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AS2525 Fiches technique(PDF) 11 Page - ams AG

No de pièce AS2525
Description  Single-Chip Handsfree Phone CMOS Integrated Circuit
PDF  26 Pages
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Fabricant  AMSCO [ams AG]
Site Internet  http://www.ams.com
Logo AMSCO - ams AG

AS2525 Fiches technique(HTML) 11 Page - ams AG

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Preliminary
AS2525
Rev. 1.3
Page 11
May 1999
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 -15 dB. The following table (Table 18: Handsfree
attenuation scheme) shows how voice switching is
controlled.
TX_atten
Backgnd
noise
monitor
Voice
switching
speech
RX
voice switching circuit
Figure 9: 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
RO
RECI
+3dB
+14dB
Voice
switching
speech
Gmax = -4dB … +16dB (VOL)
Gmin = -33dB
Offset
comp
Compress
Peak
detector
Cmicoffset
+23dB
CBckgnd
Offset
comp
Compress
Peak
detector
CTXoffset
Offset
comp
Compress
Peak
detector
LINE
Gmax = +9dB
Gmin = -21dB … -40dB (VOL)
+12dB
RECV
FT2
FT1
CBN
+8dB
Figure 10: Signal path of handsfree circuit



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