參數(shù)資料
型號(hào)： 935264477112
廠商： NXP SEMICONDUCTORS
元件分類： 無繩電話/電話
英文描述： TELEPHONE SPEECH CKT, PDSO40
封裝： PLASTIC, SOT-158, VSOP-40
文件頁(yè)數(shù)： 37/39頁(yè)
文件大?。?/td> 205K
代理商： 935264477112
1999 Apr 08
7
Philips Semiconductors
Product specication
Speech and loudspeaker amplier IC with
auxiliary inputs/outputs and analog multiplexer
TEA1097
Fig.3 Pin configuration (QFP44).
handbook, full pagewidth
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TEA1097H
FCA019
QR
DTMF
MIC
+
MIC
TXIN
GATX
TXOUT
n.c.
VOL
HFRX
n.c.
n.c
DLC
ESI
GALS
GNDTX
TXA
UX
RA
UX
A
UXC
MUTR
MUTT
PD
HFTX
RECO
GARX
A
UXO
HFC
GND
SLPE
LN
REG
IR
AG
C
MICS
ST
AB
n.c
LSA
O
V
DD
n.c
VBB
FUNCTIONAL DESCRIPTION
All data given in this chapter are typical values, except
when otherwise specified.
Supplies
LINE INTERFACE AND INTERNAL SUPPLY (PINS LN, SLPE,
REG AND VBB)
The supply for the TEA1097 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 lower
than 18 mA. It than increases linearly with the line current
and reaches the value of 6.1 V for line currents higher than
45 mA. For line currents below 9 mA, the internal
reference voltage generating Vref is automatically adjusted
to a lower value. This is the so-called low voltage area and
the TEA1097 has limited performances in this area
(see Section “Low voltage behaviour”). This 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 means of a capacitor 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 and it 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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