SM8223A Datasheet, PDF (8/15 Pages) Nippon Precision Circuits Inc – FSK Decoder and DTMF Receiver IC

DTMF receive timing (1)
SM8223A
tPR
Tip/Ring
DTMF Data #1
#1
tRE
DV
tAF
FSK/DTMF
tBDD
DOUT
Data #1
tDPD
PDWN
tDOSC
OSCOUT
tPA
tRE
DTMF Data #2
Data #2
DTMF receive timing (2)
DV
DOUT
tBDD
0 Q0 Q1 Q2 Q3 S0 S1 S2 S3 1
Start bit ^{DTMF data}
Checksum
(2'mod16)
Stop bit
(FSK/DTMF) DOUT output timing
DOUT
tDf0
tDWL
tDWH
tDr0
90%
10%
NIPPON PRECISION CIRCUITS—8