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TEA1098AH View Datasheet(PDF) - Philips Electronics

Part Name
Description
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TEA1098AH
Philips
Philips Electronics Philips
TEA1098AH Datasheet PDF : 40 Pages
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Philips Semiconductors
Speech and handsfree IC
Preliminary specification
TEA1098A
handbook, full pagewidLthN
REG
GND
SLPE
CREG
TP1
4.7 µF
R3
RSLPE
20
TR2
TR1
E1
D1
J1
R1
TN2
R2
from
J2
preamp
TN1
GND
GND
VBB
E2
D1
MGM298
Fig.4 Line interface principle.
As can be seen from Fig.4, 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,
thus 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.
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% THD. The voltage on pin VBB is not affected
by this external resistor; see Fig.5 for the main DC
voltages.
2000 Mar 21
8
 

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