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參數(shù)資料
| 型號： | LUCL8576BP-D |
| 英文描述： | Dual Ringing SLIC |
| 中文描述： | 雙振鈴用戶接口 |
| 文件頁數(shù)： | 22/26頁 |
| 文件大?。?/td> | 583K |
| 代理商： | LUCL8576BP-D |
22
Agere Systems Inc.
Data Sheet
May 2001
L8576B Dual Ringing SLIC
Applications
(continued)
ac Design
(continued)
5-6400a(F)
Figure 21. ac Interface Circuit Using First-Generation Codec (Blocking Capacitors Not Shown)
R
TGS
R
TGP
= 24.4 k
V
ITR
R
T2
R
x
R
T1
R
HB
CODEC
OUTPUT
DRIVE
AMP
CODEC
OP AMP
–
+
C
N
R
N1
R
N2
R
GP
R
RCV
RCVN
RCVP
–I
T/R
195
C
TGS
AX
Transmit Gain
Transmit gain will be specified as a gain from T/R to
PCM, T
X
(dB). Since PCM is referenced to 600
and
assumed to be 0 dB, and in the case of T/R being refer-
enced to some complex impedance other than 600
resistive, the effects of the impedance transformation
must be taken into account.
Again specified complex termination impedance at T/R
is of the form:
5-6396(F)
First calculate the equivalent resistance of this network
at the midband frequency of 1000 Hz.
R
EQ
=
Using R
EQ
, calculate the desired transmit gain, taking
into account the impedance transformation:
T
X
(dB) = T
X (specified[dB])
+ 20log
T
X (specified[dB])
is the specified transmit gain. 600
is the
impedance at the PCM and R
EQ
is the impedance at
the T/R. 20log
represents the power loss/gain
due to the impedance transformation.
Note in the case of a 600
pure resistive termination
at T/R 20log
= 20log
= 0.
Thus, there is no power loss/gain due to impedance
transformation and T
X
(dB) = T
X (specified[dB])
.
Finally, convert T
X
(dB) to a ratio, G
TX
:
T
X
(dB) = 20log G
TX
The ratio of R
X
/R
T2
is used to set the transmit gain:
= G
TX
x
with a dual Agere codec such as T8503
R
X
< 200 k
R
2
C
R
1
------------f
(
)
2
C
12
R
1
R
22
1
2
π
f
(
+
R
1
R
2
+
+
)
2
R
22
C
12
2
R
22
C
1
2
π
f
(
1
)
2
R
22
C
12
+
-----------------f
2
+
600
R
EQ
----------
R
EQ
600
R
EQ
600
600
600
R
T2
----------
195
M
---------
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相關(guān)代理商/技術(shù)參數(shù) |
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| LUCL8576BP-DT | 制造商:AGERE 制造商全稱:AGERE 功能描述:Dual Ringing SLIC |
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| LUCL9214AAJ-DT | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Ringing SLIC |
| LUCL9214AAU-D | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Ringing SLIC |
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