參數(shù)資料
型號： 935263449112
廠商： NXP SEMICONDUCTORS
元件分類： 無繩電話/電話
英文描述： SPEAKER PHONE CIRCUIT, PDSO40
封裝： PLASTIC, SOT-158, VSOP-40
文件頁數(shù)： 9/43頁
文件大?。?/td> 237K
代理商： 935263449112
1999 Oct 14
17
Philips Semiconductors
Product specication
Speech and handsfree IC
TEA1098
Table 1
TEA1098 modes
The switch-over timing can be set by capacitor CSWT and
the Idle mode timing can be set by capacitor CSWT and
resistor RIDT. In the basic application given in Fig.19, CSWT
is 220 nF and RIDT is 2.2 M. This enables a switch-over
time from Tx to Rx mode or vice-versa of approximately
13 ms (580 mV swing on pin SWT). The switch-over time
from Idle mode to Tx or Rx mode is approximately 4 ms
(180 mV swing on pin SWT).
The switch-over time, from Rx or Tx mode to Idle mode is
equal to 4
× RIDTCSWT and is approximately 2 seconds
(Idle mode time).
The DLC input overrides the decision logic. When the
voltage on pin DLC falls below 0.2 V, the capacitor CSWT
is discharged by 10
A which selects Tx mode.
Voice switch: pins STAB and SWR
Figure 13 is a diagram of the voice switch. With a voltage
on pin SWT, the TEA1098 voice switch regulates the gains
of the transmit and the receive channels so that the sum of
both is held constant.
In Tx mode, the microphone amplifier is at maximum gain
and the loudspeaker amplifier is at minimum gain.
In Rx mode, their gains are the opposite. In Idle mode,
both microphone and loudspeaker amplifiers are midway
between maximum and minimum gain.
The difference between the maximum and minimum gain
is called the switching range. This range is determined by
the ratio of resistors RSWR to RSTAB and is adjustable
between 0 and 52 dB. Resistor RSTAB should be 3.65 k
which sets an internally used reference current. In the
basic application diagram (Fig.19), resistor RSWR is
365 k
which results in a switching range of 40 dB.
The switch-over behaviour is illustrated in Fig.14.
In Rx mode, the gain of the loudspeaker amplifier can be
reduced using the volume control. At the same time, the
gain of the microphone amplifier increases, since the voice
switch keeps the sum of the gains constant (see dashed
curves in Fig.14). However, in Tx mode, the volume
control has no effect on the gains of the microphone or
loudspeaker amplifiers. Consequently, the switching range
is reduced when the volume is reduced. At maximum
reduction of volume, the switching range is 0 dB.
VSWT VIDT (mV)
MODE
<
180
Tx mode
0
Idle mode
> 180
Rx mode
halfpage
Gvtx + Gvrx = C
(1)
VOICE SWITCH
RSTAB
RSWR
STAB
24 (21)
25 (22)
SWR
to
microphone
amplifier
from
SWT
from
volume
control
to
loudspeaker
amplifier
DUPLEX CONTROLLER
MGL346
Fig.13 Voice switch.
(1) C = constant.
Pin numbers in parenthesis apply to the TEA1098H.
Pin numbers not in parenthesis apply to the TEA1098TV.
handbook, halfpage
400
200
0
+400
+200
Gvtx, Gvrx
VSWT VIDT (mV)
Gvtx
RVOL
(
)
11400
7600
idle
mode
3800
0
3800
7600
11400
(10 dB/div)
Tx mode
Rx mode
Gvrx
MGM305
Fig.14 Switch-over behaviour.
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