SM8224B

NIPPON PRECISION CIRCUITS—1

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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TR-NWT-000030 and SR-TSV-002476 standards

(Bellcore)

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Call waiting

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FSK decoder

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High input sensitivity

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Independent input gain adjustment for caller ID

signal and call waiting signal inputs

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Power-down mode

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Crystal oscillator circuit built-in

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Single supply operation:4.5 to 5.5V

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Molybdenum-gate CMOS process

APPLICATIONS

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Telephones, fax machines and modems that sup-

port pre- and mid-conversation information ser-

vices

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Adapters for pre- and mid-conversation informa-

tion service functions

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Telephone answering machines

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Facsimile machines

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Computer peripheral equipment

ORDERING INFORMATION

PINOUT

(Top view)

D e vice

P a ck ag e

SM8224BM

20-pin SSOP

SM8224BS

20-pin SOP

1

11

20

10

AGND

TIP

RING

TRQ

GND

DT1

DT2

DTQ

S0

S1

VDD

CDET

MODE

OSCIN

OSCOUT

TEST

CR

DTDET

STR

DOUT