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PDF TEA1094AM Data sheet ( Hoja de datos )
| Número de pieza | TEA1094AM | |
| Descripción | Hands free IC | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
TEA1094; TEA1094A
Hands free IC
Product specification
Supersedes data of 1996 Mar 11
File under Integrated Circuits, IC03
1996 Jul 15
1 page  
Philips Semiconductors
Hands free IC
Product specification
TEA1094; TEA1094A
PINNING
SYMBOL
DLC/MUTER
RIN1
RIN2
n.c.
GAR
LSP
n.c.
GND
n.c.
VBB
VOL
SWR
STAB
SWT
n.c.
IDT
PD
n.c.
MICGND
MUTET
MOUT
GAT
MIC
RNOI
RENV
RSEN
TNOI
TENV
TSEN
PINS
TEA1094 TEA1094A
DESCRIPTION
1 1 dynamic limiter timing adjustment; receiver channel mute input
2 2 receiver amplifier input 1
3 3 receiver amplifier input 2
4 − not connected
5 4 receiver gain adjustment
6 5 loudspeaker amplifier output
7 − not connected
8 6 ground reference
9 − not connected
10 7 supply voltage
11 8 receiver volume adjustment
12 9 switching range adjustment
13 10 reference current adjustment
14 11 switch-over timing adjustment
15 − not connected
16 12 idle mode timing adjustment
− 13 power-down input
17 − not connected
18 14 ground reference for the microphone amplifier
19 15 transmit channel mute input
20 16 microphone amplifier output
21 17 microphone gain adjustment
22 18 microphone input
23 19 receive noise envelope timing adjustment
24 20 receive signal envelope timing adjustment
25 21 receive signal envelope sensitivity adjustment
26 22 transmit noise envelope timing adjustment
27 23 transmit signal envelope timing adjustment
28 24 transmit signal envelope sensitivity adjustment
1996 Jul 15
5
5 Page 
Philips Semiconductors
Hands free IC
Product specification
TEA1094; TEA1094A
DECISION LOGIC: PINS IDT AND SWT
handbook, full pagewidth
27
(23) TENV
TNOI
26
(22)
13 mV
ATTENUATOR
24
(20) RENV
RNOI
23
(19)
13 mV
19
(15) MUTET
Vdt
from dynamic
limiter
DUPLEX CONTROLLER
LOGIC(1)
16
IDT (12)
Vref
RIDT
14
SWT (11)
X X 1 1 − 10 µA
X 1 0 X + 10 µA
1 X 0 X + 10 µA
XX1 0
0
0 00X
0
CSWT
MGD224
The pin numbers given in parenthesis refer to the TEA1094A.
(1) When MUTET = HIGH, +10 µA is forced.
When DLC/MUTER < 0.2 V, −10 µA is forced.
Fig.9 Decision logic.
The TEA1094 and TEA1094A select their modes of
operation (transmit, receive or idle mode) by comparing
the signal and the noise envelopes of both channels. This
is executed by the decision logic. The resulting voltage on
pin SWT is the input for the voice-switch.
To facilitate the distinction between signal and noise, the
signal is considered as speech when its envelope is more
than 4.3 dB above the noise envelope. At room
temperature, this is equal to a voltage difference
VENV − VNOI = 13 mV. This so called speech/noise
threshold is implemented in both channels.
The signal on MIC contains both speech and the signal
coming from the loudspeaker (acoustic coupling). When
receiving, the contribution from the loudspeaker overrules
the speech.
As a result, the signal envelope on TENV is formed mainly
by the loudspeaker signal. To correct this, an attenuator is
connected between TENV and the TENV/RENV
comparator. Its attenuation equals that applied to the
microphone amplifier.
When a dial tone is present on the line, without monitoring,
the tone would be recognized as noise because it is a
signal with a constant amplitude. This would cause the
TEA1094 (TEA1094A) to go into the idle mode and the
user of the set would hear the dial tone fade away. To
prevent this, a dial tone detector is incorporated which, in
standard applications, does not consider input signals
between RIN1 and RIN2 as noise when they have a level
greater than 127 mV (RMS). This level is proportional to
RRSEN.
1996 Jul 15
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet TEA1094AM.PDF ] | |
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