TEA1062AM1 Datasheet PDF - NXP Semiconductors
| Part Number | TEA1062AM1 | |
| Description | Low voltage transmission circuits with dialler interface | |
| Manufacturers | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TEA1062; TEA1062A
Low voltage transmission circuits
with dialler interface
Product specification
Supersedes data of 1996 Dec 04
File under Integrated Circuits, IC03
1997 Sep 03
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Philips Semiconductors
Low voltage transmission circuits with
dialler interface
Product specification
TEA1062; TEA1062A
FUNCTIONAL DESCRIPTION
Supplies VCC, LN, SLPE, REG and STAB
Power for the IC and its peripheral circuits is usually
obtained from the telephone line. The supply voltage is
derived from the line via a dropping resistor and regulated
by the IC. The supply voltage VCC may also be used to
supply external circuits e.g. dialling and control circuits.
Decoupling of the supply voltage is performed by a
capacitor between VCC and VEE. The internal voltage
regulator is decoupled by a capacitor between REG and
VEE.
The DC current flowing into the set is determined by the
exchange supply voltage Vexch, the feeding bridge
resistance Rexch and the DC resistance of the telephone
line Rline.
The circuit has an internal current stabilizer operating at a
level determined by a 3.6 kΩ resistor connected between
STAB and VEE (see Fig.9). When the line current (Iline) is
more than 0.5 mA greater than the sum of the IC supply
current (ICC) and the current drawn by the peripheral
circuitry connected to VCC (Ip) the excess current is
shunted to VEE via LN.
The regulated voltage on the line terminal (VLN) can be
calculated as:
VLN = Vref + ISLPE × R9
VLN = Vref + {(Iline − ICC − 0.5 × 10−3 A) − Ip} × R9
Vref is an internally generated temperature compensated
reference voltage of 3.7 V and R9 is an external resistor
connected between SLPE and VEE.
In normal use the value of R9 would be 20 Ω.
Changing the value of R9 will also affect microphone gain,
DTMF gain, gain control characteristics, sidetone level,
maximum output swing on LN and the DC characteristics
(especially at the lower voltages).
Under normal conditions, when ISLPE >> ICC + 0.5 mA + Ip,
the static behaviour of the circuit is that of a 3.7 V regulator
diode with an internal resistance equal to that of R9. In the
audio frequency range the dynamic impedance is largely
determined by R1. Fig.3 shows the equivalent impedance
of the circuit.
LN
handbook, halfpage
V EE
Leq R p
R1
V ref
REG
VCC
R9
20 Ω
C3
4.7 µF
C1
100 µF
MBA454
Leq = C3 × R9 × Rp.
Rp = 16.2 kΩ.
Fig.3 Equivalent impedance circuit.
At line currents below 9 mA the internal reference voltage
is automatically adjusted to a lower value (typically 1.6 V
at 1 mA). This means that more sets can be operated in
parallel with DC line voltages (excluding the polarity guard)
down to an absolute minimum voltage of 1.6 V. At line
currents below 9 mA the circuit has limited sending and
receiving levels. The internal reference voltage can be
adjusted by means of an external resistor (RVA).
This resistor when connected between LN and REG will
decrease the internal reference voltage and when
connected between REG and SLPE will increase the
internal reference voltage.
Current (Ip) available from VCC for peripheral circuits
depends on the external components used. Fig.10 shows
this current for VCC > 2.2 V. If MUTE is LOW (TEA1062) or
MUTE is HIGH (TEA1062A) when the receiving amplifier
is driven, the available current is further reduced. Current
availability can be increased by connecting the supply IC
(TEA1081) in parallel with R1 as shown in Fig.19 and
Fig.20, or by increasing the DC line voltage by means of
an external resistor (RVA) connected between REG and
SLPE (Fig.18).
1997 Sep 03
5
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| Information | Total 28 Pages | |
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