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參數(shù)資料
| 型號： | L9215A |
| 廠商： | Lineage Power |
| 英文描述： | Short-Loop Sine Wave Ringing SLIC(短環(huán)路正弦波振鈴用戶接口（SLIC）) |
| 中文描述： | 短回路正弦波振鈴用戶接口（短環(huán)路正弦波振鈴用戶接口電路（SLIC）） |
| 文件頁數(shù)： | 27/46頁 |
| 文件大?。?/td> | 1165K |
| 代理商： | L9215A |
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Advance Data Sheet
October 2000
Short-Loop Sine Wave Ringing SLIC
L9215A/G
Lucent Technologies Inc.
27
Supervision
(continued)
Power Ring
(continued)
Sine Wave Input Signal and Sine Wave Power Ring
Signal Output
The low voltage sine wave input is applied to the L9215
at pin RING
IN
. This signal should be ac-coupled
through 0.47
μ
F. During the ring mode, the signal at
RING
IN
is amplified and presented to the subscriber
loop. The differential gain from RING
IN
to tip and ring is
a nominal 55.
When the device enters the ring mode, the
tip/ring overhead set at OVH and the scan clamp circuit
is disabled, allowing the voltage magnitude of the
power ring signal to be maximized. Additionally, in the
ring mode, the loop current limit is increased 2.5X the
value set by the V
PROG
voltage.
The magnitude of the power ring voltage will be a func-
tion of the gain of the ring amplifier, the high voltage
battery, and the input signal at RING
IN
. The input range
of the signal at RING
IN
is 0 V to Vcc. As the input volt-
age at RING
IN
is increased, the magnitude of the power
ring voltage at tip and ring will increase linearly, per the
differential gain of 55, until the tip and ring drive amplifi-
ers begin to saturate. Once the tip and ring amplifiers
reach saturation, further increases of the input signal
will cause clipping distortion of the power ring signal at
tip and ring. The ring signal will appear balanced on tip
and ring. That is, the power ring signal is applied to
both tip and ring, with the signal on tip 180
°
out of
phase from the signal on ring.
Figure 10 shows typical operation of the ring mode,
prior to saturation of the tip and ring drive amplifiers. A
–70 V battery is used with a 100
loop and a 1 REN
load. The input signal is 1 V through a 0.47
μ
F capaci-
tor at RING
IN
, (the input circuit is shown in Figure 11).
This produces a voltage swing from –34 V to –60 V on
ring and from –8 V to –34 V on tip, as shown in Figure
10. Thus, the total voltage swing is 52 V (60 V to 8 V)
for a 1 V input, which is approximately the differential
gain of the device. Note that the tip and ring power ring
signals will swing around V
BATTERY
divided by two. In
this case there is a –70 V battery so tip and ring swing
around –34 V.
12-3573F
12-3574F
Figure 10. Ring Mode Typical Operation
It is recommended that the input level at RING
IN
be
adjusted so that the power ring signal at tip and ring is
just at the edge or slightly clipping. This gives maxi-
mum power transfer with minimal distortion of the sine
wave. The tip side will saturate at a nominal 2 V above
ground. The ring side will saturate at a nominal 3 V
above battery. The input circuit for a sine wave along
with waveforms to illustrate the tip and ring saturation
is shown in Figure 11.
0
–60
0.60
0.62
0.64
0.66
0.68
0.70
0.72
0.74
0.76
0.78
TIME
0.80
–20
–40
VRING
VTIP
1.0
–1.0
0.60
0.62
0.64
0.66
0.68
0.70
0.72
0.74
0.76
0.78
TIME
0.80
0.5
0.0
–0.5
VRINGIN
12-3532.C(F)
Figure 11. RING
IN
Operation
GND
V
BAT
PT
+1
TR
27.5x
RING
IN
0.47
μ
F
INPUT
L9215
V
TIP
V
RING
–1
3 V
100 k
2 V
V
BAT
= –70 V
65 V
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