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CF8223A 데이터시트(PDF) 13 Page - Nippon Precision Circuits Inc

부품명 CF8223A
상세설명  FSK Decoder and DTMF Receiver IC
PDF  15 Pages
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제조업체  NPC [Nippon Precision Circuits Inc]
홈페이지  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

CF8223A 데이터시트(HTML) 13 Page - Nippon Precision Circuits Inc

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SM8223A
NIPPON PRECISION CIRCUITS—13
The DTMF receiver determines whether the received
data (DTMF signal) is valid after an interval of
tREC ≥ 40ms stable reception. If valid, DV goes
LOW and data is output on DOUT. If DTMF data is
not detected after an interval tSPA ≥ 20ms, a data
pause is activated and the next DTMF signal is in a
wait state (see timing diagrams in AC Electrical
Characteristics). The SM8223A DTMF receiver can
be used as a general-purpose DTMF receiver without
the need for the external time constant circuit, in
which case the resistor/capacitor/diode network can
be omitted.
Figure 5. DTMF signal to DOUT output
S3
S2
S1
Q0
DTMF signal
DOUT
Stop bit
1
0
DTMF DATA
Q1
Q2
Q3
S0
Start bit
DTMF data
(LSB first)
Checksum
(2'mod16)
(LSB first)



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