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參數(shù)資料
| 型號： | 935263449118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | SPEAKER PHONE CIRCUIT, PDSO40 |
| 封裝： | PLASTIC, SOT-158, VSOP-40 |
| 文件頁數(shù)： | 41/43頁 |
| 文件大?。?/td> | 237K |
| 代理商： | 935263449118 |
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1999 Oct 14
7
Philips Semiconductors
Product specication
Speech and handsfree IC
TEA1098
handbook, full pagewidth
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33
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44
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34
TEA1098H
FCA020
QR
DTMF
MIC
+
MIC
TXIN
GATX
TXOUT
IDT
SWT
VOL
HFRX
TNOI
TENV
TSEN
RNOI
RSEN
DLC
n.c.
GALS
GNDTX
n.c.
MUTE
PD
HFTX
RECO
GARX
n.c.
HFC
GND
SLPE
LN
REG
IR
AG
C
MICS
ST
AB
SWR
LSA
O
V
DD
RENV
VBB
Fig.3 Pin configuration (TEA1098H).
FUNCTIONAL DESCRIPTION
All data values given in this chapter are typical, except
when otherwise specified.
Supplies
LINE INTERFACE AND INTERNAL SUPPLY (PINS LN, SLPE,
REG AND VBB)
The supply for the TEA1098 and its peripherals is obtained
from the line. The IC generates a stabilized reference
voltage (Vref) between pins SLPE and GND.
This reference voltage is equal to 3.7 V for line currents
below 18 mA. When the line current rises above 45 mA,
the reference voltage rises linearly to 6.1 V. For line
currents below 9 mA, Vref is automatically adjusted to a
lower value. The performance of the TEA1098 in this
so-called low voltage area is limited (see Section “Low
voltage behaviour”). The reference voltage is temperature
compensated.
The voltage between pins SLPE and REG is used by the
internal regulator to generate the stabilized reference
voltage and is decoupled by a capacitor connected
between pins LN and REG. This capacitor, converted into
an equivalent inductance realizes the set impedance
conversion from its DC value (RSLPE) to its AC value (done
by an external impedance).
The IC regulates the line voltage at pin LN which can be
calculated as follows:
where:
Iline = line current.
Ix = current consumed on pin LN (approximately a
few
A).
ISLPE = current flowing through the RSLPE resistor.
V
LN
V
ref
R
SLPE
I
SLPE
×
+
=
I
SLPE
I
line
I
x
–
=
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