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參數(shù)資料
| 型號： | L7597 |
| 廠商： | Lineage Power |
| 英文描述： | Resistive Subscriber Line Interface Circuit (SLIC), Ring Relay, and Protector (SRP) for Short Loop and TA-909 Applications(用于短環(huán)路和TA-909的電阻性用戶線接口、振鈴繼電器和保護(hù)器) |
| 中文描述： | 電阻用戶線接口電路（SLIC），環(huán)繼電器和保護(hù)（SRP）的短環(huán)路和TA - 909應(yīng)用（用于短環(huán)路和電訊- 909的電阻性用戶線接口，振鈴繼電器和保護(hù)器） |
| 文件頁數(shù)： | 26/34頁 |
| 文件大小： | 564K |
| 代理商： | L7597 |
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26
Lucent Technologies Inc.
Advance Data Sheet
March 1997
Relay, and Protector (SRP) for Short Loop and TA-909 Applications
L7597 Resistive Subscriber Line Interface Circuit (SLIC), Ring
Applications
(continued)
Thermal Shutdown
If the silicon temperature rises above a nominal 145
°
C,
the L7597 will enter a thermal shutdown mode where
all switches are off and the SLIC is in a state that is
functionally equivalent to the disconnect state.
Relay Driver
The L7597 offers a single integrated relay driver. The
relay driver output RDO is low (relay operated) when a
low input on B3 is latched into the device. The driver
has sufficient driver capability to provide 70 mA with a
1.0 V drop and 20 mA with a 0.4 V drop. Turn-off and
turn-on times are a maximum of 10
μ
s.
Solid-State Ringing Access
The L7597 offers solid-state ringing access switches
for power ringing access and for the associated line
break function. During the Ringing state, unbalanced
battery-backed power ringing is applied to the Ring
lead through resistors R
10
and R
1
via ringing access
switch, SW3. The Ring drive amplifier of the L7597
SLIC is isolated from the subscriber loop via the inte-
grated line break switch SW2 during the power ringing
state. Since the Tip lead of the L7597 SLIC is tied to
ground via resistor R
2
, no line break function is associ-
ated with the Tip lead. The return ground path for the
power ringing signal is via R
2
.
The line break switch, SW2, is implemented using a
high-voltage MOS transistor. This gives a linear V-I
characteristic, as seen in Figure 3.
The ON resistance
of this switch is a nominal 50
with a maximum 100
.
This switch is current limited to a nominal 35 mA and
has a maximum off-state voltage rating of 320 V. The
ringing access switch, SW3, is implemented using a
pnpn type structure. This gives a linear V-I characteris-
tic with an offset through the origin. The off-state volt-
age rating is 500 V. Surge current (10
μ
s x 1000
μ
s)
through this switch must be limited to less than 2 A.
Steady state current through this switch must be limited
to less than 150 mA.
Battery Switch
In order to minimize off-hook power consumption, the
L7597 offers a battery switch feature. This feature is
implemented using an integrated solid-state switch,
SW1. The battery switch, SW1, has similar characteris-
tics to the line break switch, SW2, including the 35 mA
current limit. When SW1 is closed, the high-voltage
battery is applied and any dc current from the high-volt-
age battery will be limited by the current-limiting action
of SW1. When SW1 is open, the high-voltage battery is
isolated from the loop. The low-voltage battery is
applied through the current-limit circuit. When the cur-
rent-limit circuit is active, the low-voltage battery is
applied to the subscriber loop and dc current will be
limited to 25 mA. When the current-limit circuit is not
active, the low-voltage battery is isolated from the loop.
The state of SW1 is controlled via logic inputs B0—B2.
Switch 1 determines if the high-voltage battery is
applied to the loop. When SW1 is closed, the high-volt-
age battery is applied to the loop and the dc current
from the high-voltage battery will be limited by the cur-
rent-limit action of SW1. When SW1 is open, the high-
voltage battery is isolated from the loop.
The low-voltage battery is applied to the loop when the
current-limit circuitry is active, regardless of the state of
SW1. If the current-limit circuit is not active, then the
low-voltage battery is isolated from the loop.Whenever
the current-limit circuitry is active, current from the low-
voltage battery is limited to 25 mA. The
talk
state is an
example of this mode of operation.
It is possible to have both the high-voltage and low-volt-
age battery applied to the loop. In the high-battery talk
state, the current limiter is active and SW1 is closed.
Thus, dc loop current is drawn from both batteries. The
current from the high battery is limited to the current
limit of SW1, 35 mA nominal, and the current from the
low-voltage battery is limited to 25 mA by the current-
limit circuit. Thus, in this state, overall dc current is lim-
ited to a nominal 60 mA.
In TA-909, or other short loop application, typically the
high-voltage battery is applied during scan and other
on-hook states. This is to maintain compatibility with
any existing standards for customer premises equip-
ment. In TA-909, the minimum loop is 450
. Given this
short loop range, the lower-voltage battery has suffi-
cient capability to ensure that 18 mA is fed to any loop
in this range. Thus, whenever the handset set goes off
hook, in order to conserve power, operation is switched
to the lower-voltage battery.
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