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TEA1098AH 数据表(PDF) 8 Page - NXP Semiconductors

部件名 TEA1098AH
功能描述  Speech and handsfree IC
Download  40 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

TEA1098AH 数据表(HTML) 8 Page - NXP Semiconductors

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2000 Mar 21
8
Philips Semiconductors
Preliminary specification
Speech and handsfree IC
TEA1098A
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
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.


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