參數(shù)資料
型號： 935263971112
廠商： NXP SEMICONDUCTORS
元件分類： 通信及網(wǎng)絡(luò)
英文描述： SPECIALTY TELECOM CIRCUIT, PDSO28
封裝： PLASTIC, SOT-136, SO-28
文件頁數(shù)： 2/38頁
文件大?。?/td> 287K
代理商： 935263971112
1999 Feb 17
10
Philips Semiconductors
Product specication
Cordless telephone, answering machine
line interface
UBA1707
The UBA1707 offers the possibility to choose two kinds of
regulations for the DC characteristic between the line
terminals LN+ and LN
(see Fig.7):
Voltage regulation mode
Current regulation mode.
The regulation mode is selected by the bit CRC via the
serial interface.
The DC mask regulation is realised by adjusting the DC
voltage VCE (TNSW) between pin GND and line terminal
LN
as a function of the line current.
Voltage regulation mode
In voltage regulation mode (bit CRC at logic 0),
VCE (TNSW) voltage is fixed by means of a 200 nA DC
constant current ILVIV flowing through RLVI.
Fig.7
General form of the DC mask as a function
of regulation mode.
(1) Low voltage area.
(2) Small slope (determined by RSLPE).
(3) Small slope (dashed line; determined by RSLPE) in voltage
regulation mode.
High slope (full line; determined by RSLPE, RLVI and RRGL) in
current regulation mode.
(4) Current limitation.
handbook, halfpage
MGK710
Vline
Iline
Iprot
(4)
Iknee
Ilow
(1)
(2)
(3)
Therefore VCE (TNSW) RLVI × ILVIV = 200 mV in typical
application (see Fig.18).
The slope
Vline/Iline of the Vline, Iline characteristic is
RREGV RSLPE.
Current regulation mode
In current regulation mode (bit CRC at logic 1), when the
line current is lower than Iknee = 35 mA (with
ZSET = 619 ), VCE (TNSW) is fixed by means of a 200 nA
DC constant current ILVIV flowing through RLVI. When the
line current is higher than 35 mA, an additional current
(proportional to the line current) flows through RLVI. As a
result, TNSW works as a DC voltage source increasing with
the line current. VCE (TNSW) can be calculated as follows:
Where:
Iline = line current
RRGL = resistor connected at pin RGL.
The slope
Vline/Iline of the Vline, Iline characteristic is
determined by the ratio of resistors connected at
pins SLPE, LVI and RGL, and can be calculated as
follows:
in
typical application (see Fig.18).
Current limitation
Whatever the selected mode is, the line current is limited
to approximately 145 mA. This current is sensed on SLPE,
for this purpose the external zener diode must be
connected between pins LN and SLPE. The speech
function no longer operates in this condition.
ELECTRONIC HOOK SWITCH CONTROL (PIN EHI)
The electronic hook switch input (EHI) controls the state of
TPDARL transistor. When the voltage applied at pin EHI is
LOW, TPDARL transistor is turned off. Voltage at pin LCC is
pulled up to supply voltage (VCC). TNSW and TNON-HOOK
transistors are also turned off by means of a pull-down
resistor (RPLD). When the voltage applied at pin EHI is
HIGH, TPDARL transistor is driven by the operational
amplifier at pin LCC and the regulation mode selected is
operating. An internal 165 k
pull-up resistor is connected
between pins LCC and VCC.
V
CE TNSW
() R
LVI
R
SLPE
R
RGL
----------------
I
line
I
knee
–
() I
LVIV
+
×
×
R
REGC
R
SLPE
R
LVI
R
SLPE
R
RGL
----------------
1400
=
×
+
相關(guān)PDF資料
PDF描述
935263971118 SPECIALTY TELECOM CIRCUIT, PDSO28
08-040831 OUTLINE AUTO - TANGING MEGAPAC
08-040831-C OUTLINE AUTO - TANGING MEGAPAC
08-040921 OUTLINE MINI MEGAPAC STANDARD CHASSIS
08-040921-D OUTLINE MINI MEGAPAC STANDARD CHASSIS
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