cf8224c Nippon Precision Circuits Inc, (NPC), cf8224c Datasheet - Page 8

• Manufacturer Part Number: cf8224c
• Description: Dual-tone Receiver Ic
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

TIMING DIAGRAMS
FSK demodulator timing
PDWN is an internal signal (set by S0, S1, MODE)
Output timing
DOUT
STR
Data timing
OSCOUT
TIP/RING
PDWN
STR
DOUT
CDET
DOUT
L1/L2
DOUT
b4 b5 b6 b7
b6 b7 1
1st Ring
STOP
t
IDD
t
f0
t
START
0 b0 b1 b2 b3 b4 b5 b6 b7 1
r0
t
DOSC
b0 b1 b2 b3 b4 b5 b6 b7
101010...
SM8224C
t
DAQ
101010...1
1
STOP
Data
Data
t
r0
START
t
f0
0 b0 b1 b2 b3 b4
STOP
START
90%
10%
SEIKO NPC CORPORATION —8
90%
10%
t
DCH
b0 b1 b2 b3 b4
2nd Ring
b5 b6