cf8223a Nippon Precision Circuits Inc, (NPC), cf8223a Datasheet - Page 7

• Manufacturer Part Number: cf8223a
• Description: Fsk Decoder And Dtmf Receiver Ic
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

DTMF receive timing (1)
DTMF receive timing (2)
(FSK/DTMF) DOUT output timing
FSK/DTMF
OSCOUT
Tip/Ring
PDWN
DOUT
DV
DOUT
t
RE
DOUT
DV
t
DOSC
t
DTMF Data #1
DPD
t
t
AF
Data #1
Df0
t
BDD
Start bit
t
DWL
t
0
t
PR
BDD
CF8223A
Q
0
DTMF data
#1
Q
1
Q
t
2
Df0
Q
t
DWH
3
S
0
Checksum
(2'mod16)
t
PA
S
1
S
NIPPON PRECISION CIRCUITS INC.—7
2
S
3
Stop bit
1
t
V
0.9V
0.5V
0.1V
GND
RE
DD
DD
DD
DD
DTMF Data #2
Data #2