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參數資料
| 型號： | UBA1707 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Cordless telephone, answering machine line interface(無繩電話，電話應答機線接口) |
| 中文描述： | 無繩電話，應答機行界面（無繩電話，電話應答機線接口） |
| 文件頁數： | 10/36頁 |
| 文件大小： | 245K |
| 代理商： | UBA1707 |
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1999 Feb 17
10
Philips Semiconductors
Product specification
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 V
CE
(TN
SW
) 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),
V
CE
(TN
SW
) voltage is fixed by means of a 200 nA DC
constant current I
LVIV
flowing through R
LVI
.
Fig.7
General form of the DC mask as a function
of regulation mode.
(1) Low voltage area.
(2) Small slope (determined by R
SLPE
).
(3) Small slope (dashed line; determined by R
SLPE
) in voltage
regulation mode.
High slope (full line; determined by R
SLPE
, R
LVI
and R
RGL
) in
current regulation mode.
(4) Current limitation.
handbook, halfpage
MGK710
Iline
Iprot
(4)
Iknee
Ilow
(1)
(2)
(3)
Therefore V
CE
(TN
SW
)
R
LVI
×
I
LVIV
= 200 mV in typical
application (see Fig.18).
The slope
V
line
/
I
line
of the V
line
, I
line
characteristic is
R
REGV
R
SLPE.
Current regulation mode
In current regulation mode (bit CRC at logic 1), when the
line current is lower than I
knee
= 35 mA (with
Z
SET
= 619
), V
CE
(TN
SW
) is fixed by means of a 200 nA
DC constant current I
LVIV
flowing through R
LVI
. When the
line current is higher than 35 mA, an additional current
(proportional to the line current) flows through R
LVI
. As a
result, TN
SW
works as a DC voltage source increasing with
the line current. V
CE
(TN
SW
) can be calculated as follows:
R
RGL
Where:
I
line
= line current
R
RGL
= resistor connected at pin RGL.
The slope
V
line
/
I
line
of the V
line
, I
line
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.
E
LECTRONIC HOOK SWITCH CONTROL
(
PIN
EHI)
The electronic hook switch input (EHI) controls the state of
TP
DARL
transistor. When the voltage applied at pin EHI is
LOW, TP
DARL
transistor is turned off. Voltage at pin LCC is
pulled up to supply voltage (V
CC
). TN
SW
and TN
ON-HOOK
transistors are also turned off by means of a pull-down
resistor (R
PLD
). When the voltage applied at pin EHI is
HIGH, TP
DARL
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 V
CC
.
V
CE
TN
SW
(
)
R
LVI
-R
I
line
I
knee
–
(
)
I
LVIV
+
×
×
R
REGC
R
SLPE
R
LVI
R
R
RGL
---------------
1400
=
×
+
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