Harris Semiconductor CD22204M, CD22204E Datasheet
4-1
SEMICONDUCTOR
Description
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.
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
Ordering Information
PART
NUMBER
TEMP .
RANGE (oC) PACKAGE PKG. NO.
CD22204E 0 to 70 14 Ld PDIP E14.3
CD22204M 0 to 70 24 Ld Plastic SOIC M24.3
January 1997
Pinouts
CD22204 (PDIP)
TOP VIEW
CD22204 (SOIC)
TOP VIEW
D2
D1
EN
V
DD
NC
XEN
ANALOG
D4
D8
DV
ATB
XIN
XOUT
V
SS
1
2
3
4
5
6
7
14
13
12
11
10
9
8
IN
1
2
3
4
5
6
7
8
9
10
11
12
D2
D1
EN
NC
NC
V
DD
NC
NC
NC
NC
XEN
AIN
16
17
18
19
20
21
22
23
24
15
14
13
D4
NC
NC
DV
NC
NC
NC
XOUT
V
SS
D8
ATB
XIN
Functional Diagram
HIGH B/P
FILTERS
LOW B/P
FILTERS
VOLTAGE
REG./REF.
CLOCK
GENERATOR
CHIP
CLOCKS
ATB
XEN
11
6
10
9
48
DETECTORS AND SIGNAL-
PROCESSING CIRCUITS
5
12
2
1
14
13
3
DV
D1
D4
D8
EN
XIN
XOUT
D2
V
SS
V
DD
PREPROCESSOR/
BANDSPLIT FILTER
ANALOG IN
7
NC
NOTE: Pin numbers are for PDIP.
CD22204
5V Low Power Subscriber
DTMF Receiver
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
© Harris Corporation 1997
File Number 1696.3
4-2
CD22204
Absolute Maximum Ratings (Note 1) Thermal Information
DC Supply Voltage (VDD) (Referenced to VSS Terminal) . . . . . . . 7V
Power Dissipation
TA = 25oC (Derate above TA = 25oC at 6.25mW/oC. . . . . . . . 65mW
Input Voltage Range
All Inputs Except Analog In. . . . . . . . . . . . . . . (VDD 0.5V) to -0.5V
Analog in Voltage Range . . . . . . . . . . . . . (VDD 0.5V) to (VDD -10V)
DC Current into any Input or Output . . . . . . . . . . . . . . . . . . . . . .±20mA
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 175oC
Maximum Junction Temperature (Plastic) . . . . . . . . . . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC
Maximum Lead Temperature (Soldering 10s). . . . . . . . . . . . . 300oC
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Electrical Specifications 0
o
C ≤ TA≤ 70oC, VDD = 5V ±10%
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Frequency Detect Bandwidth ±(1.5 + 2Hz) ±2.3 ±3.5 % of f
O
Amplitude for Detection Each Tone -32
(Note 3)
- -2 dBm Referenced to 600Ω
Minimum Acceptable Twist -8 - +4 dB
60Hz Tolerance - - 0.8 V
RMS
Dial Tone Tolerance “Precise” Dial Tone - - 0 dB Referenced to Lower
Amplitude Tone
Talk Off MITEL Tape #CM7291 - 2 - Hits
Digital Outputs (except XOUT) “0” Level, 400µA Load 0 - 0.5 V
“1” Level, 200µA Load VDD -0.5 - V
DD
V
Digital Inputs “0” Level 0 - 0.3V
DD
V
“1” Level 0.7V
DD
-VDDV
Supply Current TA = 25oC - 10 20 mA
Noise Tolerance MITEL Tape #CM7291
(Note 2)
- - -12 dB Referenced to Lowest
Amplitude Tone
Input Impedance VDD≥ VIN≥ (VDD -10) 100kΩ//15pF 300kΩ -
NOTES:
1. Unused inputs must be connected to VDD or VSS as appropriate.
2. Bandwidth limited (3kHz) Gaussian noise.
3. Lower minimum available, please contact sales office.
(-32dBm = 19.45mV
RMS
, -2dBm = 0.615mV
RMS
)
Tw ist
High Tone
Low To ne
--------------------------- -=
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