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부품번호 CD22204 기능
기능 5V Low Power Subscriber DTMF Receiver
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CD22204 데이터시트, 핀배열, 회로
Data Sheet
CD22204
February 1999 File Number 1696.4
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.
Ordering Information
PART
NUMBER
CD22204E
TEMP.
RANGE (oC)
PACKAGE
0 to 70 14 Ld PDIP
PKG. NO.
E14.3
Functional Diagram
7
ANALOG IN
11
ATB
6
XEN
XIN
10
LOW B/P
FILTERS
HIGH B/P
FILTERS
CHIP
CLOCKS
VOLTAGE
9 REG./REF.
XOUT
4
VDD
8
VSS
NOTE: Pin numbers are for PDIP.
5
NC
12
DV
2
D1
1
D2
14
D4
13
D8
3
EN
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
D2 1
D1 2
EN 3
VDD 4
NC 5
XEN 6
ANALOG 7
IN
14 D4
13 D8
12 DV
11 ATB
10 XIN
9 XOUT
8 VSS
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 pdf, 반도체, 판매, 대치품
CD22204
3.579545MHz
XIN
10
ATB
11
1M
XOUT
VDD
9
CD22204
6
XEN
XIN CONNECTED TO VDD
10
11 CD22204
XEN
6
UP TO 10 DEVICES
FIGURE 2. CRYSTAL OSCILLATOR
Outputs D1, D2, D4, D8 and EN
Outputs D1, D2, D4, D8 are CMOS push-pull when enabled
(EN high) and open circuited (high impedance) when dis-
abled by pulling EN low. These digital outputs provide the
hexadecimal code corresponding to the detected digit. The
digital outputs become valid after a tone pair has been
detected and they are then cleared when a valid pause is
timed. The table below describes the hexadecimal codes.
TABLE 1. OUTPUT CODES
DIGIT
D8
D4
D2
D1
10001
20010
30011
40100
50101
60110
70111
81000
91001
01010
* 1011
#1100
A1101
B1110
C1 1 1 1
D0 0 0 0
DV
DV signals a detection by going high after a valid tone pair is
sensed and decoded at the output pins D1, D2, D4, and D8.
DV remains high until a valid pause occurs.
N/C Pin
This pin has no internal connection and should be left floating.
DTMF Dialing Matrix
COL 0
1209Hz
COL 1
1336Hz
COL 2
1477Hz
COL 3
1633Hz
ROW 0
697Hz
1
2
3
A
ROW 1
770Hz
4
5
6
B
ROW 2
852Hz
7
8
9
C
ROW 3
941Hz
*
0
#D
NOTE: Column 3 is for special applications and is not normally used
in telephone dialing.
Digital Inputs and Outputs
All digital inputs and outputs of the DTMF receivers are rep-
resented by the schematic below. Only the “analog in” pin is
different, and is described above. Care must be exercised
not to exceed the voltage or current ratings on these pins as
listed in the “maximum ratings” section.
VDD
DIGITAL
INPUT
CMOS
DIGITAL
CIRCUITRY
DIGITAL
OUTPUT
VSS
FIGURE 3. DIGITAL INPUTS AND OUTPUTS
Input Filter
The CD22204 will tolerate total input noise of a maximum
of 12dB below the lowest amplitude tone. For most
telephone applications, the combination of the high
frequency attenuation of the telephone line and internal
band limiting make special circuitry at the input to these
receivers unnecessary. However, noise near the 56kHz
internal sampling frequency will be aliased (folded back)
into the audio spectrum, so if excessive noise is present
above 28kHz, the simple RC filter shown below may be
used to band limit the incoming signal. The cut off
frequency is 3.9kHz.
NOISY
SIGNAL
270k
0.0015µF
ANALOG
IN
33k
CD22204
FIGURE 4. FILTER FOR USE IN EXTREME HIGH FREQUENCY
INPUT NOISE ENVIRONMENT
70

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