tea1097h NXP Semiconductors, tea1097h Datasheet - Page 7

• Manufacturer Part Number: tea1097h
• Description: Speech And Loudspeaker Amplifier Ic With Auxiliary Inputs/outputs And Analog Multiplexer
• Manufacturer: 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 TEA1097 and its peripherals is obtained
from the line. The IC generates a stabilized reference
voltage (V
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
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.
1999 Apr 08
handbook, full pagewidth
INE INTERFACE AND INTERNAL SUPPLY
Speech and loudspeaker amplifier IC with
auxiliary inputs/outputs and analog multiplexer
AND
V
ref
BB
) between pins SLPE and GND. This
)
ref
HFRX
GALS
DLC
V BB
n.c.
n.c.
ESI
is automatically adjusted
n.c
n.c
n.c
n.c
10
11
6
7
1
2
3
4
5
8
9
(
PINS
Fig.3 Pin configuration (QFP44).
LN, SLPE,
TEA1097H
7
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
(R
The IC regulates the line voltage at pin LN and it can be
calculated as follows:
where:
V
I
SLPE
LN
I
I
few A)
I
SLPE
line
x
SLPE
= current consumed on pin LN (approximately a
=
= line current
) to its AC value (done by an external impedance).
=
V
= current flowing through the R
ref
I
line
+
–
R
I
SLPE
x
I
SLPE
33
32
31
30
29
28
27
26
25
24
23
FCA019
QR
DTMF
MIC
MIC
GNDTX
TXIN
GATX
TXOUT
n.c.
n.c.
VOL
Product specification
SLPE
TEA1097
resistor.