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零件编号
产品描述 (功能)
SM8223A 查看數據表(PDF) - Nippon Precision Circuits
零件编号
产品描述 (功能)
生产厂家
SM8223A
FSK Decoder and DTMF Receiver IC
Nippon Precision Circuits
SM8223A Datasheet PDF : 15 Pages
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DTMF receive timing (1)
SM8223A
t
PR
Tip/Ring
DTMF Data #1
#1
t
RE
DV
t
AF
FSK/DTMF
t
BDD
DOUT
Data #1
t
DPD
PDWN
t
DOSC
OSCOUT
t
PA
t
RE
DTMF Data #2
Data #2
DTMF receive timing (2)
DV
DOUT
t
BDD
0
Q
0
Q
1
Q
2
Q
3
S
0
S
1
S
2
S
3
1
Start bit
DTMF data
Checksum
(2'mod16)
Stop bit
(FSK/DTMF) DOUT output timing
DOUT
t
Df0
t
DWL
t
DWH
t
Dr0
90%
10%
NIPPON PRECISION CIRCUITS—8
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