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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 18/57頁 |
| 文件大小： | 574K |
| 代理商： | TEA7092 |
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II - SPEECHFEATURES
(continued)
II.2 - Impedance
Figure 22 :
TEA7092Application Impedance
R
C
32
26
Z
31
30
3
19
16
15
TEA7092
SLPE
R3
AGND
V
CC
R
C
V
S
R11a
R11b
RECIN
V
L
SNLL
SNSL
C27
C12
C
R9
C9
R10
C8
V
LDC
+ V
LAC
R6
C5
R5
R
C
R29
ZT
ZASL
ZALL
R13
R27
Zimp =
V
LAC
I
LAC
I
LDC
+ I
LAC
A
ZT
Allows the user to adjust the set impedance
by changing the value of R10, R9 and C9 ;
In this way the impedance can be adjusted
asarealone(onlyR10)orasacomplexone
(R10, R9, C9).
Sidetonenetworkswhicharein parallel with
ZT, if the ratio : R13/R11a>>1and
R27/(R11a+R11b)>>1,ZALL and ZASLare
negligiblefor the impedancecalculation.
Is the internal impedance of TEA7092.
It includes the impedance of the transmit
path which is equivalent to a current source
in parallelwith Cpc (3nF), the impedanceof
all the other stageswhich are equivalent to
Rpc (15k
) andtheimpedanceof the shunt
regulator stage (AC/DC decoupling stage)
made on Pin 30 (V
S
).
ZALL
ZALS
ZIC
TEA7092application impedanceis :
Zimp = ZT//ZIC//(ZALL+ R11a + R11b)
//(ZASL+ R11a)//CR1
As it will be describe in Section II.4, the sidetone
networks areequal to :
R27
R11a
+
R11b
(
ZT//CR1//
ZLL
)
ZASL
=
R13
R11a
(
ZT//
CR1
//ZSL
)
Where ZLL is the long line impedance,and ZSLis
the shortline impedance.
IfR27/(R11a+R11b)and R13/R11aarehigherthan
100 (R27 andR13 = 3.3k
) :
ZALL and ZASL>> ZT and : Zimp= ZT//ZIC//CR1
Figure 24 and the Table 1 givethe TEA7092appli-
cation characteristicsat I
L
= 40mA.
ZALL
=
Table 1
(
RI
=
20
log[Zimp
+
600]
600]
)
Frequency
(Hz)
Real
Part ()
Imaginary
Part ()
Module ()
Phase
(deg)
Return
Loss
[Rl] (dB)
21.7
24.2
34.6
38.8
42.1
32.6
28.8
25
22
19.8
17.3
200
300
800
1 000
1 500
2 500
3 500
5 000
7 000
9 000
12 000
550
573
604
606
608
606
603
597
589
579
560
80
67
22
12
-5
-28
-43
-67
-94
-119
-154
556
577
605
607
608
607
605
601
596
591
581
8
7
2
1
0
-3
-4
-6
-9
-12
-15
8
0.1
12
16
20
24
28
32
36
40
0.2 0.3
0.5
1
2
3
5
10
f (kHz)
R
I
L
=20mA
I
=100mA
CountryLimit
Request
A
Figure 24 :
ReturnLoss
Rslp
Lsh
Zsh=R3 + (j x 2 x
π
x f x R3 x R12 x C11)
55
Regulator Shunt
Impedance
A
Figure 23 :
Zsh Impedance
TEA7092 - TELEPHONE SET INTEGRATED CIRCUIT
18/57
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