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參數(shù)資料
| 型號： | TEA1094 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Hands free IC |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDIP28 |
| 封裝： | 0.600 INCH, PLASTIC, MO-015AH, SOT-117-1, DIP-28 |
| 文件頁數(shù)： | 6/28頁 |
| 文件大?。?/td> | 221K |
| 代理商： | TEA1094 |
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1996 Jul 15
6
Philips Semiconductors
Product specification
Hands free IC
TEA1094; TEA1094A
Fig.2 Pin configuration (TEA1094).
handbook, halfpage
RIN1
RIN2
n.c.
GAR
LSP
n.c.
GND
n.c.
VBB
VOL
SWR
STAB
SWT
TSEN
TENV
TNOI
RSEN
RNOI
MIC
RENV
GAT
MOUT
MUTET
MICGND
n.c.
IDT
n.c.
1
2
3
4
5
6
7
8
9
10
11
12
13
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
TEA1094
MGE434
Fig.3 Pin configuration (TEA1094A).
handbook, halfpage
DLC/MUTER
RIN1
RIN2
GAR
LSP
GND
VBB
VOL
SWR
STAB
SWT
IDT
TSEN
TENV
TNOI
RSEN
RNOI
MIC
RENV
GAT
MOUT
MUTET
MICGND
PD
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
TEA1094A
MGE435
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TEA1094A | Hands free IC |
| TEA1094AM | Hands free IC |
| TEA1094AT | Hands free IC |
| TEA1094T | Hands free IC |
| TF218 | Capacitor Microphone Applications |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TEA1094A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Hands free IC |
| TEA1094AM | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Hands free IC |
| TEA1094AT | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Hands free IC |
| TEA1094T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Hands free IC |
| TEA1095 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Voice switched speakerphone IC |
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