低功耗振鈴用戶接口 |
| 文件頁數(shù)： | 27/46頁 |
| 文件大?。?/td> | 842K |
| 代理商： | LUCL8560FAU-DT |
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Lucent Technologies Inc.
27
Data Sheet
April 2000
L8560 Low-Power SLIC with Ringing
Applications
(continued)
Battery Switch
(continued)
desired to use a single battery supply or a dc/dc con-
verter with a single programmable voltage output, tie
V
BAT1
to V
BAT2
and connect the battery to this node.
Note that V
BAT1
is forced during the balanced ringing
state.
V
CC
/V
EE
Supplies
The L8560A/D/E/F SLICs are designed to operate
using battery and only a 5 V power supply. In this mode
of operation, power for the tip/ring drive amplifiers, dc
feedback loop, internal amplifiers, logic, ac, and refer-
ence circuits is drawn from the negative battery (and
5 V supply).
While the L8560A/D/E/F type devices offer very low
power dissipation in both the sleep and active states,
further reduction in power dissipation is possible by use
of battery and +5 V and –5 V power supplies. The
L8560C operates using battery, +5 V, and –5 V power
supplies. When the –5 V is used, the internal amplifi-
ers, logic, ac, and reference circuits draw power from
the negative –5 V supply, not the negative battery.
Since the magnitude of the –5 V supply is less than the
battery, power consumption is reduced. With the
L8560C, the tip/ring drive amplifiers and dc feedback
loop still draw power from the battery.
Power Ringing
The L8560 ringing SLIC is designed with the capability
of generating balanced power ring signal to tip and
ring. Because the SLIC itself generates the power ring-
ing signal, no ring relay is needed in this mode of oper-
ation. Alternatively, the L8560 SLIC can also be used in
the more standard battery-backed, unbalanced ringing
application. In this case, the ring signal is generated by
a central ring generator and is bused to individual tip/
ring pairs. A ringing relay is used during ringing to dis-
connect the SLIC from, and apply the ring generator to,
the tip and ring pair.
This section discusses in detail the use of the L8560
ringing SLIC in either mode of application.
Ringing SLIC Balanced Ring Signal Generation
The internal dc current source drives current into or
pulls current out from C
FB1
and C
FB2
depending on
whether the SLIC is operating at battery forward or at
battery reversal. The voltage at PT then will be positive
with respect to PR or vice versa. If a square wave sig-
nal is added to B1, the SLIC will be operating consecu-
tively at battery forward, and then battery reversal. The
differential output at PT and PR can be a balanced
power ringing signal. Its frequency is equal to that of
the square wave at B1. Its slew rate is determined by
the size of the capacitors C
FB1
and C
FB2
.
If a sinusoidally modulated pulse-width-modulation
(PWM) signal is applied to B1, the differential output at
PT and PR will be sinusoidal. Theoretically, it provides
power ringing in a sinusoidal format. For more informa-
tion, please refer to the
L8560 Sinusoidal Ringing Gen-
eration Using a PWM Input to B1
Application Note.
POTS for ISDN Terminal Adapters
The L8560 ringing SLIC is designed to provide a bal-
anced power ring signal to tip and ring. This mode of
operation is suited for short-loop, plain old telephone
service (POTS) applications, such as ISDN terminal
adapters (TA).
When ISDN was first visualized, it was thought that we
would all exchange our existing telephones for new,
full-feature ISDN phones. Digital technology would
drive these sets to very low costs. While this may hap-
pen in the future, the current demand is for the ISDN
TA to service a standard analog telephone. The chal-
lenges of this application are discussed here along with
a suggested solution.
Until recently, POTS has been the exclusive domain of
the service provider. Over its 100-year history, any
architectural change was always required to be com-
patible with the existing installed local loop plant and all
telephone sets.
If this is the expectation of the TA, it would be capable
of being connected into the residence phone wiring to
drive every phone in the house. It would also be
designed with enough backup battery to provide unin-
terrupted service during electrical power interruptions.
In this case, adherence to a standard, such as
Bellcore’s TA-909, is recommended.
For the case where a TA is only going to provide limited
service, the design can be made less costly by limiting
the scope of the device. An example of this limited
scope would be the provision of analog jacks for a FAX/
modem and a phone set near the TA in a home office
environment. A block diagram of a POTS design is out-
lined in Figure 28.
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