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CD22202 Folha de dados(PDF) 1 Page - Intersil Corporation

Nome de Peças CD22202
Descrição Electrónicos  5V Low Power DTMF Receiver
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Fabricante Electrônico  INTERSIL [Intersil Corporation]
Página de início  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

CD22202 Folha de dados(HTML) 1 Page - Intersil Corporation

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Description
The CD22202 and CD22203 complete dual-tone multiple
frequency (DTMF) receivers detect a selectable group of 12
or 16 standard digits. No front-end pre-filtering is needed.
The only externally required components are an inexpensive
3.579545MHz TV “colorburst’’ crystal (for frequency refer-
ence) and a bias resistor. Extremely high system density is
possible through the use of the clock output of a crystal con-
nected CD22202/CD22203 receiver to drive the time bases
of additional receivers. This is a monolithic integrated circuit
fabricated with low-power, complementary symmetry CMOS
processing. It only requires a single low tolerance power
supply.
The CD22202 and CD22203 employ state-of-the-art circuit
technology to combine the digital and analog functions on
the same CMOS chip using a standard digital semiconductor
process. The analog input is preprocessed by 60Hz reject
and band splitting filters and then hard limited to provide
AGC. Eight Bandpass filters detect the individual tones. The
digital post processor times the tone durations and provides
the correctly coded digital outputs. Outputs interface directly
to standard CMOS circuitry and are three-state enabled to
facilitate bus oriented architectures.
January 1997
Pinout
CD22202, CD22203
(PDIP)
TOP VIEW
D1
EN
IN1633
XEN
ANALOG IN
10
11
12
13
14
15
16
17
18
9
8
7
6
5
4
3
2
1
D2
D4
D8
CLRDV
DV
ATB
XIN
XOUT
VDD
VSS
VSS
HEX/B28
ED (203 ONLY),
NC (202)
Functional Diagram
HIGH B/P
FILTERS
LOW B/P
FILTERS
VOLTAGE
REG./REF.
CHIP
CLOCKS
ATB
XEN
INI633
13
8
12
11
510
7
4
6
15
14
2
1
18
17
16
3
CLRDV
DV
D1
D2
D4
D8
EN
XIN
XOUT
HEX/B28
ED-203
NC-202
VSS
VDD
ANALOG IN
9
Features
• Central Office Quality
• No Front End Band Splitting Filters Required
• Single, Low Tolerance, 5V Supply
• Detects Either 12 or 16 Standard DTMF Digits
• Uses Inexpensive 3.579545MHz Crystal for Reference
• Excellent Speech Immunity
• Output in Either 4-Bit Hexadecimal Code or Binary
Coded 2-of-8
• Synchronous or Handshake Interface
• Three-State Outputs
• Excellent Latch-Up Immunity
Ordering Information
PART
NUMBER
TEMP.
RANGE (oC)
PACKAGE
PKG. NO.
CD22202E
0 to 70
18 Ld PDIP
E18.3
CD22203E
0 to 70
18 Ld PDIP
E18.3
File Number
1695.3
DTMF Receivers/Generators
CD22202, CD22203
5V Low Power DTMF Receiver
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207
| Copyright
© Intersil Corporation 1999


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