TEA1099 Просмотр технического описания (PDF) - Philips Electronics
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TEA1099
Philips Electronics
TEA1099 Datasheet PDF : 40 Pages
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Philips Semiconductors
Speech and handsfree IC with auxiliary
inputs/outputs and analog multiplexer
Product specification
TEA1099H
The preferred value for RSLPE is 20 Ω. Changing this value
will affect more than the DC characteristics; it also
influences the transmit gains to the line, the gain control
characteristic, the sidetone level and the maximum output
swing on the line.
As can be seen from Fig.3, the internal circuitry is supplied
by pin VBB, which is a strong supply point combined with
the line interface. The line current is flowing through the
RSLPE resistor and is sunk by the VBB voltage stabilizer,
becoming available for a loudspeaker amplifier or any
peripheral IC. Its voltage is equal to 3.0 V for line currents
lower than 18 mA. It than increases linearly with the line
current and reaches the value of 5.3 V for line currents
greater than 45 mA. It is temperature compensated.
See Fig.4 for the main DC voltages.
The aim of the current switch TR1 and TR2 is to reduce
distortion of large AC line signals. Current ISLPE is supplied
to VBB via TR1 when the voltage on SLPE is greater than
VBB + 0.25 V. When the voltage on SLPE is lower than this
value, the current ISLPE is shunted to GND via TR2.
The reference voltage Vref can be increased by connecting
an external resistor between pins REG and SLPE.
For large line currents, this increase can slightly affect
some dynamic performances such as maximum signal
level on the line for 2% Total Harmonic Distortion (THD).
The voltage on pin VBB is not affected by this external
resistor.
handbook, full pagewidLthN
REG
GND
SLPE
CREG
TP1
4.7 µF
R3
RSLPE
20 Ω
TR2
TR1
E1
D1
J1
R1
R2
from
preamp
TN1
TN2
J2
GND
Fig.3 Line interface principle.
GND
VBB
E2
D1
MGM298
1999 Apr 08
7
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