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MT91634AQ

更新时间： 2024-02-17 00:36:21
品牌 Logo 应用领域
美高森美 - MICROSEMI 电信光电二极管电信集成电路
页数 文件大小 规格书
17页 126K
描述
Telecom IC, PDSO36,

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MT91634AQ 技术参数

是否Rohs认证： 不符合生命周期：Active
零件包装代码：SOIC针数：36
Reach Compliance Code：unknown风险等级：5.78
JESD-30 代码：R-PDSO-G36端子数量：36
最高工作温度：85 °C最低工作温度：-40 °C
封装主体材料：PLASTIC/EPOXY封装代码：SSOP
封装等效代码：SOP36,.4,32封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, SHRINK PITCH电源：5 V
认证状态：Not Qualified子类别：Other Telecom ICs
标称供电电压：5 V表面贴装：YES
温度等级：INDUSTRIAL端子形式：GULL WING
端子节距：0.8 mm端子位置：DUAL
Base Number Matches：1

MT91634AQ 数据手册

 浏览型号MT91634AQ的Datasheet PDF文件第3页浏览型号MT91634AQ的Datasheet PDF文件第4页浏览型号MT91634AQ的Datasheet PDF文件第5页浏览型号MT91634AQ的Datasheet PDF文件第7页浏览型号MT91634AQ的Datasheet PDF文件第8页浏览型号MT91634AQ的Datasheet PDF文件第9页 
MT91633/4  
Preliminary Information  
Ringing Voltage Detection  
Figure 5 (b) - DC Mask  
The sensitivity of the ringing voltage detection  
circuitry can be set to the internal default value of  
16Vrms by setting RSEN to logic 0. If a user-  
programmable voltage is required, RSEN is set to  
logic 1, and a voltage is applied to the RS pin. The  
relationship between the detection threshold voltage  
applied to the RS pin and the actual ringing  
amplitude detected is shown below:  
60  
50  
FRANCE  
TBR021  
TBR021  
40  
50,40  
FRANCE  
30  
20  
42,14.5  
0.03 × f × Vtrp  
Vth = 1 +  
10  
-------------------------------------------------------------------------------  
2
–6  
20,9  
20  
16.8.6  
(592×10 × f ) + (0.63 × f) + 1  
FRANCE  
40  
30  
TIP/RING Current (mA)  
10  
50  
60  
0
Where  
Vth =  
f =  
detection threshold (at RS)  
ringing frequency  
Figure 5 (c) - DC Mask  
Vtrp =  
peak ringing voltage  
The third condition is shown in Figure 5 (c) and  
requires current limiting. It is more commonly known  
as French current limiting but has since been  
adopted by the TBR021 specification. The French  
current limit can be applied by linking VL1 to Vneg  
on the MT91633 and applying a DC voltage (referred  
to Vneg) of 5V. Note that R7 and Z2 (Figure 6) are  
only fitted if French current limiting is required.  
A potential divider consisting of two resistors from  
Vdd to 0V can be used to generate Vth at RS.  
An AC ringing voltage across Tip and Ring will cause  
RV to output TTL pulses at the ringing frequency.  
Dummy Ringer  
The curves have been taken from ETSI  
specifications for Europe, TBR021, and the relevant  
specifications relating to individual countries, and  
were correct at time of going to press. It is advisable  
to confirm your DC mask requirements before  
designing the product into a system.  
A dummy ringer circuit can be connected across Tip  
and Ring, which is an AC load representing a  
telephone s mechanical ringer.  
In normal circumstances, when a telephone is on-  
hook and connected to the PSTN, its AC (Ringer)  
load is permanently presented to the network. This  
condition is used by many PTTs to test line continuity  
by forcing a small AC current onto the line and  
measuring the voltage across Tip and Ring.  
Input Impedance  
The input impedance to match a particular country is  
set by fitting external components to the MT91633.  
These components are the same values as the  
required output impedance e.g. for a 600Ω input  
impedance, fit a 600Ω resistor between VPOS and  
VIR. Alternatively, a programmable CODEC can be  
used to modify the input impedance from 600Ω. It  
should be noted that a different resistor network  
(MH80632) is required for a design with a different  
input impedance to 600Ω. See application notes for  
further information.  
Today s telecom equipment may not have an AC load  
present across Tip and Ring (e.g. modems);  
therefore, any testing carried out by the PTT will see  
an open circuit across Tip and Ring. In this instance  
the PTT assumes that the line continuity has been  
damaged.  
To overcome this problem many PTTs specify that a  
Dummy Ringer is presented to the network at all  
times. The dummy ringer can be configured such  
that it has no effect during off-hook operation. The  
requirement for the Dummy Ringer is country  
specific.  
Network Balance  
The network balance impedance of the device is set  
to be the same as the output impedance.  
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