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TEA1098TV Datasheet(PDF) 8 Page - NXP Semiconductors

No. de pieza TEA1098TV
Descripción Electrónicos  Speech and handsfree IC
Download  40 Pages
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Fabricante Electrónico  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1098TV Datasheet(HTML) 8 Page - NXP Semiconductors

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1999 Oct 14
8
Philips Semiconductors
Product specification
Speech and handsfree IC
TEA1098
The preferred value for RSLPE is 20 Ω. Changing this value
not only affects 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.
Figure 4 shows that the internal circuit is supplied by pin
VBB, which combined with the line interface is a strong
supply point.
The line current through resistor RSLPE is sunk by the VBB
voltage stabilizer, and is suitable for supplying a
loudspeaker amplifier or any peripheral IC. Voltage VBB is
3.0 V at line currents below 18 mA and rises linearly to
5.3 V when the line current rises above 45 mA. It is
temperature compensated.
The current switch TR1-TR2 is intended to reduce
distortion of large AC line signals. Current ISLPE is supplied
to VBB via TR1 when the voltage on pin SLPE is above
VBB + 0.25 V. When the voltage on pin SLPE is below this
value, ISLPE is shunted to GND via TR2.
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 at
2% Total Harmonic Distortion (THD). The external resistor
does not affect the voltage on pin VBB; see Fig.5 for the
main DC voltages.
handbook, full pagewidth
MGM298
TN2
TR2
TR1
E2
D1
D1
R3
R2
R1
TN1
TP1
J2
J1
E1
GND
GND
VBB
from
preamp
GND
REG
LN
SLPE
CREG
4.7
µF
RSLPE
20
Fig.4 Line interface principle.


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