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零件编号 | UBA1706 | ||
描述 | Cordless telephone line interface | ||
制造商 | NXP Semiconductors | ||
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1 Page
INTEGRATED CIRCUITS
DATA SHEET
UBA1706
Cordless telephone line interface
Objective specification
Supersedes data of 1999 Mar 08
File under Integrated Circuits, IC17
1999 Jun 04
Philips Semiconductors
Cordless telephone line interface
Objective specification
UBA1706
The DC line current flowing into the set is determined by
the exchange supply voltage (Vexch), the feeding bridge
resistance (Rexch), the DC resistors of the telephone line
(Rline) and the set (RSET), the reference voltage (Vref) and
the voltage introduced by the transistor (TNSW) used as
line interrupter (see Fig.5).
With a line current below Ilow (8 mA with ZSET = 619 Ω), the
internal reference voltage (Vref) is automatically adjusted
to a lower value. This means that several sets can operate
in parallel with DC line voltages (excluding the polarity
guard) down to 1.2 V. With a line current below Ilow, the
circuit has limited transmit and receive levels. This is called
the low voltage area.
Figure 6 shows in more detail how the UBA1706, in
association with some external components, manages the
line interrupter (TNSW external transistor).
In on-hook conditions (voltage at pin EHI is LOW), the
voltage at pin LCC is pulled up to the supply voltage level
(VCC) to turn off transistor TPDARL. As a result, because of
resistor RPD, transistors TNSW and TNON-HOOK are
switched off. Transistor TNON-HOOK disconnects resistor
RLVI from the LN− line terminal to guarantee a high
on-hook impedance.
In off-hook conditions (voltage at pin EHI is HIGH), an
operational amplifier drives (at pin LCC) the base of
transistor TPDARL, which forms a current amplifier
structure in association with TNSW. The line current flows
through transistor TNSW. Transistor TNON-HOOK is forced
into deep saturation. A virtual ground is created at pin LVI
because of the operational amplifier. A DC current (ILVI) is
sourced from pin LVI into the RLVI resistor to generate a
voltage source. Thus, the voltage across pins GND and
LN− becomes:
VCE (TNSW) = RLVI × ILVI + VCE (TNON-HOOK) ≅ RLVI × ILVI
The voltage Vline across line terminals LN+ and LN− can
be calculated as follows:
Vline ≅ Vref + RSLPE × (Iline − IZSET) + VCE (TNSW)
Where:
Iline = line current
IZSET = current flowing through ZSET.
1999 Jun 04
8
Philips Semiconductors
Cordless telephone line interface
Objective specification
UBA1706
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
VCC
VLN
VSWIn
Vn(max)
ILN
ISWIn
Ptot
Tstg
Tamb
Tj
PARAMETER
supply voltage
positive continuous line voltage on pin LN
repetitive line voltage during switch-on or
line interruption
voltage on pins SWI1 and SWI2
maximum voltage on all other pins
current sunk by pin LN
continuous current sunk by pins SWI1 and
SWI2
total power dissipation
IC storage temperature
ambient temperature
junction temperature
CONDITIONS
MIN.
GND − 0.4
GND − 0.4
GND − 0.4
continuous
during switching
see Fig.12
bit SWCn = 1
GND − 0.4
GND − 0.4
GND − 0.4
−
−
Tamb = 75 °C; see Fig.12 −
−40
−25
−
MAX.
5.5
12.0
13.2
12.0
13.2
VCC + 0.4
150
20
454
+125
+75
+125
UNIT
V
V
V
V
V
V
mA
mA
mW
°C
°C
°C
THERMAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
Rth(j-a)
thermal resistance from junction to ambient in free air
VALUE
100
UNIT
K/W
1999 Jun 04
16
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页数 | 28 页 | ||
下载 | [ UBA1706.PDF 数据手册 ] |
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