cf8224c Nippon Precision Circuits Inc, (NPC), cf8224c Datasheet - Page 3
cf8224c
Manufacturer Part Number
cf8224c
Description
Dual-tone Receiver Ic
Manufacturer
Nippon Precision Circuits Inc, (NPC)
Datasheet
1.CF8224C.pdf
(11 pages)
BLOCK DIAGRAM
AGND
RING
TRQ
DTQ
DT1
DT2
TIP
OSCIN OSCOUT
Oscillator
Crystal
Circuit
Circuit
Bias
Filter
MODE
Power-down
Circuit
(2130Hz)
(2750Hz)
S1 S0
Filter
Filter
Filter
SM8224C
Demodulator
Detector
Carrier
FSK
(2130Hz)
(2750Hz)
Detector
Detector
Detector
Detector
Circuit
Circuit
Level
Level
Time-constant
SEIKO NPC CORPORATION —3
Output
Circuit
Circuit
VDD
GND
DOUT
CDET
STR
CR
DTDET
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