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參數(shù)資料
| 型號： | MT8870 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 2/23頁 |
| 文件大?。?/td> | 177K |
| 代理商： | MT8870 |
MSAN-108
Application Note
A-46
Figure 1b - The Dual Tone Multifrequency (DTMF) Keypad
Figure 2 - Typical DTMF Receiver Applications
LOW GROUP
TONES
LEGEND :
H1 =
1209
Hz
H2 =
1336
Hz
H3 =
1477
Hz
H4 =
1633
Hz
HIGH GROUP TONES
L1 = 697 Hz
L2 = 770 Hz
L3 = 852 Hz
L4 = 941 Hz
DTMF signal not available on a standard
pushbutton telephone keypad
1
4
7
*
2
5
8
0
3
6
9
#
A
B
C
D
Telephone DTMF keypad matrix. Column H
4
is normally not available on a telephone keypad and is
reserved for special signalling.
LOOP CURRENT
DETECT CIRCUIT
DISCONNECT
RELAY
MT8870
DTMF
RECEIVER
DECODE
LOGIC
CIRCUIT
RELAY
DRIVER
RINGING
DETECTOR
RESET
LOGIC
DISABLE
LOGIC
TO TELEPHONE
EXCHANGE
RECTIFIER
FILTER
& REGULATOR
V
DD
a)
Block diagram of a toll call restrictor. This could be implemented on a small pc board and installed
in a telephone to disallow long distance calling.
LINE INTERFACE
LINE SPLIT RELAY
LINE INTERFACE
CONTROL
LOGIC
MT8870
DTMF
RECEIVER
MT4325
PULSE
DIALER
CENTRAL TELEPHONE SWITCHING OFFICE
TO
STEP-BY-STEP
EXCHANGE
b)
Block diagram of a simple tome to pulse converter to allow TOUCH-TONE dialing into a step-by-
step or crossbar exchange.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT8880C | ISO2-CMOS Integrated DTMFTransceiver |
| MT8880CE-1 | ISO2-CMOS Integrated DTMFTransceiver |
| MT8880CC | ISO2-CMOS Integrated DTMFTransceiver |
| MT8880CE | ISO2-CMOS Integrated DTMFTransceiver |
| MT8880CN | ISO2-CMOS Integrated DTMFTransceiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT8870BE | 制造商:Panasonic Industrial Company 功能描述:RECEIVER |
| MT8870D | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS Integrated DTMF Receiver |
| MT8870DC | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS Integrated DTMF Receiver |
| MT8870DC-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS Integrated DTMF Receiver |
| MT8870DE | 制造商:Microsemi Corporation 功能描述: |
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