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參數資料
| 型號： | L8576B |
| 英文描述： | Dual Ringing SLIC |
| 中文描述： | 雙振鈴用戶接口 |
| 文件頁數： | 20/26頁 |
| 文件大小： | 583K |
| 代理商： | L8576B |
20
Agere Systems Inc.
Data Sheet
May 2001
L8576B Dual Ringing SLIC
Applications
(continued)
ac Design
(continued)
Example 1, Real Termination
The following design equations refer to the circuit in
Figure 20. Use these to synthesize real termination
impedance.
Termination impedance:
Receive gain:
Transmit gain:
Hybrid balance:
To optimize the hybrid balance, the sum of the currents
at the VF
X
IN input of the codec op amp should be set
to 0. The following expressions assume the hybrid bal-
ance network is the same as the termination imped-
ance:
Z
t
I
T/R
–
----------
=
Z
t
2R
P
R
GP
1
--------
R
RCV
-----------
+
+
----------------------------------
+
=
G
RCV
V
FRO
-----------
=
G
RCV
1
R
T1
-----------
R
GP
-----------
+
+
1
t
Z
T/R
--------
+
------------------------------------------------------------------
=
G
TX
V
T/R
--------------
=
G
TX
X
T2
----------
T/R
-----------
×
=
h
bal
20
V
T/R
-----------
log
=
R
HB
G
RCV
G
TX
×
--------------------------
=
h
bal
20
R
HB
--------
G
RCV
G
TX
×
–
log
=
12-2554.o (F)
Figure 20. ac Equivalent Circuit Using a T8503 Codec
R
P
Z
T
+
–
R
P
V
T/R
I
T/R
V
S
Z
T/R
+
–
PR
A
V
= –1
A
V
= 1
VITR
–
+
+
–
CURRENT
SENSE
PT
TG
R
GX
+
–
R
T1
R
RCV
R
HB
R
T2
RCVN
RCVP
RX
GSX
VF
X
IN
VF
R
O
1/2 T8503 CODEC
R
GP
+2.4 V
125 V/A
1/2 L8576
SLIC
AX
A
V
= 6
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