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MT8870DE1-1 参数 Datasheet PDF下载

MT8870DE1-1图片预览
型号: MT8870DE1-1
PDF下载: 下载PDF文件 查看货源
内容描述: [DTMF Signaling Circuit, CMOS, PDIP18, LEAD FREE, PLASTIC, MS-001AC, DIP-18]
分类和应用: 光电二极管
文件页数/大小: 19 页 / 424 K
品牌: ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
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MT8870D/MT8870D-1  
Data Sheet  
D
A
B
C
E
F
G
EVENTS  
tREC  
tDO  
tID  
tREC  
TONE  
#n + 1  
TONE  
#n + 1  
TONE #n  
Vin  
tDP  
tDA  
ESt  
tGTA  
tGTP  
VTSt  
St/GT  
tPQ  
tQStD  
HIGH IMPEDANCE  
Q1-Q4  
# n  
# (n + 1)  
DECODED TONE # (n-1)  
tPSrD  
StD  
tPTE  
tPTD  
TOE  
EXPLANATION OF EVENTS  
A)  
B)  
C)  
TONE BURSTS DETECTED, TONE DURATION INVALID, OUTPUTS NOT UPDATED.  
TONE #n DETECTED, TONE DURATION VALID, TONE DECODED AND LATCHED IN OUTPUTS  
END OF TONE #n DETECTED, TONE ABSENT DURATION VALID, OUTPUTS REMIAN LATCHED UNTIL NEXT VALID  
TONE.  
D)  
E)  
OUTPUTS SWITCHED TO HIGH IMPEDANCE STATE.  
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  
Vin  
DTMF COMPOSITE INPUT SIGNAL.  
ESt  
EARLY STEERING OUTPUT. INDICATES DETECTION OF VALID TONE FREQUENCIES.  
STEERING INPUT/GUARD TIME OUTPUT. DRIVES EXTERNAL RC TIMING CIRCUIT.  
4-BIT DECODED TONE OUTPUT.  
DELAYED STEERING OUTPUT. INDICATES THAT VALID FREQUENCIES HAVE BEEN PRESENT/ABSENT FOR THE  
REQUIRED GUARD TIME THUS CONSTITUTING A VALID SIGNAL.  
St/GT  
Q1-Q4  
StD  
TOE  
tREC  
tREC  
tID  
TONE OUTPUT ENABLE (INPUT). A LOW LEVEL SHIFTS Q1-Q4 TO ITS HIGH IMPEDANCE STATE.  
MAXIMUM DTMF SIGNAL DURATION NOT DETECED AS VALID  
MINIMUM DTMF SIGNAL DURATION REQUIRED FOR VALID RECOGNITION  
MAXIMUM TIME BETWEEN VALID DTMF SIGNALS.  
tDO  
tDP  
tDA  
tGTP  
tGTA  
MAXIMUM ALLOWABLE DROP OUT DURING VALID DTMF SIGNAL.  
TIME TO DETECT THE PRESENCE OF VALID DTMF SIGNALS.  
TIME TO DETECT THE ABSENCE OF VALID DTMF SIGNALS.  
GUARD TIME, TONE PRESENT.  
GUARD TIME, TONE ABSENT.  
Figure 11 - Timing Diagram  
16  
Zarlink Semiconductor Inc.