AS2533 datasheet(8/25 Pages) AMSCO

8 / 25 page

Rev. 7

July 1998

Data Sheet

AS2533...6

DTMF

The DTMF generator provides 8 frequencies, namely:

Low group

Digit 1-2-3-A

697 Hz

Digit 4-5-6-B

770 Hz

Digit 7-8-9-C

852 Hz

Digit * -0-# -D

941 Hz

High group

Digit 1-4-7- *

1209 Hz

Digit 2-5-8-0

1336 Hz

Digit 3-6-9-#

1477 Hz

Digit A-B-C-D

1633 Hz (not AS2535)

The MF output level can be set with an external voltage

divider on pin MFL.

Voltage at pin MFL (2)

DTMF Level (Low Group)

1.50 V (A

GND)

-4.0 dBm

1.27 V

-5.2 dBm

1.15 V

-6.4 dBm

1.03 V

-7.6 dBm

0.90 V

-8.8 dBm

0.70 V

-10.0 dBm

0.54 V

-11.2 dBm

0.42 V

-12.4 dBm

0.30 V

-13.6 dBm

0.18 V

-14.8 dBm

0.00 V (V

SS)

-16.0 dBm

LINE = 600 ohm)

The preemphasis is 2.6 dB.

The MF tones are according to CEPT recommendations.

Tone Ringer (Melody/Volume)

The three basic frequencies of the melodies are:

F1 = 800 Hz, F2 = 1067 Hz, and F3 = 1333 Hz (

± 5%).

The repetition rate and the volume of the tone ringer

melodies can be programmed by pressing P/M and #

followed by a digit as follows (not AS2534E):

Digit Repetition Rate

Volume

1 time (50 ms pause)

- 16 dB

1 time (50 ms pause)

- 7 dB

1 time (50 ms pause)

0 dB (max.)

4 time s

- 16 dB

4 times

- 7 dB

4 times (default)

0 dB (max.)

10 times

- 16 dB

10 times

- 7 dB

10 times

0 dB (max.)

None

Off

The procedure is ended by repressing the P/M key.

The default setting is digit 6, i.e. after a power on reset

the device will start up with repetition rate 4 and maximum

volume. If digit 0 is programmed, the tone ringer will be

turned off until next off-hook where it will turn back to the

last setting before 0. The programmed settings are

stored in the on chip RAM.

Repetition rate means that a sequence of 6 frequencies

is repeated 1, 4 or 10 times within 1 second.

The sequence of the frequencies is controlled by the

sequence register as follows:

Sequence

F1 F2 F3 F1 F2 F3 …

The AS2534E is fixed to default settings and can not be

programmed to other settings.

Pacifier Tone

By MF dialling the DTMF tones are provided to the

earpiece as comfort tone.

During programming a key entry is acknowledged by a

pacifier tone of 1477 Hz. The level of the pacifier tone is

approximately 60 mV at the RO output. The duration is

40 ms after every key entry in programme mode.

When terminating the programme mode with the P/M

key an acknowledge tone of 140 ms is provided. An

invalid key entry, however, will cause a termination of

the programme mode indicated by a rejection tone of 4

times 40 ms with 28 ms pauses between the tone bursts.

Ring Frequency Discrimination

The ring frequency discriminator assures that only signals

with a frequency between 13Hz and 70 Hz are regarded

as valid ring signals. The time for recognising a valid ring

signal is 1/f seconds, where 'f' is the ring frequency.

When a valid ring signal is present for 73 ms continuously,

the melody generator is activated and remains active as

long as the ring signal is present.

Once the melody generator has been started, the ring

signal is continuously monitored and the melody

generator is instantly turned on or off according to the

momentary presence of a valid or unvalid ring signal

respectively (until next POR or off-hook).

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