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參數(shù)資料
| 型號(hào)： | MT8870DE |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | ISO2-CMOS Integrated DTMF Receiver |
| 中文描述： | ISO2 - CMOS集成雙音多頻接收器 |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大小： | 215K |
| 代理商： | MT8870DE |
ISO
2
-CMOS
MT8870D/MT8870D-1
4-21
Figure 11 - Timing Diagram
AA
AA
AA
AA
V
in
ESt
St/GT
Q
1
-Q
4
StD
TOE
EVENTS
A
B
C
D
E
F
G
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
PQ
t
QStD
t
PSrD
t
PTD
t
PTE
# n
# (n + 1)
HIGH IMPEDANCE
DECODED TONE # (n-1)
EXPLANATION OF EVENTS
A)
TONE BURSTS DETECTED, TONE DURATION INVALID, OUTPUTS NOT UPDATED.
B)
TONE #n DETECTED, TONE DURATION VALID, TONE DECODED AND LATCHED IN OUTPUTS
C)
END OF TONE #n DETECTED, TONE ABSENT DURATION VALID, OUTPUTS REMIAN LATCHED UNTIL NEXT VALID
TONE.
D)
OUTPUTS SWITCHED TO HIGH IMPEDANCE STATE.
E)
TONE #n + 1 DETECTED, TONE DURATION VALID, TONE DECODED AND LATCHED IN OUTPUTS (CURRENTLY
HIGH IMPEDANCE).
F)
ACCEPTABLE DROPOUT OF TONE #n + 1, TONE ABSENT DURATION INVALID, OUTPUTS REMAIN LATCHED.
G)
END OF TONE #n + 1 DETECTED, TONE ABSENT DURATION VALID, OUTPUTS REMAIN LATCHED UNTIL NEXT
VALID TONE.
EXPLANATION OF SYMBOLS
V
in
DTMF COMPOSITE INPUT SIGNAL.
ESt
EARLY STEERING OUTPUT. INDICATES DETECTION OF VALID TONE FREQUENCIES.
St/GT
STEERING INPUT/GUARD TIME OUTPUT. DRIVES EXTERNAL RC TIMING CIRCUIT.
Q
1
-Q
4
4-BIT DECODED TONE OUTPUT.
StD
DELAYED STEERING OUTPUT. INDICATES THAT VALID FREQUENCIES HAVE BEEN PRESENT/ABSENT FOR THE
REQUIRED GUARD TIME THUS CONSTITUTING A VALID SIGNAL.
TOE
TONE OUTPUT ENABLE (INPUT). A LOW LEVEL SHIFTS Q
1
-Q
4
TO ITS HIGH IMPEDANCE STATE.
t
REC
MAXIMUM DTMF SIGNAL DURATION NOT DETECED AS VALID
t
REC
MINIMUM DTMF SIGNAL DURATION REQUIRED FOR VALID RECOGNITION
t
ID
MAXIMUM TIME BETWEEN VALID DTMF SIGNALS.
t
DO
MAXIMUM ALLOWABLE DROP OUT DURING VALID DTMF SIGNAL.
t
DP
TIME TO DETECT THE PRESENCE OF VALID DTMF SIGNALS.
t
DA
TIME TO DETECT THE ABSENCE OF VALID DTMF SIGNALS.
t
GTP
GUARD TIME, TONE PRESENT.
t
GTA
GUARD TIME, TONE ABSENT.
V
TSt
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT8870DC-1 | ISO2-CMOS Integrated DTMF Receiver |
| MT8870DE-1 | ISO2-CMOS Integrated DTMF Receiver |
| MT8870DN-1 | ISO2-CMOS Integrated DTMF Receiver |
| MT8870D | Integrated DTMF Receiver(完全雙音多頻信號(hào)（DTMF）接收器（集成了濾波器和數(shù)字譯碼器功能）) |
| MT8870D-1 | Integrated DTMF Receiver(完全雙音多頻信號(hào)（DTMF）接收器（集成了濾波器和數(shù)字譯碼器功能）) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT8870DE1 | 制造商:Microsemi Corporation 功能描述:DTMF RX 3.58MHZ CMOS 5V 18PDIP - Rail/Tube 制造商:Microsemi Corporation 功能描述:Pb Free DTMF RECEIVER DIP 制造商:Zarlink Semiconductor Inc 功能描述:DTMF RX 3.58MHZ CMOS 5V 18PDIP - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:Pb Free DTMF RECEIVER DIP |
| MT8870DE-1 | 制造商:Microsemi Corporation 功能描述:DTMF RX 3.58MHZ CMOS 5V 18PDIP - Rail/Tube 制造商: 功能描述: 制造商:undefined 功能描述: |
| MT8870DE1-1 | 制造商:Microsemi Corporation 功能描述:DTMF RX 3.58MHZ CMOS 5V 18PDIP - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:DTMF RX 3.58MHZ CMOS 5V 18PDIP - Rail/Tube |
| MT8870DN | 制造商:Microsemi Corporation 功能描述: |
| MT8870DN1 | 制造商:Microsemi Corporation 功能描述:DTMF RX 3.58MHZ CMOS 5V 20SSOP - Rail/Tube |
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