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參數(shù)資料
| 型號： | MT8880C |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Integrated DTMF Transceiver(雙音多頻信號（DTMF）收發(fā)器（帶電話程序濾波器）) |
| 中文描述： | 集成雙音多頻收發(fā)器（雙音多頻信號（DTMF）的收發(fā)器（帶電話程序濾波器）） |
| 文件頁數(shù)： | 6/24頁 |
| 文件大小： | 188K |
| 代理商： | MT8880C |
MT8880C
ISO
2
-CMOS
4-38
Figure 9 - Receiver Timing Diagram
V
in
ESt
St/GT
RX
0
-RX
3
b3
b2
Read
Status
Register
IRQ/CP
EVENTS
A
B
C
D
E
F
t
REC
t
REC
t
ID
t
DO
TONE #n
TONE
#n + 1
TONE
#n + 1
t
DP
t
DA
t
GTP
t
GTA
t
PStRX
t
PStb3
DECODED TONE # (n-1)
# n
# (n + 1)
V
TSt
of time segments is fixed at 32, however, by varying
the segment length as described above the tone
output signal frequency will be varied. The divider
output clocks another counter which addresses the
sinewave lookup ROM.
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 10
that the distortion products are very low in amplitude.
Figure 10 - Spectrum Plot
Scaling Information
10 dB/Div
Start Frequency = 0 Hz
Stop Frequency = 3400 Hz
Marker Frequency = 697 Hz and
1209 Hz
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PDF描述 |
|---|---|
| MT8885AE | Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface |
| MT8885AN | Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface |
| MT8885AP | Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface |
| MT8885 | Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface |
| MT8885 | Integrated DTMF Transceiver with Power Down and Adaptive Micro Interface(雙音多頻信號（DTMF）收發(fā)器（帶電源關閉和自適應微接口）) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MT8880CC | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS Integrated DTMFTransceiver |
| MT8880CC/CC-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated DTMFTransceiver |
| MT8880CC-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS Integrated DTMFTransceiver |
| MT8880CE | 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 20PDIP - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 20PDIP - Rail/Tube 制造商:Zarlink Semiconductor 功能描述:Bulk |
| MT8880CE/CE-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated DTMFTransceiver |
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