TELEFUNKEN Semiconductors

U3810BM

Rev. A1: 19.01.1996

17 (31)

Table 1: Frequency tolerance of the output tones for DTMF signalling tone output frequency when using 455 kHz

Standard frequency

Hz

Tone output

frequency

Frequency deviation

Hz

frequency

Hz

%

Hz

Low Group

697

770

852

941

High Group

1209

1336

1477

1633

697.85

771.18

852.06

940.08

1210.1

1338.2

1477.3

1636.7

0.12

0.15

0.01

– 0.10

0.09

0.17

0.02

0.22

+ 0.85

+ 1.18

+ 0.06

– 0.92

+ 1.1

+ 2.2

+ 0.3

+ 3.7

Note: Frequency can be directly measured on CO when S3 is closed (figure 9)

AMF

SIN0

SIN1

CO

1

1

1

DTMF : HF

0

1

1

DTMF : LF

0

1

0

MELODY

0

0

1

CONFIDENCE TONE

1209

1336

1477

1633

697

1

2

3

A

770

4

5

6

B

852

7

8

9

C

941

*

0

#

D