SM8223A Datasheet, PDF (7/15 Pages) Nippon Precision Circuits Inc – FSK Decoder and DTMF Receiver IC

SM8223A
OSCIN input timing (when external input)
tWL
tWH
VDD
OSCIN
VSS
tf
tr
FSK receive timing (1)
Tip/Ring
1st Ring
Ch. seizure Mark Data packet
1010101... 111... Data
2nd Ring
RDET
DV
FSK/DTMF
DOUT
PDWN
OSCOUT
tDED
tAF
tDPD
tDOSC
tHF
tADD
Data
Data output has
no Ch.seizure signal.
FSK receive timing (2)
Start bit LSB
MSB Stop bit
Tip/Ring
b6 b7 1 0 b0 b1 b2 b3 b4 b5 b6 b7 1 0 b0 b1
tADD
DOUT b4 b5 b6 b7 1 0 b0 b1 b2 b3 b4 b5 b6 b7 1 0 b0 b1
NIPPON PRECISION CIRCUITS—7