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CD22202 Fiches technique(PDF) 5 Page - Intersil Corporation

No de pièce CD22202
Description  5V Low Power DTMF Receiver
Download  6 Pages
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Fabricant  INTERSIL [Intersil Corporation]
Site Internet  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

CD22202 Fiches technique(HTML) 5 Page - Intersil Corporation

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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
µF
270k
ANALOG
IN
NOISY
SIGNAL
tON
tOFF
PAUSE
ANALOG
INPUT
D1, D2
D4, D8
TONE BURST 1
TONE BURST 2
tD
tR
tSU
tH
tCL
tPW
tER
tED
CLRDV
DV
ED
NOTE: Early Detect output is available only on the CD22203.
(NOTE)
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. R3 and R4 should keep the voice
amplitude as low as practical, while R2 and R5 adjust
detection speed.
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Tone Time
For Detection
tON
40
-
-
ms
For Rejection
tON
-
-
20
ms
Pause Time
For Detection
tOFF
40
-
-
ms
For Rejection
tOFF
-
-
20
ms
Detect Time
tD
25
-
46
ms
Release Time
tR
35
50
ms
Data Setup Time
tSU
7-
-
µs
Data Hold Time
tH
4.2
-
5
ms
DV Clear Time
tCL
-
160
250
ns
CLRDV Pulse Width
tPW
200
-
-
ns
ED Detect Time
tED
7
-
22
ms
ED Release Time
tER
2
-
18
ms
Output Enable Time
CL = 50pF, RL = 1kΩ
-
-
200
300
ns
Output Disable Time
CL = 35pF, RL = 500Ω
-
-
150
200
ns
Output Rise Time
CL = 50pF
-
-
200
300
ns
Output Fall Time
CL = 50pF
-
-
160
250
ns


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