TEA1097H Просмотр технического описания (PDF) - Philips Electronics
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TEA1097H
Philips Electronics
TEA1097H Datasheet PDF : 36 Pages
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Philips Semiconductors
Speech and loudspeaker amplifier IC with
auxiliary inputs/outputs and analog multiplexer
Product specification
TEA1097
handbook, full pagewidth
HFRX 1
n.c. 2
n.c. 3
n.c 4
n.c 5
n.c 6
n.c 7
DLC 8
ESI 9
VBB 10
GALS 11
TEA1097H
33 QR
32 DTMF
31 MIC+
30 MIC−
29 GNDTX
28 TXIN
27 GATX
26 TXOUT
25 n.c.
24 n.c.
23 VOL
FCA019
Fig.3 Pin configuration (QFP44).
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:
VLN
=
Vref
+
RSLPE
×
I
SLPE
ISLPE = Iline – Ix
where:
Iline = line current
Ix = current consumed on pin LN (approximately a
few µA)
ISLPE = current flowing through the RSLPE resistor.
1999 Apr 08
7
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