SM8223A 데이터 시트보기 (PDF) - Nippon Precision Circuits

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SM8223A

FSK Decoder and DTMF Receiver IC

Nippon Precision Circuits  

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

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