參數(shù)資料
型號(hào)： CD22202E
廠商： HARRIS SEMICONDUCTOR
元件分類： 信令電路
英文描述： 5V Low Power DTMF Receiver
中文描述： TELECOM, DTMF SIGNALING CIRCUIT, PDIP18
文件頁(yè)數(shù)： 5/6頁(yè)
文件大?。?/td> 49K
代理商： CD22202E
4-249
CD22202, CD22203
above 28kHz, the simple RC filter shown below may be
used to band limit the incoming signal. The cut off
frequency is 3.9kHz.
FIGURE 4. FILTER FOR USE IN EXTREME HIGH FREQUENCY
INPUT NOISE ENVIRONMENT
Noise will also be reduced by placing a grounded trace
around XIN and XOUT pins on the circuit board layout when
using a crystal. It is important to note that XOUT is not
intended to drive an additional device. XIN may be driven
externally; in this case, leave XOUT floating.
Timing Waveforms
FIGURE 5.
CD22202
CD22203
33k
0.0015
μ
F
270k
ANALOG
IN
NOISY
SIGNAL
t
ON
t
OFF
PAUSE
ANALOG
INPUT
D1, D2
D4, D8
TONE BURST 1
TONE BURST 2
t
D
t
R
t
SU
t
H
t
CL
t
PW
t
ER
t
ED
CLRDV
DV
ED
(NOTE)
NOTE: Early Detect output is available only on the CD22203.
Guard Time
Whenever the DTMF receiver is continually monitoring a
voice channel containing distorted or musical voices or
tones, additional guard time may be added in order to
prevent false decoding. This may be done in software by
verifying that both ED and DV are present simultaneously for
about 55ms. An appropriate guard time should be selected
to balance the fastest expected dialing speed against the
rejection of distorted or musical voices or tones (most
autodialers operate in the 65ms to 75ms range although a
few generate 50ms tones). A hardware guard time circuit is
shown in Figure 6. R
3
and R
4
should keep the voice
amplitude as low as practical, while R
2
and R
5
adjust
detection speed.
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Tone Time
For Detection
t
ON
40
-
-
ms
For Rejection
t
ON
-
-
20
ms
Pause Time
For Detection
t
OFF
40
-
-
ms
For Rejection
t
OFF
-
-
20
ms
Detect Time
t
D
25
-
46
ms
Release Time
t
R
35
50
ms
Data Setup Time
t
SU
7
-
-
μ
s
Data Hold Time
t
H
4.2
-
5
ms
DV Clear Time
t
CL
-
160
250
ns
CLRDV Pulse Width
t
PW
200
-
-
ns
ED Detect Time
t
ED
7
-
22
ms
ED Release Time
t
ER
2
-
18
ms
Output Enable Time
C
L
= 50pF, R
L
= 1k
-
-
200
300
ns
Output Disable Time
C
L
= 35pF, R
L
= 500
-
-
150
200
ns
Output Rise Time
C
L
= 50pF
-
-
200
300
ns
Output Fall Time
C
L
= 50pF
-
-
160
250
ns
相關(guān)PDF資料
PDF描述
CD22203 5V Low Power DTMF Receiver
CD22204 5V Low Power Subscriber DTMF Receiver
CD22204E R8C Series, 23 Group, WDTO 48P6Q-A
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CD22203 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:5V Low Power DTMF Receiver
CD22203E 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:5V Low Power DTMF Receiver
CD22203ES2497 制造商:Rochester Electronics LLC 功能描述:- Bulk
CD22204 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:5V Low Power Subscriber DTMF Receiver
CD22204 WAF 制造商:Harris Corporation 功能描述:
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