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參數(shù)資料
| 型號(hào)： | CD22204E |
| 廠商： | INTERSIL CORP |
| 元件分類： | 信令電路 |
| 英文描述： | R8C Series, 23 Group, WDTO 48P6Q-A |
| 中文描述： | TELECOM, DTMF SIGNALING CIRCUIT, PDIP14 |
| 封裝： | PLASTIC, DIP-14 |
| 文件頁(yè)數(shù)： | 1/5頁(yè) |
| 文件大小： | 44K |
| 代理商： | CD22204E |
67
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
CD22204
5V Low Power Subscriber DTMF Receiver
The CD22204 complete dual tone multiple frequency (DTMF)
receiver detects 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 reference) and a bias
resistor. Extremely high system density is possible through
the use of the Alternate Time Base (ATB) output of a crystal
connected CD22204 receiver to drive the time bases of up to
10 additional receivers. This is a monolithic integrated circuit
fabricated with low power, complementary symmetry CMOS
processing. It only requires a single power supply.
The CD22204 employs state-of-the-art ‘‘switched-capacitor’’
filter technology, resulting in approximately 40 poles of filtering
and digital circuitry on the same CMOS chip. The analog input
is preprocessed by 60Hz reject and bandsplitting filters and
then zero-cross detected to provide AGC. Eight bandpass
filters detect the individual tones. Digital processing is used to
measure the tone and pause durations and provides the
correctly coded and timed digital outputs. The outputs
interface directly to standard CMOS circuitry and are three-
state enabled to facilitate bus oriented architectures.
Functional Diagram
Features
No Front End Band Splitting Filters Required
Single Low Tolerance 5V Supply
Three-State Outputs for Microprocessor Based
Systems
Detects all 16 Standard DTMF Digits
Uses Inexpensive 3.579545MHz Crystal
Excellent Speech Immunity
Output in 4-Bit Hexadecimal Code
Excellent Latch-Up Immunity
Pinouts
CD22204 (PDIP)
TOP VIEW
Ordering Information
PART
NUMBER
TEMP.
RANGE (
o
C)
PACKAGE
PKG. NO.
CD22204E
0 to 70
14 Ld PDIP
E14.3
HIGH B/P
FILTERS
LOW B/P
FILTERS
VOLTAGE
REG./REF.
C
G
CHIP
CLOCKS
ATB
XEN
11
6
10
9
4
8
D
P
5
12
2
1
14
13
3
DV
D1
D4
D8
EN
XIN
XOUT
D2
V
SS
V
DD
P
B
ANALOG IN
7
NC
NOTE: Pin numbers are for PDIP.
D2
D1
EN
V
DD
NC
XEN
ANALOG
D4
D8
DV
ATB
XIN
XOUT
V
SS
1
2
3
4
5
6
7
14
13
12
11
10
9
8
IN
Data Sheet
February 1999
File Number
1696.4
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| CD22204M | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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| CD22212E | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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