參數(shù)資料
型號(hào)： MT8880CS-1
廠商： Mitel Networks Corporation
英文描述： ISO2-CMOS Integrated DTMFTransceiver
中文描述： ISO2 - CMOS集成DTMFTransceiver
文件頁數(shù)： 6/18頁
文件大?。?/td> 312K
代理商： MT8880CS-1
MT8880C/MT8880C-1
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
相關(guān)PDF資料
PDF描述
MT8880C Integrated DTMF Transceiver(雙音多頻信號(hào)（DTMF）收發(fā)器（帶電話程序?yàn)V波器）)
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
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT8880CSR1 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 20SOIC - Tape and Reel 制造商:Microsemi Corporation 功能描述:PB FREE INTEGRATED DTMF TRANSCEIVER
MT8885 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface
MT8885AE 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface
MT8885AE1 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 24PDIP - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TXRX DTMF 20PDIP 制造商:Microsemi Corporation 功能描述:IC TXRX DTMF 20PDIP
MT8885AN 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 24SSOP - Rail/Tube
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