SM8223A
NIPPON PRECISION CIRCUITS INC.
FSK Decoder and DTMF Receiver IC
OVERVIEW
The SM8223A is a FSK (Frequency shift keying) decoder and DTMF (Dual tone multi-frequency) receiver IC.
It is fabricated using a CMOS process and features a power-down function for low power dissipation opera-
tion. The FSK decoder and DTMF receiver have the same performance characteristics as dedicated ICs that
perform the same functions, with the added benefit of an FSK decoder/DTMF receiver auto-select function
1
using the telephone tip/ring input signal. It also features a ring (call signal) signal detection circuit, making for
easy construction of low power dissipation, high-performance analog telephone-related applications.
FEATURES
s
PINOUT
(Top view)
s
s
s
s
s
s
s
s
Both FSK signal caller-ID information services
and DTMF signal caller-ID information services
supported
FSK decoder/DTMF receiver auto-select function
Ring (call signal) signal detection circuit built-in
Serial I/O
Input gain adjustment circuit built-in
Power-down mode
Single supply operation: 3.0V ± 10%
3.579545MHz external crystal oscillator fre-
quency
Molybdenum-gate CMOS process
TIP
RING
GS
AGND
RDIN
RDRC
RDET
PDWN
1
16
VDD
DV
DOUT
FSK/DTMF
IC
OSCIN
OSCOUT
SM8223AP
8
9
GND
APPLICATIONS
s
s
s
Telephones, fax machines and modems that sup-
port caller-ID information services
Adapters for caller-ID information service func-
tions
Telephones, fax machines and modems that sup-
port remote operation functions
PINOUT
(Unit:
µ
m)
RING
TIP
VDD
DV
(2810, 3160)
ORDERING INFORMATION
D e vice
SM8223A
CF8223A
P ackag e
16-pin DIP
Chip
GS
DOUT
AGND
FSK/DTMF
RDIN
IC
RDRC
OSCIN
(0, 0)
RDET
PDWN
GND OSCOUT
P ad size : 90
µ
m
×
90
µ
m
1. Auto-select function operates if the FSK signal conforms to the Bellcore GR-30-CORE standard.
NIPPON PRECISION CIRCUITS—1
NPC [ NIPPON PRECISION CIRCUITS INC ]
