參數(shù)資料
型號(hào)： L9215A
英文描述： CAP CER 2200PF 3.15KVDC R3 RAD
中文描述： 短回路正弦波振鈴用戶接口
文件頁(yè)數(shù)： 26/50頁(yè)
文件大?。?/td> 1115K
代理商： L9215A
Data Sheet
September 2001
Short-Loop Sine Wave Ringing SLIC
L9215A/G
26
Agere Systems Inc.
Applications
(continued)
Overhead Voltage
(continued)
Active Mode
(continued)
Adding 0.5 V for tolerance, the overhead needs to be
increased to (8.121 V + 0.5 V) = 8.621 V to allow for an
undistorted on-hook transmission of a 1 Vrms meter
pulse into 200
. This is done by applying voltage to
pin V
OH
.
V
OH
(V) = 6.0 V + 5 * V
OVH
(V)
8.621 V = 6 V + 5 * V
OVH
V
OVH
= 0.5242 V
Thus, a nominal 0.5242 V is applied to pin V
OVH
to
increase the overhead.
Scan Mode
If the magnitude of the primary battery is greater than
51 V, the magnitude of the open loop tip-to-ring open
loop voltage is clamped typically between 44 V and
51 V. If the magnitude of the primary battery is less
than a nominal 51 V, the overhead voltage will track the
magnitude of the battery voltage, i.e., the magnitude of
the open circuit tip-to-ring voltage will be 4 V to 6 V less
than battery. In the scan mode, overhead is unaffected
by V
OVH
.
On-Hook Transmission Mode
If the magnitude of the primary battery is greater than
51 V, the magnitude of the open loop tip-to-ring open
loop voltage is clamped typically between 41 V and
49 V. If the magnitude of the primary battery is less
than a nominal 51 V, the overhead voltage will track the
magnitude of the battery voltage, i.e., the magnitude of
the open circuit tip-to-ring voltage will be 6 V to 8 V less
than battery. In the scan mode, overhead is unaffected
by V
OVH
.
Ring Mode
In the ring mode, to maximize ringing loop length, the
overhead is decreased to the saturation of the tip ring
drive amplifiers, a nominal 4 V. The tip-to-ground volt-
age is 1 V, and the ring to V
BAT1
voltage is 3 V. In the
ring mode, overhead is unaffected by V
OVH
.
During the ring mode, to conserve power the receive
input at RCVN/RCVP is deactivated. During the ring
mode, to conserve power, the ACC amplifier in the
transmit direction at VITR is deactivated. However, if
the AX amplifier at VTX is active during the ring mode,
differential ring current may be sensed at VTX during
the ring mode.
Loop Range
The dc loop range is calculated using:
R
L
=
– 2R
P
– R
DC
V
BAT2
is typically applied under off-hook conditions for
power conservation and SLIC thermal considerations.
The L9215 is intended for short-loop applications and,
therefore, will always be in current limit during off-hook
conditions. However, note that the ringing loop length
rather than the dc loop length, will be the factor to
determine operating loop length.
Battery Reversal Rate
The rate of battery reverse is controlled or ramped by
capacitors FB1 and FB2. A chart showing FB1 and FB2
values versus typical ramp time is given below. Leave
FB1 and FB2 open if it is not desired to ramp the rate of
battery reversal.
Table 20. FB1 and FB2 Values vs. Typical Ramp
Time
C
FB1
and C
FB2
0.01
μ
F
0.1
μ
F
0.22
μ
F
0.47
μ
F
1.0
μ
F
1.22
μ
F
1.3
μ
F
1.4
μ
F
1.6
μ
F
Transition Time
20 ms
220 ms
440 ms
900 ms
1.8 s
2.25 s
2.5 s
2.7 s
3.2 s
BAT2
V
V
OH
–
I
LIMIT
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