Analog Devices ADAU1961 Manual page 51

R11: ALC Control 0, 16,401 (0x4011)
Bit 7
PGASLEW[1:0]
Table 36. ALC Control 0 Register
Bits Bit Name
[7:6] PGASLEW[1:0]
[5:3] ALCMAX[2:0]
[2:0] ALCSEL[2:0]
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Bit 6 Bit 5
Description
PGA volume slew time when the ALC is off. The slew time is the period of time that a volume increase or decrease
takes to ramp up or ramp down to the target volume set in Register R8 (left differential input volume control)
and Register R9 (right differential input volume control).
Setting
00
01
10
11
The maximum ALC gain sets a limit to the amount of gain that the ALC can provide to the input signal. This
protects small signals from excessive amplification.
Setting
000
001
010
011
100
101
110
111
ALC select. These bits set the channels that are controlled by the ALC. When set to right only, the ALC responds
only to the right channel input and controls the gain of the right PGA amplifier only. When set to left only, the
ALC responds only to the left channel input and controls the gain of the left PGA amplifier only. When set to
stereo, the ALC responds to the greater of the left or right channel and controls the gain of both the left and
right PGA amplifiers. These bits must be off if manual control of the volume is desired.
Setting
000
001
010
011
100
101
110
111
Bit 4 Bit 3
ALCMAX[2:0]
Slew Time
24 ms (default)
48 ms
96 ms
Off
Maximum ALC Gain
−12 dB (default)
−6 dB
0 dB
6 dB
12 dB
18 dB
24 dB
30 dB
Channels
Off (default)
Right only
Left only
Stereo
Reserved
Reserved
Reserved
Reserved
Rev. 0 | Page 51 of 76
Bit 2 Bit 1
ALCSEL[2:0]
ADAU1961
Bit 0