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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 4/5頁 |
| 文件大?。?/td> | 44K |
| 代理商： | CD22204E |
70
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.
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
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.
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
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.
combination
of
the
high
FIGURE 4. FILTER FOR USE IN EXTREME HIGH FREQUENCY
INPUT NOISE ENVIRONMENT
TABLE 1. OUTPUT CODES
DIGIT
D8
D4
D2
D1
1
0
0
0
1
2
0
0
1
0
3
0
0
1
1
4
0
1
0
0
5
0
1
0
1
6
0
1
1
0
7
0
1
1
1
8
1
0
0
0
9
1
0
0
1
0
1
0
1
0
*
1
0
1
1
#
1
1
0
0
A
1
1
0
1
B
1
1
1
0
C
1
1
1
1
D
0
0
0
0
XEN
XEN
CD22204
10
9
6
11
ATB
XIN
3.579545MHz
V
DD
XOUT
1M
10
11
6
XIN CONNECTED TO V
DD
UP TO 10 DEVICES
CD22204
COL 0
1209Hz
COL 1
1336Hz
COL 2
1477Hz
COL 3
1633Hz
ROW 0
697Hz
ROW 1
770Hz
ROW 2
852Hz
ROW 3
941Hz
NOTE: Column 3 is for special applications and is not normally used
in telephone dialing.
1
2
3
A
4
5
6
B
7
8
9
C
*
0
#
D
V
DD
V
SS
CMOS
DIGITAL
CIRCUITRY
DIGITAL
OUTPUT
DIGITAL
INPUT
CD22204
33k
0.0015
μ
F
270k
ANALOG
IN
NOISY
SIGNAL
CD22204
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