cf8224c Nippon Precision Circuits Inc, (NPC), cf8224c Datasheet

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cf8224c

Manufacturer Part Number
cf8224c
Description
Dual-tone Receiver Ic
Manufacturer
Nippon Precision Circuits Inc, (NPC)
Datasheet
OVERVIEW
The SM8224C 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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APPLICATIONS
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ORDERING INFORMATION
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: 2.7 to 5.5V
Molybdenum-gate CMOS process
Package: 20-pin SSOP, Chip form
Telephones, fax machines and modems that support
pre- and mid-conversation information services
Adapters for pre- and mid-conversation informa-
tion service functions
Telephone answering machines
Facsimile machines
Computer peripheral equipment
SM8224CM
CF8224C
Device
20-pin SSOP
Chip form
Package
PINOUT
(Top view)
PACKAGE DIMENSIONS
(Unit: mm)
OSCOUT
0.68 ± 0.12
OSCIN
MODE
AGND
DOUT
RING
TEST
GND
TRQ
7.20 ± 0.05
7.40 max
TIP
0.30 ± 0.10
Dual-Tone Receiver IC
1
10
0.10
0.13
SEIKO NPC CORPORATION —1
0.65
M
20
11
SM8224C
DT1
DT2
DTQ
S0
S1
VDD
CDET
CR
DTDET
STR
0 to 8

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cf8224c Summary of contents

Page 1

... Adapters for pre- and mid-conversation informa- I tion service functions Telephone answering machines I Facsimile machines I Computer peripheral equipment I ORDERING INFORMATION Device SM8224CM CF8224C PINOUT (Top view) AGND OSCIN OSCOUT MODE DOUT PACKAGE DIMENSIONS (Unit: mm) Package 20-pin SSOP Chip form 0.68 ± ...

Page 2

PAD LAYOUT (Unit: µ m) OSCIN OSCOUT MODE PAD NAME and DIMENSIONS Pad number SM8224C TIP AGND DT1 DT2 2 ...

Page 3

BLOCK DIAGRAM TIP RING TRQ DT1 DT2 DTQ Filter AGND Bias Circuit Crystal Oscillator Circuit OSCIN OSCOUT SM8224C FSK Filter Demodulator Carrier Detector Detector Filter Circuit (2130Hz) (2130Hz) Level Detector Detector Filter Circuit (2750Hz) (2750Hz) Level Detector Power-down Circuit MODE ...

Page 4

PIN DESCRIPTION Number Name I/O 1 AGND O Reference voltage output. Internal reference voltage (V 2 TIP I Tip input. Connected to the telephone line through a protection circuit 3 RING I Ring input. Connected to the telephone line through ...

Page 5

SPECIFICATIONS Absolute Maximum Ratings GND = 0V Parameter Symbol Supply voltage range V DD Input voltage range V IN Power dissipation P Storage temperature range T stg Recommended Operating Conditions GND = 0V Parameter Symbol Supply voltage V DD Clock ...

Page 6

AC Electrical Characteristics Measurement conditions 430k Ω 34k Ω 390k Ω , C1= 0.22 µ F FSK decoder V = 2.7 to 5.5V, GND = 0V CLK Parameter Input sensitivity ...

Page 7

Timing Characteristics FSK decoder V = 2.7 to 5.5V, GND = 0V CLK Parameter Power-down release to start-up time Carrier detection ON time Final data to carrier detection OFF time Output timing V = 2.7 to 5.5V, GND ...

Page 8

TIMING DIAGRAMS FSK demodulator timing 1st Ring L1/L2 PDWN CDET DOUT OSCOUT PDWN is an internal signal (set by S0, S1, MODE) Output timing DOUT DOUT STR STR Data timing STOP TIP/RING IDD DOUT b4 b5 ...

Page 9

FUNCTIONAL DESCRIPTION The SM8224C receiver with caller ID service conforms to the Bellcore standards. It incorporates FSK demod- ulator and dual-tone detection functions in a single chip. It has a dedicated dual-tone signal input so that the FSK signal input ...

Page 10

TYPICAL APPLICATION CIRCUIT Speech Network Circuit VDD Protection Circuit VDD Circuit values are preliminary. SM8224C ...

Page 11

Please pay your attention to the following points at time of using the products shown in this document. The products shown in this document (hereinafter “Products”) are not intended to be used for the apparatus that exerts harmful influence on ...

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