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參數(shù)資料
| 型號(hào)： | TEA7092TQT |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | TELEPHONE ANALOG FRONT END |
| 中文描述： | 電話模擬前端 |
| 文件頁(yè)數(shù)： | 19/57頁(yè) |
| 文件大?。?/td> | 574K |
| 代理商： | TEA7092TQT |
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II - SPEECHFEATURES
(continued)
II.3 - TransmitChannel
II.3.1- General Information
(Maximum Gain Adjustment)
The transmit path amplifies several signals :
- The handsetmicrophone.
- The handfreemicrophone.
- The DTMFsinewave.
- The waitingmelodysinewave.
At onetime, only one of these signals is amplified,
the choiceis made throughthe serial busintercon-
nected with the microcontroller.
Figure 25 gives the transmit channel block dia-
gram.
Figure 25 :
Transmit Channel BlockDiagram
The first switch selects the microphoneused.
The signal coming from the handset microphone,
PinsMIC1 & MIC2 (Pins 23 & 24) is limitedby the
softclipping stage, more details are given in Sec-
tion II.3.2 ”Softclippingthreshold”on this stage.Its
gain depends on the gain control stage program-
ming,more details are given in SectionII.3.3 ”Line
loss compensation A.G.C. adjustment”. Its abso-
lute value is adjusted on the final stage with
Pin GTR (Pin 21).
The output signal of the handset microphone pre-
amplifier is used for the squelch feature.
C32
23
MIC1
24
MIC2
25
V
REF
20k
20k
2k
18k
22
HFIN
0dB
0dB
1k
0dB
9k
42
DTMF2
10k
7
DTMF1
I
DTMF
or I
SINWAVE
Microphone
Choice
AGC
0 to -6dB
Mute
45k
V
REF
5k
I
/85
from DC Path
1
2
21
25
V
REF
GTR
R8
LOUDSPEAKER
CURRENTSOURCE
Mirror 1/40
ITX/41
V
LS
C1
+
ITX
Gtl = 20log (820x
)
ZB
R8//50k
C13
1
C14
+
To Loudspeaker
Amplifier
17
18
C25
C16
R16
ASQ
ASC
27
28
R4
TSOFT
SOFTL
R1
C3
SOFTCLIPPING
STAGE
3
V
L
19
RECIN
R11a+ R11b
ZB = ZT//CR1//ZL
I
L
TEA7092
ANTI-ACOUSTIC
FEEDBACK
STAGE
A
TEA7092 - TELEPHONE SET INTEGRATEDCIRCUIT
19/57
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