參數(shù)資料
型號(hào)： 935264477118
廠商： NXP SEMICONDUCTORS
元件分類： 無(wú)繩電話/電話
英文描述： TELEPHONE SPEECH CKT, PDSO40
封裝： PLASTIC, SOT-158, VSOP-40
文件頁(yè)數(shù)： 38/39頁(yè)
文件大小： 205K
代理商： 935264477118
1999 Apr 08
8
Philips Semiconductors
Product specication
Speech and loudspeaker amplier IC with
auxiliary inputs/outputs and analog multiplexer
TEA1097
The preferred value for RSLPE is 20 . 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
R3
R2
R1
TN1
TP1
J2
J1
E1
GND
VBB
from
preamp
GND
REG
LN
SLPE
CREG
4.7
F
RSLPE
20
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