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| 型號： | L8575 |
| 英文描述： | Dual-Resistive,Low-Cost Subscriber Line Interface Circuit(SLIC) |
| 中文描述： | 雙電阻，低成本用戶線接口電路（SLIC） |
| 文件頁數(shù)： | 29/36頁 |
| 文件大小： | 633K |
| 代理商： | L8575 |
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Advance Data Sheet
March 1997
L8575
Dual-Resistive, Low-Cost SLIC
Lucent Technologies Inc.
29
ac Design
(continued)
Design Equations
The following section gives the relevant design equa-
tions to choose component values for any desired gain,
termination and balance network, assuming a complex
termination is desired. Complex termination will be
specified in one of the two forms shown below:
12-3425(F)
Figure 12. Equivalent Complex Terminations
Both forms are equivalent to each other, and it does
not matter which form is specified. The component val-
ues in the interface circuit of Figure 12 are calculated
assuming the parallel form is specified. If the termina-
tion impedance to be synthesized is specified in the
series form, convert it to the parallel form using the
equations below:
Note that if the termination impedance is specified as
pure resistive:
Define the gain constant, K, as follows:
Where,
R
X
= desired receive (or PCM to Tip/Ring)
gain in dB
T
X
= desired transmit (or Tip/Ring to PCM)
gain in dB
|Z
T
| 1 kHz is the magnitude of the complex termina-
tion impedance Z
T
being synthesized, calculated at
1000 Hz. This equation assumes that the TLP of the
codec is 0 dBm referenced to 600
.
The following equation applies when referring to
Figure 13:
Where,
ω
= 2
π
= 1000 Hz
CR
1
R
2
is defined per Figure 12 (series form), and
R1
R2
C
R2′
R1′
C′
(SERIES FORM)
(PARALLEL FORM)
R
1
′
R
1
R
2
+
=
12
R
R
2
′
R
2
R
1
R
2
2
1
R
2
+
=
C
′
1
R
1
R
2
R
2
+
+
------------------C
=
R
2
R
2
′
0 and C = C
′
∞
=
=
=
K
RCV
K
0
10
Rx/20
for receive gain
0
=
K
TX
K
10
Tx/20
for transmit gain
=
K
0
T
1
kHz
600
Z
=
= power transfer ratio
Z
T
2
2
R
1
R
22
-------C
R
1
ω
2
R
22
C
2
R
2
j
ω
R
22
C
–
+
+
1
+
=
Z
T
2
2
R
1
R
22
1
R
1
R
2
+
+
ω
2
R
22
C
2
+
-------C
2
22
C
ω
2
R
22
C
2
+
1
------------R
2
+
=
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