AS2525 datasheet(12/26 Pages) AMSCO

12 / 26 page

Preliminary

AS2525

Rev. 1.3

Page 12

May 1999

Table 18: Handsfree attenuation scheme

Speech

Mode

RX-gain

TX-gain

Remark

RX > TX_atten

Receive

0 dB to -20 dB

-50 dB to -30 dB

adjustable with [V+]/[V-] keys in 8

steps

TX_atten > RX

Idle

-25 dB

middle position

TX_atten > RX

Yes

Transmit

-50 dB

0 dB

independent of [V+]/[V-] keys

-50dB

-25dB

0dB

TX-mode

RX-mode

IDLE-mode

Vol min

Vol default

Vol max

TX-gain

RX-gain

-10dB

-20dB

-40dB

-30dB

Figure 11: Gain transition of voice switching

Loudhearing

A loudhearing mode can be enabled/disabled through

the set-up programming.

Table 19: Loudhearing mode selection

[PG] + [0] + (Password) + [#] + [7] + (digit) + [PG]

Digit

Loudhearing

[0]

Enabled (LH + HF provided)

[1]

Disabled (only HF is provided)

Headset mode

Head set mode is selected by connecting pin "HEAD"

to V

DD and enabling the head function by service code

programming (see also Table 3: Parameter settings).

Table 20: Headset Tx gain setting

[PG] + [0] + (Password) + [0] + [7] + (x) + [PG]

Key

(x)

Tx Gain (dB)

M1/2 to LS

Key

(x)

Tx Gain (dB)

M1/2 to LS

[0]

[8]

[1]

[9]

[2]

[M1]

[3]

[M2]

[4]

[M3]

[5]

[M4]

[6]

[M5]

[7]

[M6]

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