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參數(shù)資料
| 型號： | L8560 |
| 英文描述： | Low-Power SLIC with Ringing |
| 中文描述： | 低功耗振鈴用戶接口 |
| 文件頁數(shù)： | 43/46頁 |
| 文件大?。?/td> | 842K |
| 代理商： | L8560 |
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Lucent Technologies Inc.
43
Data Sheet
April 2000
L8560 Low-Power SLIC with Ringing
Applications
(continued)
Design Examples
(continued)
Blocking Capacitors
5-6401b(F)
Figure 40. ac Interface Using First-Generation Codec (Including Blocking Capacitors) for Complex
Termination Impedance
If a 5 V only codec such as the Lucent T7504 is used, dc blocking capacitors must be added as shown in Figure
40. This is because the codec is referenced to 2.5 V and the SLIC to ground—with the ac coupling, a dc bias at
T/R is eliminated and power associated with this bias is not consumed.
Typically, values of 0.1 μF to 0.47 μF capacitors are used for dc blocking. The addition of blocking capacitors will
cause a shift in the return loss and hybrid balance frequency response toward higher frequencies, degrading the
lower-frequency response. The lower the value of the blocking capacitor, the more pronounced the effect is, but
the cost of the capacitor is lower. It may be necessary to scale resistor values higher to compensate for the
low-frequency response. This effect is best evaluated via simulation. A
PSPICE
* model for the L8560 is available.
Design equation calculations seldom yield standard component values. Conversion from the calculated value to
standard value may have an effect on the ac parameters. This effect should be evaluated and optimized via simu-
lation.
* PSPICEis a registered trademark of MicroSim Corporation.
0.1
μ
F
R
TGS
V
TX
R
TGP
= 4.32 k
T
XI
V
ITR
R
T6
R
x
R
T3
R
HB
CODEC
OUTPUT
DRIVE
AMP
CODEC
OP AMP
–
+
19.2
C
N
R
N1
R
N2
R
GP
R
RCV
RCVN
RCVP
–I
T/R
207.36
C
GS
C
B1
2.5 V
C
B2
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