參數(shù)資料
型號: AM79C30AJC
廠商: ADVANCED MICRO DEVICES INC
元件分類: 數(shù)字傳輸電路
英文描述: Digital Subscriber Controller⑩ (DSC⑩) Circuit
中文描述: DATACOM, DIGITAL SLIC, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 79/101頁
文件大小: 1607K
代理商: AM79C30AJC
Am79C30A/32A Data Sheet
79
Figure 28.
Equivalent DC Circuit at LOUT Pins for Calculation of R
1
and R
2
Series Resistor Calculations
Equation 1
Equation 2
Equation 3
Let R
1
= R
2
Equation 4
Notes:
N = 2
R
L
= 50 ohms
V
LOUT
= 2.326 V
I
LOUT
= 7.5 mA
Equation 5
Equation 5 should be used to determine the value of R
1
and R
2
for the particular transformer used by each customer.
LOUT2
LOUT1
V
LOUT
+
R
2
R
1
Notes:
1. R
SEC
is the DC impedance of the transformer secondary (IC side of transformer).
2. R
PRIM
is the DC impedance of the transformer primary (line side of transformer).
3. R
CORD
is the DC impedance of the TE connecting cord; typically 4–6 ohms.
4. N is the transformer turns ratio (N = 2 for Am79C30A/32A).
5. R
L
is the S-interface line impedance (50 ohms).
6. I
LOUT
is the desired load current for the CCITT transmission templates (7.5 mA for 50-ohm line).
7. V
LOUT
is the nominal output voltage from the DSC/IDC line driver.
09893H-20
R
SEC
R
PRIM
N
2
R
CORD
N
2
R
L
N
2
I
LOUT
I
LOUT
V
N
R
1
R
2
R
SEC
R
PRIM
(
)
R
L
N
(
)
R
CORD
N
(
)
+
+
+
+
+
--------------------------------------------------------------------------------------------------------------------------------------------------------------
=
R
1
R
2
+
V
I
LOUT
----------------------
)
(
)
R
SEC
R
PRIM
N
2
(
)
R
L
N
2
(
)
R
CORD
N
2
(
)
=
R
1
R
2
+
1
2
--
V
LOUT
-I
R
SEC
R
PRIM
N
2
(
)
R
L
N
2
(
)
R
CORD
N
2
(
)
=
R
1
R
2
55.067
1
SEC
4
R
PRIM
(
)
4
R
CORD
(
)
+
+
{
}
+
=
=
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