TEA1098ATV PHILIPS [NXP Semiconductors], TEA1098ATV Datasheet - Page 7

• Manufacturer Part Number: TEA1098ATV
• Description: Speech and handsfree IC
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
FUNCTIONAL DESCRIPTION
All data given in this chapter are typical values, except
when otherwise specified.
Supplies
L
REG
The supply for the TEA1098A and its peripherals is
obtained from the line. The IC generates a stabilized
reference voltage (V
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
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
voltage and is decoupled by means of a capacitor between
pins LN and REG.
2000 Mar 21
handbook, full pagewidth
INE INTERFACE AND INTERNAL SUPPLY
Speech and handsfree IC
AND
V
BB
)
ref
) between pins SLPE and GND.
RSEN
RENV
HFRX
TENV
TSEN
GALS
RNOI
TNOI
DLC
V BB
n.c.
10
11
1
2
3
4
5
6
7
8
9
(
PINS
ref
Fig.3 Pin configuration (TEA1098AH).
is automatically
LN, SLPE,
TEA1098AH
7
This capacitor converted into an equivalent inductance
realizes the set impedance conversion from its DC value
(R
The IC regulates the line voltage at pin LN and can be
calculated as follows:
where:
I
I
I
The preferred value for R
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
I
line
x
SLPE
SLPE
LN
= current consumed on pin LN (approximately a few A)
SLPE
= line current
=
= current flowing through the R
) to its AC value (done by an external impedance).
=
V
ref
I
line
+
–
R
I
SLPE
x
33
32
31
30
28
27
26
25
24
23
29
FCA142
I
SLPE
EARO
DTMF
MIC
MIC
GNDTX
TXI
GATX
TXO
IDT
SWT
n.c.
SLPE
is 20 . Changing this value
Preliminary specification
SLPE
TEA1098A
resistor