AS2525 datasheet(13/26 Pages) AMSCO

13 / 26 page

Preliminary

AS2525

Rev. 1.3

Page 13

May 1999

Table 21: Headset Rx gain setting

[PG] + [0] + (Password) + [0] + [8] + (x) + [PG]

Key

(x)

Rx Gain (dB)

LS to RO

Key

(x)

Rx Gain (dB)

LS to RO

[0]

-6

[8]

[1]

-5

[9]

[2]

-4

[M1]

[3]

-3

[M2]

[4]

-2

[M3]

[5]

-1

[M4]

[6]

[M5]

[7]

[M6]

If this mode is entered both hook inputs HS and HF

act as electronic off-hook for handset operation. The

gain in transmit and receive can be programmed by

service code programming. The pin "HEAD" is only

scanned once after off-hook and any change on this

pin during one session will be ignored.

Ring Frequency Detection

The ring frequency detector assures that only signals

with a frequency between 13 Hz and 70 Hz are

regarded as valid ring signals.

When a valid ring signal is present for 100 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 invalid ring

signal respectively (until next POR or off-hook).

DC/DC converter

When a valid ring signal is detected, the dc/dc

converter is started.

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