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參數(shù)資料
| 型號： | TEA7092TQT |
| 廠商： | 意法半導體 |
| 英文描述： | TELEPHONE ANALOG FRONT END |
| 中文描述： | 電話模擬前端 |
| 文件頁數(shù)： | 22/57頁 |
| 文件大?。?/td> | 574K |
| 代理商： | TEA7092TQT |
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II - SPEECHFEATURES
(continued)
II.3.5- TransmitSquelch / Antiacoustic Feedback Stage
100k
0.5k
From
Microphone
Preamplifier
0.8k
V
REF
60mV
To Transmit
AGC
LS AGC
60mV
17
ASQ
25
V
REF
18
ASC
R16
TEA7092
C16
C25
10
μ
A
V
CC
A
Figure 32 :
BlockDiagram
V
MIC
(dBV) (Pins 23 & 24)
G
-56
-60
-64
38
40
44
-68
-72
-76
-80
36
42
C25= 100nF
C25= 470nF
C25= 1
μ
F
A
Figure34:
SquelchThreshold(I
L
=20mA/f
MIC
=1kHz)
The same stage is used for the transmit squelch
and the antiacoustic feedback feature which is
used in loudspeakingmode. Figure 32 shows the
blockdiagram of thisstage.
Whenthereisnosignalon thehandsetmicrophone
inputs, the transmit gain is reduced by 9dB, refer
to the maximumgain, and the loudspeakerampli-
fier is at the gain value set by the volume control
stage, (see Section III - CALLPROGRESS MONI-
TOR AND GROUP LISTENING MODES). When
the handset microphone signal is present and in-
creases progressively, it describes the first curve in
Figure 33 and the loudspeaker amplifier describes
thesecondcurvein Figure33.Theattenuationofthe
loudspeaker amplifier for the antiacousticfeatureis
programmablefrom 10dBto25dBthroughtheserial
businterface,thedefaultvalueis15dB.The squelch
thresholdfeaturecanbe inhibitedthroughtheserial
bus interfaceby sendingthe code (0011001)with-
out affectingtheantiacousticfeedbackcontrol.This
code is a toggle one. The squelch threshold level
is adjustablethrough theC25 capacitorvalue con-
nected at Pin ASQ (Pin 18). Be aware that when
thethresholdlevelismodified,thecut-offfrequency
of the filter is also modified. The squelchthreshold
levelisdeterminedbythemicrophonelevelinjectedat
Pins MIC1 & MIC2 (Pins 23 & 24). Figure 34 gives
the threshold level with a maximum transmit gain
of 44dB.
Normal Speech
x is Programmable through the Serial Bus
(10,15, 20, 25dB)(default value is 15dB)
Low
Microphone
Level
Gmax
Gmax - 9.5dB
* 60mV at Pin17
*
GLS
GLS - xdB
Vsl
Vst
Vsoft
Gtx (dB)
GLS is Programmablethrough
the Volume Control Stage
V
MIC
High MicrophoneSignal
Softclipping Mode
V
MIC
9dB
3dB
A
Figure33
TEA7092 - TELEPHONE SET INTEGRATED CIRCUIT
22/57
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