參數(shù)資料
型號(hào)： LUCL8575BP-TR
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(yè)數(shù)： 31/36頁(yè)
文件大小： 633K
代理商： LUCL8575BP-TR
Advance Data Sheet
March 1997
L8575
Dual-Resistive, Low-Cost SLIC
Lucent Technologies Inc.
31
ac Design
(continued)
Design Equations
(continued)
The Tip/Ring differential current is given by:
The voltage at pin XMT is given by:
The component values in the ac interface of Figure 13
are calculated (for the transmit and receive gains
defined by the respective gain constants K
RX
and K
RCV
,
and for the termination impedance seen in Figure 12)
using the following equations:
600
= 2 x 300
feed resistors
R
GX
= 2 x K
TX
(R
GX1
+ R
T1
)
100
R
T1
2
′
C
′
R
=
The 300
feed resistors contribute 600
to the termi-
nation impedance. The termination impedance associ-
ated with the circuit in Figure 13 consists of this
inherent 600
feeding impedance in parallel with:
I
A negative impedance, where,
x
I
A positive impedance, where,
x
The negative and positive impedance terms are used
to adjust the termination impedance from the inherent
600
to any complex termination.
Note in the case of a pure 600
dc termination, the
two 300
feed resistors provide this termination, and
components R
T1
, R
T2
, and C
T
are not used in the ac
interface circuit.
Using the circuit of Figure 13, the ratio of capacitors C
T
and C
R
will affect the (transmit and receive) gain flat-
ness, and to a lesser degree the return loss of the line
circuit. Thus, depending on the requirements, C
T
and
C
R
may need to be tight tolerance capacitors.
If this is the case, capacitors C
T
and C
R
may be com-
bined into a single capacitor with a looser tolerance.
This is illustrated in Figure 14.
I
T/R
200 I
RP
RN
Z
IRP
V
–
=
V
XMT
T/R
2
--V
=
R
RV1
1
′
K
RCV
2
′
K
RCV
RCV
C
′
100
100R
=
R
RV2
100R
=
C
R
K
=
R
GX1
R
T1
+
R
R
100
1
600
R
1
′
---1
–
=
C
T
--------- 1
GX1
R
1
′
R
RV1
100R
+
+
=
R
T2
C
T
100
--2
GX1
R
GX1
R
T1
+
--------R
R
T2
ω
C
T
j
+
GX1
R
R
T1
+
R
T1
12-3426a(F)
Figure 14. Revised ac Interface C
T
and C
R
Combined into a Single Capacitor C
S
XMT
RT2
C
T
IRP
C
R
V
FRO
RRV2
XMT
RT2
IRP
C
S
= C
T
+ C
R
V
FRO
RRV2
RRV1
RRV1
—
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