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TEA1112 Datasheet(PDF) 5 Page - NXP Semiconductors

Part No. TEA1112
Description  Low voltage versatile telephone transmission circuits with dialler interface
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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TEA1112 Datasheet(HTML) 5 Page - NXP Semiconductors

 
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1997 Mar 26
5
Philips Semiconductors
Product specification
Low voltage versatile telephone
transmission circuits with dialler interface
TEA1112; TEA1112A
FUNCTIONAL DESCRIPTION
All data given in this chapter are typical values, except
when otherwise specified.
Supply (pins LN, SLPE, VCC and REG)
The supply for the TEA1112; TEA1112A and their
peripherals is obtained from the telephone line.
The ICs generate a stabilized reference voltage (Vref)
between pins LN and SLPE. This reference voltage is
equal to 3.35 V, is temperature compensated and can be
adjusted by means of an external resistor (RVA). It can be
increased by connecting the RVA resistor between
pins REG and SLPE (see Fig.5), or decreased by
connecting the RVA resistor between pins REG and LN.
The voltage at pin REG is used by the internal regulator to
generate the stabilized reference voltage and is decoupled
by a capacitor (CREG) which is connected to VEE. This
capacitor, converted into an equivalent inductance (see
Section “Set impedance”), realizes the set impedance
conversion from its DC value (RSLPE) to its AC value (RCC
in the audio-frequency range). The voltage at pin SLPE is
proportional to the line current. Figure 4 illustrates the
supply configuration.
The ICs regulate the line voltage at pin LN, and can be
calculated as follows:
V
LN
V
ref
R
SLPE
I
SLPE
×
+
=
I
SLPE
I
line
I
CC
I
p
I∗
I
LED
I
+
sh
==
Where:
Iline = line current
ICC = current consumption of the IC
Ip = supply current for peripheral circuits
I* = current consumed between LN and VEE
ILED = supply current for the LED component
Ish = the excess line current shunted to SLPE (and VEE)
via LN.
The preferred value for RSLPE is 20 Ω. Changing RSLPE will
affect more than the DC characteristics; it also influences
the microphone and DTMF gains, the LED supply current
characteristic, the gain control characteristics, the
sidetone level and the maximum output swing on the line.
The internal circuitry of the TEA1112; TEA1112A is
supplied from pin VCC. This voltage supply is derived from
the line voltage by means of a resistor (RCC) and must be
decoupled by a capacitor CVCC. It may also be used to
supply peripheral circuits such as dialling or control
circuits. The VCC voltage depends on the current
consumed by the IC and the peripheral circuits as shown
by the formula (see also Figs.6 and 7). RCCint is the
internal impedance of the voltage supply point, and Irec is
the current consumed by the output stage of the earpiece
amplifier.
V
CC
V
CC0
R
CCint
I
p
I
rec
()
×
=
V
CC0
V
LN
R
CC
I
CC
×
=
Fig.4 Supply configuration.
handbook, full pagewidth
LED
DRIVER
Ish
Rp
Rd
ISLPE
REG
LN
RGASint
from pre amp
SLPE
45.5 k
15.5 k
VEE
Vd
VCC
RCC
CVCC
ICC
CREG
RSLPE
Vexch
Rexch
ILED
ILED
Iline
Rline
TEA1112
TEA1112A
I
*
IP
peripheral
circuits
100
µF
4.7
µF
20
69 k
619
MBE789


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