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參數(shù)資料
| 型號(hào)： | TEA7092 |
| 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)： | 21/57頁(yè) |
| 文件大?。?/td> | 574K |
| 代理商： | TEA7092 |
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II - SPEECHFEATURES
(continued)
II.3 - Transmit Channel
(continued)
Figure 28 gives the transmit line level at
Pin V
L
(Pin3)andthe transmitdistortionversusthe
input microphone level (Pin MIC1 (Pin 23) &
Pin MIC2 (Pin 24)) for R12 = 82k
, R1 = 47k
&
R8 = 1.62k
.
Figure 28 :
TxOutputLevel& Distortion(I
L
=20mA)
I
L
(mA)
d
0
20
40
60
80
100
-6
-4
-2
0
R18 = 18k
R18 = 10k
R18 = 8.2k
R18 = 6.8k
R18 = 5.6k
A
Figure 31 :
dGtx = f(I
L
)
0.2
0.5
1
2
5
10
20
50 100
V
MIC
(mV
RMS
)
0.05
0.1
0.2
0.5
1
2
0
2
4
6
8
10
12
V
L
(
D
L
]
V
Distortion
A
Figure 29 gives the maximum transmit level at
Pin V
L
(Pin 3) versus R1, for R3 = 2.7k
& for
different valuesof R12, at I
L
= 40mA.
Figure 29 :
Vac Max On Line
II.3.3- Line LossCompensation/
A.G.C. Adjustment
The TEA7092 uses a line current information to
control the transmit and receive gains variation
versus the linecurrent.
TheAutomaticGainControl(A.G.C.)versuslinelength
worksinthesamewayfortransmitandreceivepaths.
Throughtwoexternalresistors theline currentvari-
ation, where the A.G.C.occurs, is programmable:
- R18 connected on Pin ILL (Pin 33) sets up the
start up line current value, I
LL
, forthe A.G.C.
R18
=
I
LL
5.6in k
; I
LL
in mA
- R19 connected on Pin ISL (Pin 34) sets up the
slope and the line current value, I
SL
, where the
300
transmit andreceivegainsare equalto the maxi-
mum gain valueminus 6dB.
R19
=
I
SL
5.6in k
; I
SL
in mA
For line current values lower than I
LL
, the transmit
and receive gains stay at theirmaximum values.
For line current valuesupper than I
SL
, the transmit
and receive gains stay at theirminimum values.
Figure30 gives A.G.C. with a constant start value
(I
L
= 20mA) and different values of R19.
Figure 31 gives A.G.C. with a constantstop value
(I
L
= 100mA) and differentvalues of R18.
Figure 30 :
dGtx = f(I
L
)
300
R1 (k
)
0
0.25
0.5
0.75
1
1.25
V
L
(
1.5
0
20
40
60
80
100
120
1.75
2
2.25
2.5
2.75
3
3.25
R12 = 68k
R12 = 82k
R12 = 110k
A
II.3.4 - A.G.C. Inhibition
The A.G.C. feature can be inhibited through the
serial bus interfaceby sending the code 0010100.
This code is a toggle one.
Whenthe no A.G.C. mode is selected the transmit
and receive gains stay at their maximum values
-2dB over the line current rangevariation.
This feature is used for a telephoneset connected
behind a PABX or in a country where the A.G.C.
feature is not requested.
I
L
(mA)
d
0
20
40
60
80
100
-6
-4
-2
0
R19 = 8.2k
R19 = 6.8k
R19 = 4.7k
R19 = 3.9k
R19 = 3.3k
A
TEA7092 - TELEPHONE SET INTEGRATEDCIRCUIT
21/57
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TEA7092TQ | TELEPHONE ANALOG FRONT END |
| TEA7092TQT | TELEPHONE ANALOG FRONT END |
| TEA7530DP | MONITOR AMPLIFIER |
| TEA7530FP | MONITOR AMPLIFIER |
| TEA7530 | Monitor Amplifier(監(jiān)聽(tīng)放大器) |
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| TEA7092TQ | 制造商:STMicroelectronics 功能描述:SPEECH NETWORK ADVANCED 46DB 44TQFP - Trays |
| TEA7092TQT | 制造商:STMicroelectronics 功能描述:SPEECH NETWORK ADVANCED 46DB 44TQFP - Tape and Reel |
| TEA7530 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:MONITOR AMPLIFIER |
| TEA7530DP | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:MONITOR AMPLIFIER |
| TEA7530FP | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:MONITOR AMPLIFIER |
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