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TEA1064B Fiches technique(PDF) 6 Page - NXP Semiconductors

No de pièce TEA1064B
Description  Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1064B Fiches technique(HTML) 6 Page - NXP Semiconductors

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March 1994
6
Philips Semiconductors
Product specification
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
TEA1064B
FUNCTIONAL DESCRIPTION
Supplies VCC, VEE2, LN, SLPE, REG and STAB (Figs 3
and 5)
Power for the TEA1064B and its peripheral circuits is
usually obtained from the telephone line. The IC develops
its own supply voltage at VCC and regulates its voltage
drop. The internal supply requires a decoupling capacitor
between VCC and VEE1. The internal current stabilizer is
set by a 3.6 k
Ω resistor between STAB and VEE1.
The DC current flowing into the set is determined by the
exchange supply voltage Vexch, the feeding bridge
resistance Rexch, the subscriber line DC resistance Rline
and the DC voltage (including polarity guard) on the
subscriber set (see Fig.3).
The internal voltage regulator generates a
temperature-compensated reference voltage that is
available between LN and SLPE (Vref = VLN-SLPE = 3.23 V
typ.). This internal voltage regulator requires decoupling
by a capacitor between REG and VEE1 (C3).
The configuration shown in Fig.3, gives a stabilized
voltage across pins LN and SLPE which, applied via the
low-pass filter R16, C15, provides a supply to the
peripherals that is independant of the line current and
depends only on the peripheral supply current.
The value of R16 and the level of the DC voltage VLN-SLPE
determine the supply capabilities. In the basic application
R16 = 392
Ω and C15 = 220 µF. The worst-case
peripheral supply current as a function of supply voltage is
shown in Fig.4.
To increase the supply capabilities, the value of R16 can
be decreased or the DC voltage VLN-SLPE can be increased
by using RVA(REG-SLPE).
Note
The TEA1064B application is the same as is used for
TEA1060/TEA1061, TEA1067 and TEA1068 integrated
circuits.
Fig.3 Supply arrangement with reference to SLPE.
The voltage VLN-SLPE is fixed to Vref = 3.323 ±0.25 V.
Resistor R16 together with the line current determine the supply capabilities and the maximum output swing on
the line (no loop damping is necessary).
The line voltage VLN =Vref + ({Iline − 1.55 mA} × R9).
handbook, full pagewidth
MBA435
Rexch
Rline
Iline
Vexch
DC
AC
17
REG
C3
R5
R9
10
STAB
20
SLPE
LN
1
VCC
16
11
VEE1
19
VEE2
0.25 mA
R1
ISLPE + 0.25 mA
ICC
R16
C1
C15
peripheral
circuits
Vp
Ip
TEA1064B
Ip + 0.25 mA


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