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SA2531DAFA

VERSATILE SINGLE CHIP TELEPHONE WITH 14 NUMBER REPERTORY DIALLER

South African Micro Electronic Systems 

SA2531 A/B/C/E/G/U

Tone Generator

The tone generator incorporates the DTMF tones and 3 basic frequencies for the tone

ringer.

DTMF Tones

The DTMF Tone Generator creates 12 Tones in compliance with CCITT Recommenda-

tion Q23. Signal levels are altered by Mask Option. High group frequencies have a level

2.6dB higher than those of the Low Group.

Details of the DTMF Tones are:

Low group

Digit 1-2-3

Digit 4-5-6

Digit 7-8-9

Digit *-0-#

697Hz

770Hz

852Hz

941Hz

(Error = -.074%)

(Error = -.679%

(Error = -.621%)

(Error = +.139%)

High group

Digit 1-4-7-* 1209Hz

(Error = +.533%)

KEYBORD ARRANGEMENT 1

10 Direct memories (either VOL or +/- keys)

Figure 2

8/24

sames

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