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TEA1097 Datasheet(PDF) 8 Page - NXP Semiconductors

No. de pieza TEA1097
Descripción Electrónicos  Speech and loudspeaker amplifier IC with auxiliary inputs/outputs and analog multiplexer
Download  36 Pages
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Fabricante Electrónico  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1097 Datasheet(HTML) 8 Page - NXP Semiconductors

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1999 Apr 08
8
Philips Semiconductors
Product specification
Speech and loudspeaker amplifier IC with
auxiliary inputs/outputs and analog multiplexer
TEA1097
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.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,
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.
Fig.4 Line interface principle.
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


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