參數(shù)資料
型號(hào)： L8560
廠商： Lineage Power
英文描述： Low-Power SLIC（electronic subscriber loop interface circuits ） with Ringing(帶振鈴的低功耗用戶線接口（SLIC）)
中文描述： 低功耗用戶接口（電子用戶環(huán)路接口電路）與振鈴（帶振鈴的低功耗用戶線接口電路（SLIC））
文件頁(yè)數(shù)： 43/46頁(yè)
文件大?。?/td> 1060K
代理商： L8560
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
相關(guān)PDF資料
PDF描述
L8567 SLIC for People Republic of China Applications(用于中國(guó)的用戶線接口（SLIC）)
L8574D Resistive Subscriber Line Interface Circuit (SLIC), Ring Relay, and Protector (SRP) for Long Loop and TR-57 Applications(長(zhǎng)環(huán)路和TR-57應(yīng)用的電阻性用戶線接口，振鈴繼電器和保護(hù)器)
L8575 Dual-Resistive, Low-Cost Subscriber Line Interface Circuit (SLIC)(雙電阻、低價(jià)格用戶線接口)
L8576B Dual Ringing SLIC(雙通道振鈴用戶環(huán)路接口（SLIC）)
L8581 Line Test,Tip/Ring, Line Card Access Switches(線測(cè)試，振鈴，線卡存取開(kāi)關(guān))
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