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AS2525 数据表(PDF) 10 Page - ams AG

部件名 AS2525
功能描述  Single-Chip Handsfree Phone CMOS Integrated Circuit
PDF  26 Pages
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制造商  AMSCO [ams AG]
网页  http://www.ams.com
标志 AMSCO - ams AG

AS2525 数据表(HTML) 10 Page - ams AG

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Preliminary
AS2525
Rev. 1.3
Page 10
May 1999
Table 10: Handsfree Tx gain setting
[PG] + [0] + (Password) + [0] + [3] + (x) + [PG]
Key
(x)
Tx Gain (dB)
M3/4 to LS
Key
(x)
Tx Gain (dB)
M3/4 to LS
[0]
39
[8]
47
[1]
40
[9]
48
[2]
41
[M1]
49
[3]
42
[M2]
50
[4]
43
[M3]
51
[5]
44
[M4]
52
[6]
45
[M5]
53
[7]
46
[M6]
54
The input is differential with an impedance of 10 k
Ω.
The soft clip circuit limits the output voltage swing at
pin LS to 2 V
PEAK when activated.
Table 11: Handsfree Tx soft clipping selection
[PG] + [0] + (Password) + [9] + [2] + (digit) + [PG]
Digit
Handfree Tx Soft Clipping
[0]
Disabled
[1]
Enabled (2 V
PEAK)
There is no LLC option for this path.
Receive Path
The gain of the LS —> RO receive path is default set
to 1 dB. This gain can be changed from -6 dB to 9 dB
in 1 dB steps by set-up programming.
Table 12: Handset Rx gain setting
[PG] + [0] + (Password) + [0] + [2] + (x) + [PG]
Key
(x)
Rx Gain (dB)
LS to RO
Key
(x)
Rx Gain (dB)
LS to RO
[0]
-6
[8]
2
[1]
-5
[9]
3
[2]
-4
[M1]
4
[3]
-3
[M2]
5
[4]
-2
[M3]
6
[5]
-1
[M4]
7
[6]
0
[M5]
8
[7]
1
[M6]
9
The user can also change the gain within this range in
4 dB steps via the [V+]/[V-] keys. The receive default
gain in handset and headset mode must lie between
position 5 and 9 for correct operation of the volume
control. The receive input is the differential signal of
RI and STB. The soft clip circuit limits the output
voltage at RO to 1 V
PEAK. It prevents harsh distortion
and acoustic shock.
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]
22
[8]
30
[1]
23
[9]
31
[2]
24
[M1]
32
[3]
25
[M2]
33
[4]
26
[M3]
34
[5]
27
[M4]
35
[6]
28
[M5]
36
[7]
29
[M6]
37
The user can also change the gain using the [V+]/[V-]
keys (see section "Handsfree"). The volume range is
15 dB (-7/+8 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 V
PEAK.
Table 15: Loudspeaker soft clipping selection
[PG] + [0] + (Password) + [9] + [3] + (digit) + [PG]
Digit
Handfree 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.



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