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| 型號(hào)： | LUCL9214AAJ-DT |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; MIL SPEC:MIL-C-5015; Body Material:Metal; Series:GT; No. of Contacts:2; Connector Shell Size:24; Connecting Termination:Solder; Circular Shell Style:Square Flange Receptacle; Body Style:Straight |
| 中文描述： | 低成本振鈴用戶接口 |
| 文件頁(yè)數(shù)： | 35/46頁(yè) |
| 文件大?。?/td> | 790K |
| 代理商： | LUCL9214AAJ-DT |
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Preliminary Data Sheet
October 2001
Low-Cost Ringing SLIC
L9214A/G
Agere Systems Inc.
35
ac Applications
(continued)
Design Examples
(continued)
ac Interface Using First-Generation Codec
(continued)
5-6400.H (F)
Figure 15. Interface Circuit Using First-Generation Codec (Blocking Capacitors Not Shown)
0.1
μ
F
R
TGS
V
TX
R
GX
= 4750
T
XI
V
ITR
R
T6
R
x
R
T3
R
HB
CODEC
OUTPUT
DRIVE
AMP
CODEC
OP AMP
–
+
20
C
N
R
N1
R
N2
R
GP
R
RCV
–
I
T/R
318.25
C
GS
RCVN
RCVP
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
=
-----------f
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
Tip and ring. 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
T6
is used to set the transmit gain:
= g
tx
with a quad Agere codec
such as T7504:
R
X
< 200 k
R
2
C
R
1
)
2
C
12
R
1
R
22
1
2
π
f
(
+
R
1
R
2
+
+
)
2
R
22
C
12
2
R
22
C
12
2
π
f
(
)
2
R
22
C
12
1
+
-----------------f
2
+
R
EQ
600
R
EQ
600
R
EQ
600
600
600
R
T6
----------
20
318.25
M
1
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