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TEA1111A View Datasheet(PDF) - Philips Electronics

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TEA1111A Datasheet PDF : 24 Pages
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Philips Semiconductors
Speech circuit with dialler interface, regulated
supply and earpiece volume control
Product specification
TEA1111A
This means that several sets can operate in parallel with
DC line voltages (excluding the polarity guard) down to an
absolute minimum voltage of 1.5 V. At line currents below
Ilow, the circuit has limited sending and receiving levels.
This is called the low voltage area.
THE INTERNAL SUPPLY POINT (PIN VCC)
The internal circuitry of the TEA1111A 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 some external circuits.
The VCC voltage (see also Figs 4 and 5) depends on the
current consumed by the IC and the peripheral circuits as:
VCC0 = VLN RCC × ICC
VCC = VCC0 RCC × (IP + Irec)
Where Irec is the current consumed by the output stage of
the earpiece amplifier.
handbook, full pagewidth
Rline
Iline
ILEDC
RCC
ILN
ICC
LED
CIRCUIT
LEDC
REXCH
LED
CONTROL
LN
VCC
from preamplifier
ISUP
internal
circuitry
VDD
REGULATOR
VDD
IDD
CVCC
IP
100 µF
external
circuits
VEXCH
SLPE
ISLPE
RSLPE
20
TEA1111A
REG
VEE
CREG
4.7 µF
peripherals
CVDD
220 µF
FCA053
1999 Nov 22
Fig.3 Supply configuration.
5
 

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