參數(shù)資料
型號(hào)： LUCL8560DAU-D
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(yè)數(shù)： 22/46頁(yè)
文件大小： 842K
代理商： LUCL8560DAU-D
22
Lucent Technologies Inc.
Data Sheet
April 2000
L8560 Low-Power SLIC with Ringing
Applications
(continued)
dc Applications
(continued)
Starting from the on-hook condition and going through
to a short circuit, the curve passes through two regions:
Region 1: On-hook and low loop currents. In this region,
the slope corresponds to the dc resistance of the SLIC,
R
dc1
(default is 55
typical). The open circuit voltage
is the battery voltage less the overhead voltage of the
device, V
OH
(default is 6.7 V typical). These values are
suitable for most applications but can be adjusted if
needed. For more information, see the sections titled
Adjusting dc Feed Resistance or Adjusting Overhead
Voltage.
Region 2: Current limit. The dc current is limited to a
starting value determined by external resistor R
PROG
, an
internal current source, and the gain from tip/ring to pin
DCOUT. Current limit is set by the equation:
I
PROG
x R
PROG
= I
LIM
x B
DCOUT
Where:
I
PROG
= the current from an internal current source
R
PROG
= the external resistor used to set the current
limit
B
DCOUT
= the transconductance from tip/ring to
DCOUT, which is nominally 41.67 V/A
During nonringing modes, the internal current source is
set at 75
μ
A, thus:
I
PROG
x R
PROG
= I
LIM
x B
DCOUT
R
PROG
= I
LIM
x B
DCOUT
/I
PROG
R
PROG
(K) = I
LIM
(mA) x 0.04167 (V/mA)/75e
–3 (mA)
R
PROG
(K) = 0.556 x I
LIM
(mA)
Testing data shows that:
R
PROG
(K) = 0.616 x I
LIM
(mA)
This equation is a first-order estimation of the loop cur-
rent at current-limit range.
For more precise loop current at current-limit range, the
loop current is also determined by loop length, protec-
tion resistance, and battery voltage. It can be shown
through calculations as follows:
Current-limit onset (I
Lonset
):
I
Lonset
(mA) =
Loop resistance where current-limit onsets (R
Lonset
):
R
Lonset
(
) =
x 1000 – 2R
P
– Rdc
Tip/ring voltage where current-limit onsets (V
T/Ronset
):
V
T/Ronset
=
Tip/ring voltage when loop resistance is R
loop
(V
T/Rloop
):
V
T/Rloop
(V) = I
loop
(mA) x R
LOOP
(
)/1000
Loop current is now given by:
I
loop
(mA) = I
Lonset
(mA) + (V
T/Ronset
– V
T/Rloop
)
(V)/12.5 (k
)
or
I
loop
(mA) =
Current limit is not sensitive to temperature variation.
Overhead Voltage
In order to drive an on-hook ac signal, the SLIC must set
up the tip and ring voltage to a value less than the bat-
tery voltage. The amount that the open loop voltage is
decreased relative to the battery is referred to as the
overhead voltage and is expressed as:
V
OH
=
|
V
BAT
|
– (V
PT
– V
PR
)
Without this buffer voltage, amplifier saturation will
occur and the signal will be clipped. The L8560 is auto-
matically set at the factory to allow undistorted on-hook
transmission of a 3.17 dBm signal into a 900
loop
impedance.
The drive amplifiers are capable of 4 Vrms minimum
(V
AMP
). So, the maximum signal the device can guaran-
tee is:
V
T/R
= 4 V
For applications where higher signal levels are needed,
e.g., periodic pulse metering, the 2-wire port of the
SLIC can be programmed with pin DCR (pin DCR is
not available in the 32-pin PLCC package). The first
step is to determine the amount of overhead voltage
needed. The peak voltage at output of tip and ring
amplifiers is related to the peak signal voltage by:
0.616
K
---------------------------------
I
Lonset
mA
(
-------------------------------------------------
)
R
Lonset
2R
P
+
-------------------------------------------------------------------
Rdc
+
-----------------------------------------------------------------------------------------------------------
R
loop
(
)
)
1
)
12500 k
+
+
Z
T/R
2R
P
---------------------------------
V
AMP
= V
T/R
1
Z
T/R
-----------
+
Λ
Λ
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