參數(shù)資料
型號(hào)： PBL38773/1ML
廠商： INFINEON TECHNOLOGIES AG
元件分類： 模擬傳輸電路
英文描述： TELECOM-SLIC, PQCC32
封裝： PLASTIC, VQFN-32
文件頁數(shù)： 38/64頁
文件大?。?/td> 1052K
代理商： PBL38773/1ML
Ringing FlexiSLIC
PBL 38773/1
Ringing Voltage
Data Sheet
43
DS1, 2003-06-18
detector output DET. When the voltage over the resistor
R
RT exceeds the reference
voltage the detector output changes state.
Figure 13
Ring Loop Schematic
The ring injection will be described in more detail in Figure 14 and Figure 15. Figure 14
shows a ring sequence with an off-hook at time
t
1. The first diagram shows the voltage
applied to the input,
V
R, together with the voltages at TIPX and RINGX pins. The voltage
of the TIP wire follows the voltage of the
V
R pin. The second diagram shows the rectified
current,
I
L/β through the resistor RRT. The dotted line represent the programmed ring-trip
threshold,
I
LTH/β The third diagram shows the voltage on the detector output. Before time
t
1, the phone is on-hook. The ring voltage is applied symmetrically around a fixed
voltage,
V
BAT/2, to the load. As long as the telephone is on-hook the rectified current IL/β
will not exceed
I
LTH/β. The DET output will be high. The control device will make sure that
the voltage over the load is as high as possible without saturating the power amplifiers.
When the telephone goes off-hook, at time
t
1, the impedance of the load will decrease.
The line current will increase and the control device will reduce the line current to a
maximum of approximately 10 mA above the programmed ring-trip threshold,
I
LTH. When
the rectified current,
I
L/β exceeds or equals to ILTH/β the detector output, DET, will
change to a logic low level, i.e. an off-hook. The voltage of the load will be reduced as a
Control
device
Temp.
IL
Ring
Tip
VR
TIP
RING
PRT
V
R
V
TR
R
L
CRING
20
20
DET
PA
C
RING
R
RT
C
RT
I
L
β
I
L
I
L
ringsch
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