參數(shù)資料
型號(hào)： L9216A
英文描述： CAP CER 270PF 3.15KVDC R3 RAD
中文描述： 短環(huán)振鈴用戶接口與地面開始
文件頁(yè)數(shù)： 25/48頁(yè)
文件大?。?/td> 1062K
代理商： L9216A
Preliminary Data Sheet
September 2001
Short-Loop Ringing SLIC with Ground Start
L9216A/G
Agere Systems Inc.
25
Supervision
(continued)
Tip or Ring Ground Detector
(continued)
Also in the ground start mode, the fixed loop current
threshold associated with the NSTAT detector output is
internally adjusted to account for common-mode cur-
rent detection in ground start mode (as opposed to dif-
ferential current in loop start mode) maintain the
detector at 10 mA. Thus, NSTAT may also be used for
loop closure detion in ground start. However, the detec-
tor at NSTAT is not filtered against longitudinal cur-
rents, which may or may not be an issue in short loop
applications. Using NSTAT will also save components
at ICM.
Power Ring
The device offers a ring mode, in which a balanced
power ring signal is provided to the tip/ring pair. During
the ring mode, a user-supplied low-voltage ring signal
is input to the device’s RING
IN
input. This signal is
amplified to produce the balanced power ring signal.
The user may supply a sine wave input, PWM input, or
a square wave to produce sinusoidal or trapezoidal
ringing at tip and ring.
Various crest factors are shown for illustrative pur-
poses.
12-3346a (F)
Note: Slew rate = 5.65 V/ms; trise = tfall = 23 ms; pwidth = 2 ms;
period = 50 ms.
Figure 9. Ringing Waveform Crest Factor = 1.6
12-3347a (F)
Note: Slew rate = 10.83 V/ms; trise = tfall = 12 ms; pwidth = 13 ms;
period = 50 ms.
Figure 10. Ringing Waveform Crest Factor = 1.2
Voltage applied to the load may be increased by using
a filtered square wave input to produce a lower crest
factor trapezoidal power ring signal at tip and ring.
TIME (s)
–80
–60
–40
–20
0
20
40
60
80
0.00
0.02 0.06
0.04 0.08
0.10
0.12
0.14
0.16
0.18
0.20
V
TIME (s)
–80
–60
–40
–20
0
20
40
60
80
0.00
0.02 0.06
0.04 0.08
0.10
0.12
0.14
0.16
0.18
0.20
V
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