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PDF CD22204 Data sheet ( Hoja de datos )
| Número de pieza | CD22204 | |
| Descripción | 5V Low Power Subscriber DTMF Receiver | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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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
1 page  
CD22204
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
TONE BURST 1
tON
ANALOG
INPUT
D1, D2
D4, D8
tD
tSU
tOFF
PAUSE
tR
TONE BURST 2
tH
DV
FIGURE 5.
PARAMETER SYMBOL MIN TYP MAX UNITS
Tone Time
For Detection
For Rejection
Pause Time
For Detection
For Rejection
Detect Time
Release Time
Data Setup Time
Data Hold Time
Output Enable Time
CL = 50pF, RL = 1kΩ
Output Disable Time
CL = 35pF, RL = 500Ω
Output Rise Time
CL = 50pF
Output Fall Time
CL = 50pF
tON
tON
tOFF
tOFF
tD
tR
tSU
tH
-
-
-
-
40 - - ms
- - 20 ms
40 -
-
- - 20
25 - 46
35 50
7- -
4.2 -
5
- 200 300
ms
ms
ms
ms
µs
ms
ns
- 150 200 ns
- 200 300 ns
- 160 250 ns
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.
Intersil semiconductor products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time with-
out notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site http://www.intersil.com
Sales Office Headquarters
NORTH AMERICA
Intersil Corporation
P. O. Box 883, Mail Stop 53-204
Melbourne, FL 32902
TEL: (407) 724-7000
FAX: (407) 724-7240
EUROPE
Intersil SA
Mercure Center
100, Rue de la Fusee
1130 Brussels, Belgium
TEL: (32) 2.724.2111
FAX: (32) 2.724.22.05
ASIA
Intersil (Taiwan) Ltd.
7F-6, No. 101 Fu Hsing North Road
Taipei, Taiwan
Republic of China
TEL: (886) 2 2716 9310
FAX: (886) 2 2715 3029
71
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| PDF Descargar | [ Datasheet CD22204.PDF ] | |
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