參數(shù)資料
型號(hào)： TEA1098AH
廠商： NXP Semiconductors N.V.
英文描述： Speech and handsfree IC
中文描述： 免提語(yǔ)音和集成電路
文件頁(yè)數(shù)： 7/40頁(yè)
文件大?。?/td> 185K
代理商： TEA1098AH
2000 Mar 21
7
Philips Semiconductors
Preliminary specification
Speech and handsfree IC
TEA1098A
handbook, full pagewidth
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TEA1098AH
FCA142
EARO
DTMF
MIC
+
MIC
TXI
GATX
TXO
IDT
SWT
n.c.
HFRX
TNOI
TENV
TSEN
RNOI
RSEN
DLC
n.c.
GALS
GNDTX
n
L
E
B
M
P
H
R
G
n
H
G
S
L
R
I
A
M
S
S
L
V
RENV
VBB
Fig.3 Pin configuration (TEA1098AH).
FUNCTIONAL DESCRIPTION
All data given in this chapter are typical values, except
when otherwise specified.
Supplies
L
INE INTERFACE AND INTERNAL SUPPLY
(
PINS
LN, SLPE,
REG
AND
V
BB
)
The supply for the TEA1098A and its peripherals is
obtained from the line. The IC generates a stabilized
reference voltage (V
ref
) 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 V
ref
is automatically
adjusted to a lower value. This is the so-called low voltage
area and the TEA1098A 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
voltageandisdecoupledbymeansofacapacitor between
pins LN and REG.
This capacitor converted into an equivalent inductance
realizes the set impedance conversion from its DC value
(R
SLPE
) to its AC value (done by an external impedance).
The IC regulates the line voltage at pin LN and can be
calculated as follows:
where:
I
line
= line current
I
x
= current consumed on pin LN (approximately a few
μ
A)
I
SLPE
= current flowing through the R
SLPE
resistor
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.
V
LN
V
ref
R
SLPE
I
×
+
SLPE
=
I
SLPE
I
line
I
x
–
=
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