AS2525F datasheet(12/28 Pages) AMSCO

12 / 28 page

Datasheet AS2525

austriamicrosystems

Revision 2.1

Page 11 of 27

Table 13: Handset Rx soft clipping selection

[PG] + [0] + (Password) + [#] + [5] + (digit) + [PG]

Digit

Handset Rx Soft Clipping (Earpiece)

[0]

Disabled

[1]

Enabled

There is LLC option for this path.

The gain of the LS —> LO1/LO2 receive path is set to 29

dB.

This gain can be changed by set-up programming from 22

dB to -37 dB in 1 dB steps.

Table 14: Loudspeaker gain setting

[PG] + [0] + (Password) + [0] + [4] + (x) + [PG]

Key

(x)

Rx Gain (dB)

LS to LO1/2

Key

(x)

Rx Gain (dB)

LS to LO1/2

[0]

[8]

[1]

[9]

[2]

[M1]

[3]

[M2]

[4]

[M3]

[5]

[M4]

[6]

[M5]

[7]

[M6]

The user can also change the gain using the [V+]/[V-] keys

(see section "Handsfree"). The volume range is 20 dB (8

steps, each 2.5 dB).

The receive input is the differential signal of RI and STB.

The soft clip circuit limits the output voltage swing at

LO1/LO2 to 1 VPEAK

Table 15: Loudspeaker soft clipping selection

[PG] + [0] + (Password) + [9] + [3] + (digit) + [PG

]

Digit

Handsfree Rx Soft Clipping (Loudspeaker)

[0]

Disabled

[1]

Enabled

There is optional LLC for this path.

Line Loss Compensation (LLC)

The line loss compensation is set-up programmable and

effects only the handset mode.

Table 16: Line loss compensation selection

[PG] + [0] + (Password) + [0] + [5] + (digit) + [PG]

Digit

LLC Range

[0]

No LLC (gain independent of line current)

[1]

-1 dB/5 mA from 20 to 50 mA

[2]

-1 dB/5 mA from 45 to 75 mA

When it is activated, the transmit and receive gains for

both channels are decreased by 6 dB at line currents from

20 mA to 50 mA or from 45 mA to 75 mA depending on

selected range.

Handsfree

The handsfree function allows voice communication without

using the handset (full 2-way speaker phone). Two voice

controlled attenuators prevent acoustic coupling between

the loudspeaker and the handsfree microphone.

The voice switching circuit has three states, namely idle,

transmit or receive. In receive mode the attenuation of the

receive path and the transmit path can be controlled by the

volume keys between 0 dB and -20 dB. The following table

(Table 18: Handsfree attenuation scheme) shows how

voice switching is controlled.

TX_atten

Backgnd

noise

monitor

Voice

switching

speech

voice switching circuit

Figure 6: Handsfree voice switching

A background monitoring circuit is incorporated. This

circuit can be enabled/disabled as required

Table 17: Background noise monitoring selection

[PG] + [0] + (Password) + [#] + [6] + (digit) + [PG]

Digit

Background Noise Monitoring

[0]

Disabled

[1]

Enabled

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