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參數(shù)資料
| 型號： | MH88437-P |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Data Access Arrangement(數(shù)據(jù)存取陣列（在音頻或數(shù)據(jù)傳送設(shè)備和電話線之間提供一個完全接口）) |
| 中文描述： | 數(shù)據(jù)訪問安排（數(shù)據(jù)存取陣列（在音頻或數(shù)據(jù)傳送設(shè)備和電話線之間提供一個完全接口）） |
| 文件頁數(shù)： | 4/16頁 |
| 文件大小： | 96K |
| 代理商： | MH88437-P |
MH88437-P
Advance Information
4
applying a logic 0 to Pin 17, CL, the loop current will
be limited to below 60mA as required in France and
the European TBR21 specification. For all other
countries where current limiting is not required, CL
should be set to 1.
The AC input impedance should be set by the user to
match the line impedance.
Input Impedance
The MH88437 has a programmable input impedance
set by fitting external components between the ZA
pin and AGND.
For complex impedances the configuration shown in
Figure 4 (below) is most commonly found.
Figure 4 - Complex Impedances
To find the external programming components for
configuration 4, the following formula should be
used:
Zext = [(10 x R1)-1k3]+[(10 x R2)//(C1/10)]
e.g. If the required input impedance = 220
+ (820
/
/115nF), the external network to be connected to ZA
will be:
ZA = 900
+
(8k2
//12nF)
Where the input impedance (Z) = 600R the equation
can be simplified to:
ZA = (10 x Z) - 1k3
ZA = 4k7
Note: A table of commonly used impedances can be
found in the DAA Application’s document MSAN-154.
Where Zext = external network connected between
ZA and AGND and Zint = 1.3k
(internal resistance)
between NB1 and NB2. For countries where the
balance impedance matches the line impedance, a
16k
resistor should be added between NB1 and
NB2.
R1
R2
C1
Figure 3 - DC Programming Capability
Iloop=15mA
Iloop=20mA
Iloop=26mA
35
30
10
5
0
25
20
15
40
50
150 250 350 450 550 650 750 850 950
R2(kOhms)
V(t-r)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MH88437 | Data Access Arrangement Advance Information |
| MH88437AS-PI | Data Access Arrangement Advance Information |
| MH88437AS-P | Data Access Arrangement Advance Information |
| MH88437-P | Data Access Arrangement Advance Information |
| MH88437AD-P | Data Access Arrangement Advance Information |
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|---|---|
| MH88500 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Hybrid Subscriber Line Interface Circuit (SLIC) Preliminary Information |
| MH88500IN | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Hybrid Subscriber Line Interface Circuit (SLIC) Preliminary Information |
| MH88510 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Subscriber Line Interface Circuit (SLIC) Preliminary Information |
| MH88511 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Subscriber Line Interface Circuit (SLIC) Preliminary Information |
| MH88520-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:German Subscriber Line Interface Circuit (SLIC) Preliminary Information |
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