SM8224B
NIPPON PRECISION CIRCUITS INC.
Dual-Tone Receiver IC
OVERVIEW
The SM8224B is a receiver and decoder that supports the Bellcore TR-NWT-000030 and SR-TSV-002476
standards calling number identification (caller ID) and call waiting dual-tone signals. It has separate caller ID
signal and call waiting signal inputs, which allows the gain for each input to be adjusted independently. It is
fabricated in CMOS and features a power-down function, realizing low power dissipation operation.
FEATURES
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PINOUT
(Top view)
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TR-NWT-000030 and SR-TSV-002476 standards
(Bellcore)
Call waiting
FSK decoder
High input sensitivity
Independent input gain adjustment for caller ID
signal and call waiting signal inputs
Power-down mode
Crystal oscillator circuit built-in
Single supply operation:4.5 to 5.5V
Molybdenum-gate CMOS process
AGND
TIP
RING
TRQ
GND
OSCIN
OSCOUT
MODE
TEST
DOUT
1
20
DT1
DT2
DTQ
S0
S1
VDD
CDET
CR
DTDET
SM8224B
APPLICATIONS
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Telephones, fax machines and modems that sup-
port pre- and mid-conversation information ser-
vices
Adapters for pre- and mid-conversation informa-
tion service functions
Telephone answering machines
Facsimile machines
Computer peripheral equipment
10
11
STR
ORDERING INFORMATION
D e vice
SM8224BM
SM8224BS
P ackag e
20-pin SSOP
20-pin SOP
NIPPON PRECISION CIRCUITS—1