Intersil Corporation CD22204 Datasheet

CD22204

Data Sheet February 1999 File Number

5V Low Power Subscriber DTMF Receiver

The CD22204 complete dual tone multiple frequency (DTMF)
receiverdetectsa selectable group of 12 or16 standard digits.
No front-end pre-filtering is needed. The only externally
required components are an inexpensive 3.579545MHz TV
‘‘colorb urst’’ 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 ‘‘s witched-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 three­state enabled to facilitate bus oriented architectures.

Ordering Information

PART

NUMBER

CD22204E 0 to 70 14 Ld PDIP E14.3

TEMP .

RANGE (oC) PACKAGE PKG. NO.

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
D1

EN

V

DD

NC

XEN

ANALOG

1
2
3
4
5
6
7

IN

14

D4

13

D8

12

DV

11

ATB

10

XIN

9

XOUT

8

V

SS

1696.4

Functional Diagram

ATB
XEN
XIN

XOUT

7

PREPROCESSOR/

BANDSPLIT FILTER

11

6

10

CLOCK

9

GENERATOR

V

DD

ANALOG IN

NOTE: Pin numbers are for PDIP.

LOW B/P
FILTERS

HIGH B/P

FILTERS

CHIP
CLOCKS

DETECTORS AND SIGNAL-

VOLTAGE

REG./REF.

48

V

SS

5

NC

12

DV

2

D1

1

D2

14

D4

13

D8

PROCESSING CIRCUITS

3

EN

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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

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

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operationofthe
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . .175oC

Maximum Storage Temperature Range. . . . . . . . . . -65oC to 150oC

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . .300oC

Operating Conditions

Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . . .0oC to 70oC

Electrical Specifications 0

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Frequency Detect Bandwidth ±(1.5 + 2Hz) ±2.3 ±3.5 % of f
Amplitude for Detection Each Tone -32

Minimum Acceptable Twist -8 - +4 dB

60Hz Tolerance - - 0.8 V
Dial Tone Tolerance “Precise” Dial Tone - - 0 dB Referenced to Lower

Talk Off MITEL Tape #CM7291 - 2 - Hits
Digital Outputs (except XOUT) “0” Level, 400µA Load 0 - 0.5 V

Digital Inputs “0” Level 0 - 0.3V

Supply Current TA = 25oC - 10 20 mA
Noise Tolerance MITEL Tape #CM7291

o

C ≤ TA≤ 70oC, VDD = 5V ±10%

- -2 dBm Referenced to 600Ω

(Note 3)

Twist

“1” Level, 200µA Load VDD -0.5 - V

“1” Level 0.7V

(Note 2)

High Tone

--------------------------- -=

Low Tone

DD

- - -12 dB Referenced to Lowest

-VDDV

DD

DD

O

RMS

Amplitude Tone

V
V

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

, -2dBm = 0.615mV

RMS

RMS

)

68