參數(shù)資料
型號(hào)： L9215G
廠(chǎng)商： Lineage Power
英文描述： Short-Loop Sine Wave Ringing SLIC(短環(huán)路正弦波振鈴用戶(hù)接口（SLIC）)
中文描述： 短回路正弦波振鈴用戶(hù)接口（短環(huán)路正弦波振鈴用戶(hù)接口電路（SLIC））
文件頁(yè)數(shù)： 24/46頁(yè)
文件大小： 1165K
代理商： L9215G
Advance Data Sheet
October 2000
Short-Loop Sine Wave Ringing SLIC
L9215A/G
24
Lucent Technologies Inc.
Applications
(continued)
dc Loop Current Limit
(continued)
Note that the overall current-limit accuracy achieved
will not only be affected by the specified accuracy of
the internal SLIC current-limit circuit (accuracy associ-
ated with the “67” term), but also by the accuracy of the
voltage source and the accuracy of any external resis-
tor divider network used and voltage offsets due to the
specified input bias current. Tolerance of the current
limit is ±8%. If a resistor divider from V
REF
is used, it is
recommended that the sum of the two resistors be
greater than 100 k
.
The above equations describe the active mode steady-
state current-limit response. There will be a transient
response of the current-limit circuit upon an on- to off-
hook transition. Typical active mode transient current-
limit response is given in Table 14.
Table 14. Typical Active Mode On- to Off-Hook Tip/
Ring Current-Limit Transient Response
Overhead Voltage
Active Mode
Overhead is programmable in the active mode via an
applied voltage source at the device’s OVH control
input. The voltage source may be an external voltage
source or derived via a resistor divider network from
the V
REF
SLIC output or an external voltage source. A
programmable external voltage source may be used to
provide software control of the overhead voltage. The
overhead voltage (V
OH
) is related to the OVH voltage
by:
V
OH
= 6.0 V + 5 * V
OVH
(V)
Overall accuracy is determined by the accuracy of the
voltage source and the accuracy of any external resis-
tor divider network used and voltage offsets due to the
specified input bias current. If a resistor divider from
V
REF
is used, a lower magnitude resistor will give a
more accurate result due to a lower offset associated
with the input bias current; however, lower value resis-
tors will also draw more power from V
REF
.
Note the overhead is not symmetrical with respect to
tip and ring. Under default conditions, the tip to ground
voltage is 2.1 V to 2.6 V and the ring to battery voltage
is 2.8 V to 3.4 V. Additionally, there is a diode drop
associated with the internal clamping circuitry. When
the overhead is increased from the default value via
applied voltage at V
OVH
, the overhead is increased
symmetrically with respect to the default values. That
is, if 1 V was applied at V
OVH
, the tip to ground voltage
is increased 2.5 V and the ring to ground voltage is also
increased 2.5 V.
Note that a default overhead voltage of 6.0 V is
achieved by shorting input pin OVH to analog ground.
Internally, the SLIC needs typically 1 V from ground
and 3 V from battery to bias the amplifier circuitry. This
can be thought of as an internal saturation voltage.
Also, there is a 0.9 V drop associated with an internal
clamping diode. Thus, of the 6 V default overhead,
internal bias consumes 4.9 V, and 1.1 V is available for
peak signal swing.
The default overhead provides sufficient headroom for
on-hook transmission of a 0 dBm signal into 600
.
2
0.6
0 = 10 log
Vrms
= 0.775 V and Vpeak = 1.09, which is required
over and above the internal saturation voltage for sig-
nal swing.
Overhead voltage may need to be increased to accom-
modate on-hook transmission of higher-voltage sig-
nals, such as meter pulse. The following example is
meant to illustrate the design procedure that can be fol-
lowed.
Assume we need on-hook transmission of a 1.0 Vrms
meter pulse into 200
. Further, assume 50
protec-
tion resistors are used.
V
OH
= 4.9 V + (1+ [2 * Rp]/200) * Vpeak
V
OH
= 4.9 + (1+ [2 * 50]/200) * 1 (1.414)
V
OH
= 7.021 V.
Parameter
Value
I
LIM
+ 60
Unit
mA
dc Loop Current:
Active Mode
R
LOOP
= 100
On- to Off-hook
Transition t < 5 ms
dc Loop Current:
Active Mode
R
LOOP
= 100
On- to Off-hook
Transition t < 50 ms
dc Loop Current:
Active Mode
R
LOOP
= 100
On- to Off-hook
Transition t < 300 ms
I
LIM
+ 20
mA
I
LIM
mA
-------------------
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