參數(shù)資料
型號(hào)： MT8888CSR
廠商： ZARLINK SEMICONDUCTOR INC
元件分類(lèi)： 信令電路
英文描述： Integrated DTMF Transceiver with Intel Micro Interface
中文描述： TELECOM, DTMF SIGNALING CIRCUIT, PDSO20
封裝： 0.300 INCH, MS-013AC, SOIC-20
文件頁(yè)數(shù)： 10/25頁(yè)
文件大?。?/td> 536K
代理商： MT8888CSR
MT8888C
Data Sheet
10
Zarlink Semiconductor Inc.
The lookup table contains codes which are used by the switched capacitor D/A converter to obtain discrete and
highly accurate DC voltage levels. Two identical circuits are employed to produce row and column tones, which
are then mixed using a low noise summing amplifier. The oscillator described needs no “start-up” time as in other
DTMF generators since the crystal oscillator is running continuously thus providing a high degree of tone burst
accuracy. A bandwidth limiting filter is incorporated and serves to attenuate distortion products above 8 kHz. It can
be seen from Figure 8 that the distortion products are very low in amplitude.
Figure 10 - Spectrum Plot
8.0 Burst Mode
In certain telephony applications it is required that DTMF signals being generated are of a specific duration
determined either by the particular application or by any one of the exchange transmitter specifications currently
existing. Standard DTMF signal timing can be accomplished by making use of the Burst Mode. The transmitter is
capable of issuing symmetric bursts/pauses of predetermined duration. This burst/pause duration is 51 ms
±
1 ms,
which is a standard interval for autodialer and central office applications. After the burst/pause has been issued, the
appropriate bit is set in the Status Register indicating that the transmitter is ready for more data. The timing
described above is available when DTMF mode has been selected. However, when CP mode (Call Progress mode)
is selected, the burst/pause duration is doubled to 102 ms
±
2 ms. Note that when CP mode and Burst mode have
been selected, DTMF tones may be transmitted only and
not
received. In applications where a non-standard
burst/pause time is desirable, a software timing loop or external timer can be used to provide the timing pulses
when the burst mode is disabled by enabling and disabling the transmitter.
Scaling Information
10 dB/Div
Start Frequency = 0 Hz
Stop Frequency = 3400 Hz
Marker Frequency = 697 Hz and
1209 Hz
相關(guān)PDF資料
PDF描述
MT8888CSR1 Integrated DTMF Transceiver with Intel Micro Interface
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT8888CSR1 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 20SOIC - Tape and Reel
MT8889C 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Integrated DTMF Transceiver with Adaptive Micro Interface
MT8889CC 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated DTMFTransceiver with Adaptive Micro Interface
MT8889CC-1 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated DTMFTransceiver with Adaptive Micro Interface
MT8889CE 制造商:Microsemi Corporation 功能描述:
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