SM8223A
FSK Decoder and DTMF Receiver IC
NIPPON PRECISION CIRCUITS INC.
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 operation. 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 function1
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
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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 frequency
Molybdenum-gate CMOS process
(Top view)
TIP
1
RING
GS
AGND
RDIN
RDRC
RDET
PDWN
16
SM8223AP
s
PINOUT
VDD
DV
DOUT
FSK/DTMF
IC
OSCIN
OSCOUT
9
8
GND
APPLICATIONS
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Telephones, fax machines and modems that support caller-ID information services
Adapters for caller-ID information service functions
Telephones, fax machines and modems that support remote operation functions
ORDERING INFORMATION
PINOUT
(Unit: µm)
RING
TIP
VDD
DV
GS
D e vice
16-pin DIP
CF8223A
Chip
DOUT
P ackag e
SM8223A
(2810, 3160)
AGND
FSK/DTMF
RDIN
IC
RDRC
OSCIN
(0, 0)
RDET
PDWN
GND OSCOUT
P ad size : 90 µm × 90 µm
1. Auto-select function operates if the FSK signal conforms to the Bellcore GR-30-CORE standard.
NIPPON PRECISION CIRCUITS—1
