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LUCL9216BGF-DT 参数 Datasheet PDF下载

LUCL9216BGF-DT图片预览
型号: LUCL9216BGF-DT
PDF下载: 下载PDF文件 查看货源
内容描述: [SLIC, PQCC28, PLASTIC, LCC-28]
分类和应用: 电信电信集成电路
文件页数/大小: 44 页 / 950 K
品牌: ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
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L9216B/H  
Preliminary Data Sheet  
September 2001  
High-Voltage Ringing SLIC with Ground Start  
Supervision (continued)  
80  
60  
Tip or Ring Ground Detector  
40  
In the ground key or ground start applications, a com-  
mon-mode current detector is used to indicate either a  
tip- or ring-ground has occurred (ground key) or an off-  
hook has occurred (ground start).  
20  
0
–20  
–40  
–60  
–80  
For ground start applications, detection may be seen at  
the output of the common-mode current detector  
(RGDET) or the loop closure detector (NSTAT).  
0.00 0.04 0.08 0.12 0.16 0.20  
0.02 0.06 0.10 0.14 0.18  
TIME (s)  
If ICM is used, the detection threshold is set by con-  
necting a resistor from ICM to VCC.  
12-3346a (F)  
Note: Slew rate = 5.65 V/ms; trise = tfall = 23 ms; pwidth = 2 ms;  
period = 50 ms.  
205 x VCC/RICM (k) = ITH (mA)  
Additionally, a filter capacitor across RICM will set the  
time constant of the detector. No hysteresis is associ-  
ated with this detector. The RC filter at ICM gives  
immunity to longitudinal currents.  
Figure 8. Ringing Waveform Crest Factor = 1.6  
80  
60  
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); therefore, maintain  
the detector at 10 mA. Thus, NSTAT may also be used  
for loop closure detion in ground start. However, the  
detector at NSTAT is not filtered against longitudinal  
currents, which may or may not be an issue in short-  
loop applications. Using NSTAT will also save compo-  
nents at ICM.  
40  
20  
0
–20  
–40  
–60  
–80  
0.00 0.04 0.08 0.12 0.16 0.20  
0.02 0.06 0.10 0.14 0.18  
TIME (s)  
12-3347a (F)  
Note: Slew rate = 10.83 V/ms; trise = tfall = 12 ms; pwidth = 13 ms;  
period = 50 ms.  
Power Ring  
Figure 9. Ringing Waveform Crest Factor = 1.2  
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 RINGIN 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.  
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.  
Various crest factors are shown for illustrative pur-  
poses.  
24  
Agere Systems Inc.  
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