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參數(shù)資料
| 型號： | MH88422BD-1 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Data Access Arrangement Preliminary Information |
| 中文描述： | 數(shù)據(jù)訪問安排的初步信息 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大?。?/td> | 73K |
| 代理商： | MH88422BD-1 |
MH88422
Preliminary Information
2-16
the device has an internal cancellation circuit. The
measure of attenuation is Transhybrid Loss (THL).
The Transmit (VX) and Receive (VR) signals are
ground referenced (AGND), and biased to 2.5V. The
device must be in the off-hook condition for
transmission or reception to take place.
Transmit Gain
The Transmit Gain of the MH88422 is the gain from the
differential signal across Tip and Ring to the ground
referenced signal at VX. The internal Transmit Gain of
the device is fixed and depends on the variant as
shown in the AC Electrical Characteristics table. For
the correct gain, the Input Impedance of the MH88422
variant used, must match the specified line
impedance.
By adding an external potential divider to VX, it is
possible to reduce the overall gain in the application.
The output impedance of VX is approximately 10
and
the minimum resistance from VX to ground should be
2k
.
Example: If R1 = R2 = 2k
,
in Figure 3, the gain would
reduce by 6.0dB.
Receive Gain
The Receive Gain of the MH88422 is the gain from the
ground referenced signal at VR to the differential
signal across Tip and Ring. The internal Receive Gain
of the device is fixed as shown in the AC Electrical
Characteristics table. For the correct gain, the Input
Impedance of the MH88422 variant used, must match
the specified line impedance.
The input impedance to ground of VR is 47k
and this
can be used with an external series resistor to form a
potential divider and reduce the overall gain in the
application.
Example: If R3 = 100k
, in Figure 3, the Gain would
reduce by 3.0dB.
Supervisory Features
The device is capable of monitoring the line
conditions across Tip and Ring, this is shown in
Figure 3. The Ringing Voltage Loop Current detect
pin (RVLC), indicates the status of the device. The
RVLC output is at logic 0 when loop current flows,
indicating that the MH88422 is in an off hook state.
When the device is generating dial pulses, the RVLC
pin outputs a TTL pulse at the same rate.
An AC ringing voltage across Tip and Ring will cause
RVLC to output a TTL pulse at double the ringing
frequency with an envelope determined by the
ringing cadence.
Mechanical Data
See Figure 10, for details of the mechanical
specification.
Figure 3 - Typical Application Circuit
TIP
RLS
TF
TXIN
RING
VX
VR
RVLC
LC
AGND
3
VDD
1
TIP
RING
C1
+5V
5
7
11
13
16
18
20
24
26
Audio
Input
Audio
Output
Ring Voltage & Loop
Current Detect Output
Loop Control Input
MH88422
+
R1
R2
R3
Protection
Circuit
C3
C4
C2
Notes:
1) R1, R2: Transmit Gain Resistors
2) R3: Receive Gain Resistor
3) C1: 10
μ
F 6V Tantalum
4) C2: Dummy Ringer Capacitor 250V
5) C3, C4: 10
μ
F AC coupling Capacitors
相關PDF資料 |
PDF描述 |
|---|---|
| MH88422 | Line Interface Circuit Preliminary Information |
| MH88422-1 | Data Access Arrangement Preliminary Information |
| MH88422-2 | Data Access Arrangement Preliminary Information |
| MH88422-3 | Data Access Arrangement Preliminary Information |
| MH88422 | Data Access Arrangement(數(shù)據(jù)存取陣列（在數(shù)據(jù)傳送設備和電話線之間提供一個完全接口）) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MH88434-P | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MH88435 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Data Access Arrangement |
| MH88435AD-P | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Data Access Arrangement |
| MH88435AD-PI | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Data Access Arrangement Preliminary Information |
| MH88435AS-P | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Data Access Arrangement Preliminary Information |
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