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TEA1094/C1 View Datasheet(PDF) - Philips Electronics

Part Name
Description
Manufacturer
TEA1094/C1
Philips
Philips Electronics Philips
TEA1094/C1 Datasheet PDF : 28 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Philips Semiconductors
Hands free IC
Product specification
TEA1094; TEA1094A
handbook, halfpage
DLC/MUTER 1
28 TSEN
RIN1 2
27 TENV
RIN2 3
26 TNOI
n.c. 4
25 RSEN
GAR 5
24 RENV
LSP 6
23 RNOI
n.c. 7
GND 8
22 MIC
TEA1094
21 GAT
n.c. 9
VBB 10
VOL 11
20 MOUT
19 MUTET
18 MICGND
SWR 12
17 n.c.
STAB 13
16 IDT
SWT 14
15 n.c.
MGE434
handbook, halfpage
DLC/MUTER 1
24 TSEN
RIN1 2
23 TENV
RIN2 3
22 TNOI
GAR 4
21 RSEN
LSP 5
20 RENV
GND 6
19 RNOI
TEA1094A
VBB 7
18 MIC
VOL 8
17 GAT
SWR 9
16 MOUT
STAB 10
15 MUTET
SWT 11
14 MICGND
IDT 12
13 PD
MGE435
Fig.2 Pin configuration (TEA1094).
Fig.3 Pin configuration (TEA1094A).
FUNCTIONAL DESCRIPTION
General
The values given in the functional description are typical
values unless otherwise specified.
A principle diagram of the TEA106X is shown on the left
side of Fig.4. The TEA106X is a transmission circuit of the
TEA1060 family intended for hand-set operation.
It incorporates a receiving amplifier for the earpiece, a
transmit amplifier for the microphone and a hybrid.
For more details on the TEA1060 family, please refer to
“data Handbook IC03”. The right side of Fig.4 shows a
principle diagram of the TEA1094 and TEA1094A,
hands-free add-on circuits with a microphone amplifier, a
loudspeaker amplifier and a duplex controller.
As can be seen from Fig.4, a loop is formed via the
sidetone network in the transmission circuit and the
acoustic coupling between loudspeaker and microphone
of the hands-free circuit. When this loop gain is greater
than 1, howling is introduced. In a full duplex application,
this would be the case.
The loop-gain has to be much lower than 1 and therefore
has to be decreased to avoid howling. This is achieved by
the duplex controller. The duplex controller of the
TEA1094 and TEA1094A detects which channel has the
‘largest’ signal and then controls the gain of the
microphone amplifier and the loudspeaker amplifier so that
the sum of the gains remains constant.
As a result, the circuit can be in three stable modes:
1. Transmit mode (Tx mode).
The gain of the microphone amplifier is at its maximum
and the gain of the loudspeaker amplifier is at its
minimum.
2. Receive mode (Rx mode).
The gain of the loudspeaker amplifier is at its
maximum and the gain of the microphone amplifier is
at its minimum.
3. Idle mode.
The gain of the amplifiers is halfway between their
maximum and minimum value.
The difference between the maximum gain and minimum
gain is called the switching range.
1996 Jul 15
6
 

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