TEA1098 Philips Semiconductors, TEA1098 Datasheet - Page 7

• Manufacturer Part Number: TEA1098
• Description: Speech and handsfree IC
• Manufacturer: Philips Semiconductors

Philips Semiconductors
FUNCTIONAL DESCRIPTION
All data values given in this chapter are typical, except
when otherwise specified.
Supplies
L
REG
The supply for the TEA1098 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
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, V
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.
1999 Oct 14
handbook, full pagewidth
INE INTERFACE AND INTERNAL SUPPLY
Speech and handsfree IC
AND
V
ref
BB
) between pins SLPE and GND.
)
ref
is automatically adjusted to a
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
Fig.3 Pin configuration (TEA1098H).
LN, SLPE,
TEA1098H
7
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 (R
by an external impedance).
The IC regulates the line voltage at pin LN which can be
calculated as follows:
where:
I
I
few A).
I
V
I
line
x
SLPE
SLPE
LN
= current consumed on pin LN (approximately a
= line current.
=
= current flowing through the R
=
V
ref
I
line
+
R
–
SLPE
I
x
I
33
32
31
30
28
27
26
25
24
23
29
SLPE
FCA020
QR
DTMF
MIC
MIC
GNDTX
TXIN
GATX
TXOUT
IDT
SWT
VOL
SLPE
) to its AC value (done
SLPE
Product specification
TEA1098
resistor.