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參數(shù)資料
| 型號： | MT8888CS |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Integrated DTMFTransceiver with Intel Micro Interface |
| 中文描述： | 綜合DTMFTransceiver與英特爾微型接口 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 302K |
| 代理商： | MT8888CS |
MT8888C/MT8888C-1
4-97
Figure 10 - Spectrum Plot
Scaling Information
10 dB/Div
Start Frequency = 0 Hz
Stop Frequency = 3400 Hz
Marker Frequency = 697 Hz and
1209 Hz
Burst Mode
In certain telephony applications it is required that
DTMF signals being generated are of a specific
duration
determined
either by
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.
the particular
Single Tone Generation
A single tone mode is available whereby individual
tones from the low group or high group can be
generated. This mode can be used for DTMF test
equipment
applications,
generation and distortion measurements. Refer to
Control Register B description for details.
acknowledgment
tone
Table 2. Actual Frequencies Versus Standard
Requirements
Distortion Calculations
The MT8888C/MT8888C-1 is capable of producing
precise tone bursts with minimal error in frequency
(see Table 2). The internal summing amplifier is
followed by a first-order lowpass switched capacitor
filter to minimize harmonic components and
intermodulation
products.
distortion for a single tonecan be calculated using
Equation 1, which is the ratio of the total power of all
the extraneous frequencies to the power of the
fundamental frequency expressed as a percentage.
The
total
harmonic
Equation 1. THD (%) For a Single Tone
ACTIVE
INPUT
OUTPUT FREQUENCY (Hz)
%ERROR
SPECIFIED
697
770
852
941
1209
1336
1477
1633
ACTUAL
699.1
766.2
847.4
948.0
1215.9
1331.7
1471.9
1645.0
L1
+0.30
-0.49
-0.54
+0.74
+0.57
-0.32
-0.35
+0.73
L2
L3
L4
H1
H2
H3
H4
THD (%) = 100
V
fundamental
V
22f
+ V
23f
+ V
24f
+ .... V
2nf
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT8888CS1 | 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHz CMOS 5V 20-Pin SOIC Tube 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 20SOIC - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TXRX DTMF 20SOIC 制造商:Microsemi Corporation 功能描述:IC TXRX DTMF 20SOIC |
| MT8888CS-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated DTMFTransceiver with Intel Micro Interface |
| MT8888CSR | 制造商:Microsemi Corporation 功能描述: |
| 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 |
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