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參數(shù)資料
| 型號： | TEA1094AM |
| 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, PDSO24 |
| 封裝： | 5.30 MM, PLASTIC, MO-150AG, SOT-340-1, SSOP-24 |
| 文件頁數(shù)： | 12/28頁 |
| 文件大?。?/td> | 221K |
| 代理商： | TEA1094AM |
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1996 Jul 15
12
Philips Semiconductors
Product specification
Hands free IC
TEA1094; TEA1094A
As can be seen from Fig.9, the output of the decision logic
is a current source. The logic table gives the relationship
between the inputs and the value of the current source.
It can charge or discharge the capacitor C
SWT
with a
current of 10
μ
A (switch-over). If the current is zero, the
voltage on SWT becomes equal to the voltage on IDT via
the high-ohmic resistor R
IDT
(idling). The resulting voltage
difference between SWT and IDT determines the mode of
the TEA1094 (TEA1094A) and can vary between
400 and +400 mV (see Table 1).
Table 1
Modes of TEA1094; TEA1094A
The switch-over timing can be set with C
SWT
, the idle mode
timing with C
SWT
and R
IDT
. In the basic application given in
Fig.13, C
SWT
is 220 nF and R
IDT
is 2.2 M
. This enables a
switch-over time from transmit to receive mode or
vice-versa of approximately 13 ms (580 mV swing on
SWT). The switch-over time from idle mode to transmit
mode or receive mode is approximately 4 ms (180 mV
swing on SWT).
The switch-over time, from receive mode or transmit mode
to idle mode, is equal to 4
×
R
IDT
C
SWT
and is
approximately 2 seconds (idle mode time).
The inputs MUTET and DLC/MUTER overrule the decision
logic. When MUTET goes HIGH, the capacitor C
SWT
is
charged with 10
μ
A thus resulting in the receive mode.
When the voltage on pin DLC/MUTER goes lower than
0.2 V, the capacitor C
SWT
is discharged with 10
μ
A thus
resulting in the transmit mode.
V
OICE
-
SWITCH
:
PINS
STAB
AND
SWR
A diagram of the voice-switch is illustrated in Fig.10. With
the voltage on SWT, the TEA1094 (TEA1094A)
voice-switch regulates the gains of the transmit and the
receive channel so that the sum of both is kept constant.
In the transmit mode, the gain of the microphone amplifier
is at its maximum and the gain of the loudspeaker amplifier
is at its minimum. In the receive mode, the opposite
applies. In the idle mode, both microphone and
loudspeaker amplifier gains are halfway.
V
SWT
V
IDT
(mV)
<
180
0
>180
MODE
transmit mode
idle mode
receive mode
The difference between maximum and minimum is the so
called switching range. This range is determined by the
ratio of R
SWR
and R
STAB
and is adjustable between
0 and 52 dB. R
STAB
should be 3.65 k
and sets an
internally used reference current. In the basic application
diagram given in Fig.13, R
SWR
is 365 k
which results in a
switching range of 40 dB. The switch-over behaviour is
illustrated in Fig.11.
In the receive mode, the gain of the loudspeaker amplifier
can be reduced using the volume control. Since the
voice-switch keeps the sum of the gains constant, the gain
of the microphone amplifier is increased at the same time
(see dashed curves in Fig.11). In the transmit mode,
however, the volume control has no influence on the gain
of the microphone amplifier or the gain of the loudspeaker
amplifier. Consequently, the switching range is reduced
when the volume is reduced. At maximum reduction of
volume, the switching range becomes 0 dB.
Fig.10 Voice switch.
The pin numbers given in parenthesis refer to the TEA1094A.
(1) C = constant.
Gvtx
+
Gvrx
=
C
(1)
VOICE SWITCH
RSTAB
RSWR
STAB
13
(10)
12
(9)
SWR
to
microphone
amplifier
from
SWT
from
volume
control
to
loudspeaker
amplifier
DUPLEX CONTROLLER
MGD225
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TEA1094AT | Hands free IC |
| TEA1094T | Hands free IC |
| TF218 | Capacitor Microphone Applications |
| TFMS4300 | Transient Voltage Suppressor Diodes |
| TFMS4360 | Transient Voltage Suppressor Diodes |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| TEA1095T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Voice switched speakerphone IC |
| TEA1095TS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Voice switched speakerphone IC |
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