參數(shù)資料
型號(hào)： L7597
廠商： Lineage Power
英文描述： Resistive Subscriber Line Interface Circuit (SLIC), Ring Relay, and Protector (SRP) for Short Loop and TA-909 Applications(用于短環(huán)路和TA-909的電阻性用戶線接口、振鈴繼電器和保護(hù)器)
中文描述： 電阻用戶線接口電路（SLIC），環(huán)繼電器和保護(hù)（SRP）的短環(huán)路和TA - 909應(yīng)用（用于短環(huán)路和電訊- 909的電阻性用戶線接口，振鈴繼電器和保護(hù)器）
文件頁(yè)數(shù)： 28/34頁(yè)
文件大小： 564K
代理商： L7597
28
Lucent Technologies Inc.
Advance Data Sheet
March 1997
Relay, and Protector (SRP) for Short Loop and TA-909 Applications
L7597 Resistive Subscriber Line Interface Circuit (SLIC), Ring
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 10. Equivalent Complex Terminations
Both forms are equivalent to each other, and it does not
matter which form is specified. The component values
in the interface circuit of Figure 10 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,
|Z
T
| 1 kHz is the magnitude of the complex termination
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 10:
Where,
ω
= 2
π
= 1000 Hz
CR
1
R
2
is defined per Figure 10 (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
′
∞
=
=
=
R
X
= desired receive (or PCM to Tip/Ring) gain
in dB
T
X
= desired transmit (or Tip/Ring to PCM) gain
in dB
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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