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參數(shù)資料
| 型號(hào)： | TEA1099H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Speech and handsfree IC with auxiliary inputs/outputs and analog multiplexer |
| 中文描述： | TELEPHONE SPEECH CKT, PQFP44 |
| 封裝： | 10 X 10 MM, 1.75 MM HEIGHT, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 7/40頁 |
| 文件大小： | 185K |
| 代理商： | TEA1099H |
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1999 Apr 08
7
Philips Semiconductors
Product specification
Speech and handsfree IC with auxiliary
inputs/outputs and analog multiplexer
TEA1099H
The preferred value for R
SLPE
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.3, the internal circuitry is supplied
by pin V
BB
, which is a strong supply point combined with
the line interface. The line current is flowing through the
R
SLPE
resistor and is sunk by the V
BB
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.
See Fig.4 for the main DC voltages.
The aim of the current switch TR1 and TR2 is to reduce
distortion of large AC line signals. Current I
SLPE
is supplied
to V
BB
via TR1 when the voltage on SLPE is greater than
V
BB
+ 0.25 V. When the voltage on SLPE is lower than this
value, the current I
SLPE
is shunted to GND via TR2.
The reference voltage V
ref
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% Total Harmonic Distortion (THD).
The voltage on pin V
BB
is not affected by this external
resistor.
Fig.3 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
SLPE
CREG
4.7
μ
F
RSLPE
20
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