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參數(shù)資料
| 型號： | TEA1098A |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Speech and handsfree IC |
| 中文描述： | 免提語音和集成電路 |
| 文件頁數(shù)： | 17/40頁 |
| 文件大?。?/td> | 185K |
| 代理商： | TEA1098A |
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2000 Mar 21
17
Philips Semiconductors
Preliminary specification
Speech and handsfree IC
TEA1098A
In the same way, a transmit detector is integrated which, in
standard applications, does not consider input signals
between pins TXI and GNDTX as noise when they have a
level greater than 0.75 mV (RMS). This level is
proportional to R
TSEN
.
As can be seen from Fig.12, 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 pin SWT becomes equal to the
voltage on pin IDT via the high-ohmic resistor R
IDT
(idling).
The resulting voltage difference between pins SWT and
IDT determines the mode of the TEA1098A and can vary
between
400 and +400 mV (see Table 1).
Table 1
Modes of TEA1098A
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.18, 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
pin SWT). The switch-over time from Idle mode to transmit
mode or receive mode is approximately 4 ms (180 mV
swing on pin SWT).
The switch-over time, from receive mode or transmit mode
toIdlemodeisequalto4
×
R
IDT
C
SWT
andisapproximately
2 seconds (Idle mode time).
The input at pin DLC overrules the decision logic. When
the voltage on pin DLC goes lower than 0.2 V, the
capacitor C
SWT
is discharged with 10
μ
A thus resulting in
the transmit mode.
Voice-switch (pins STAB and SWR)
A diagram of the voice-switch is illustrated in Fig.13. With
the voltage on pin SWT, the TEA1098A voice-switch
regulates the gains of the transmit and the receive
channels 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.
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.18, R
SWR
is 365 k
which results in a
switching range of 40 dB. The switch-over behaviour is
illustrated in Fig.14.
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.14). 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.
V
SWT
V
IDT
(mV)
<
180
0
>180
MODE
transmit mode
Idle mode
receive mode
Gvtx
+
Gvrx
=
C
(1)
VOICE SWITCH
RSTAB
RSWR
STAB
25 (21)
26 (22) SWR
to
microphone
amplifier
from
SWT
from
volume
control
to
loudspeaker
amplifier
DUPLEX CONTROLLER
FCA154
Fig.13 Voice switch.
(1) C = constant.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TEA1098AH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Speech and handsfree IC |
| TEA1098ATV | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Speech and handsfree IC |
| TEA1098H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Speech and handsfree IC |
| TEA1098TV | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Speech and handsfree IC |
| TEA1098UH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Speech and handsfree IC |
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