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(yè)數(shù)： 46/64頁(yè)
文件大?。?/td> 1052K
代理商： PBL38773/1ML
Ringing FlexiSLIC
PBL 38773/1
Maximum Loop Length
Data Sheet
50
DS1, 2003-06-18
8
Maximum Loop Length
The maximum loop length depends on three critical factors:
Ringing voltage, waveform and number of RENs, Chapter 8.1
Ring-trip current and number of RENs, Chapter 8.2
The voltage of
V
TBAT sets the Off-Hook Loop length, Chapter 6.4
8.1
Ringing Voltage, Waveform and Number of RENs
The SLIC is using the AGC-R feature. It is capable of producing high voltage over a large
number of RENs together with minimum distortion when ringing at low number of RENs.
Using a waveform with a lower crest factor,reducing the number of RENs or increasing
the
V
TBAT voltage will expand the loop length. The maximum loop length can be
calculated using.
[25]
with DC-offset:
[26]
where:
Example:
V
BAT = -80 V, ZBell = 5 REN = 1400 (1386 + 40F), αmin = 0%, RF = 40 , VRDCT-R = 0,
CF = 1.41, V
Bell = 40 VRMS, This will give: RL = 378 .
40
Is the resistance of the SLICs internal resistors connected in series with
output amplifiers (see Figure 13).
V
Bell
Is the voltage, in VRMS, over the phone.
V
BAT
Is the voltage at the VBAT pin.
α
min
Is the variation of the battery. -2% will give an
α = 0.98.
Z
Bell
Is the resistance of the bell in on-hook. Typical 1400
for 5 REN.
R
F
Is the resistance of one fuse resistor.
CF
Is the crestfactor. Use 1.41 for sinusoidal, 1.2 for trapezoidal and use 1
for squarewave.
VR
DCT-R
Is the DC voltage difference between the Tip and Ring wire.
R
L
V
BAT
α
min
×
3.5
–
() Z
Bell
×
V
Bell
CF
×
-------------------------------------------------------------------------
Z
Bell
40
2
R
F
++
()
–
=
R
L
V
BAT
α
min
×
3.5
–
VR
DCT R
–
() Z
Bell
×
V
Bell
CF
×
-------------------------------------------------------------------------------------------------------
Z
Bell
40
2
R
F
++
()
–
=
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