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75T204

5V Low-Power Subscriber DTMF Receiver

TDK Corporation 

75T204

5V Low-Power Subscriber

DTMF Receiver

DTMF DIALING MATRIX

See Figure 3. Please note that column 3 is for special applications and is not normally used in telephone dialing.

Col 0

Row 0

1

Col 1

2

Col 2

3

Col 3

A

Row 1

4

5

6

B

Row 2

7

8

9

C

Row 3

*

0

#

D

FIGURE 3: DTMF Dialing Matrix

Analog

Input

D1, D2,

D4, D8

DV

ton

Tone burst 1

tD

toff

Pause

tR

Tone burst 2

tS

tH

FIGURE 4: Timing Diagram

4

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