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參數(shù)資料
| 型號(hào)： | MH88435-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(gè)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(gè)完全接口）） |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 71K |
| 代理商： | MH88435-P |
MH88435-P
Preliminary Information
2-42
Input Impedance
The MH88435 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 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:
Zext = 900
+
(8k2
//12nF)
Where the input impedance (Z) = 600R the equation
can be simplified to:
Zext = (10 x Z) - 1k3
Zext = 4k7
Note: A table of commonly used impedances can be
found in the DAA Application’s document MSAN-154.
Zext = external network connected between ZA and
AGND, Zint = 1.3k
(internal resistance).
Network Balance
The network balance impedance of the device can
be programmed by adding external components
between NB1 and NB2. For countries where the
balance impedance matches the line impedance, a
15k
resistor should be added between NB1 and
NB2.
Ringing Voltage Detection
The sensitivity of the ringing voltage detection
circuitry can be adjusted by applying an external
resistor between the RS and LOOP pins. With a
short circuit, the threshold sensitivity is ~10Vrms R7
can be calculated using the equation:
R1
R2
C1
ZA
Iloop=26mA
Iloop=20mA
Iloop=15mA
10
5
0
25
20
15
30
R2(kOhms)
200 600 1000 1400 1800 2200 2600 3000 3400 3800
Figure 3 - DC Programming Capabilities
(V(t-r)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MH88435 | Data Access Arrangement |
| MH88435AD-P | Data Access Arrangement Preliminary Information |
| MH88435-P | Data Access Arrangement Preliminary Information |
| MH88435AD-PI | Data Access Arrangement Preliminary Information |
| MH88435AS-P | Data Access Arrangement Preliminary Information |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MH88437 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Data Access Arrangement Advance Information |
| MH88437AD-P | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Data Access Arrangement Advance Information |
| MH88437AD-PI | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Data Access Arrangement Advance Information |
| MH88437AS-P | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Data Access Arrangement Advance Information |
| MH88437AS-PI | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Data Access Arrangement Advance Information |
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