SM8223A Datasheet, PDF (1/15 Pages) Nippon Precision Circuits Inc – FSK Decoder and DTMF Receiver IC

NIPPON PRECISION CIRCUITS INC.
SM8223A
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 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
s Both FSK signal caller-ID information services
and DTMF signal caller-ID information services
supported
s FSK decoder/DTMF receiver auto-select function
s Ring (call signal) signal detection circuit built-in
s Serial I/O
s Input gain adjustment circuit built-in
s Power-down mode
s Single supply operation: 3.0V ± 10%
s 3.579545MHz external crystal oscillator fre-
quency
s Molybdenum-gate CMOS process
APPLICATIONS
s Telephones, fax machines and modems that sup-
port caller-ID information services
s Adapters for caller-ID information service func-
tions
s Telephones, fax machines and modems that sup-
port remote operation functions
ORDERING INFORMATION
Device
SM8223A
CF8223A
Package
16-pin DIP
Chip
PINOUT
(Top view)
TIP 1
RING
GS
AGND
RDIN
RDRC
RDET
PDWN 8
PINOUT
(Unit: µm)
RING TIP
GS
AGND
RDIN
16 VDD
DV
DOUT
FSK/DTMF
IC
OSCIN
OSCOUT
9 GND
VDD
DV
(2810, 3160)
DOUT
FSK/DTMF
IC
RDRC
OSCIN
(0, 0)
RDET PDWN
GND OSCOUT
P ad size : 90µm × 90µm
1. Auto-select function operates if the FSK signal conforms to the Bellcore GR-30-CORE standard.
NIPPON PRECISION CIRCUITS—1