ADAV4601 datasheet(35/60 Pages) AD

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ADAV4601

Rev. B | Page 35 of 60

Address 0x0106 Automatic Volume Control (Default: 0x350C)

Table 21.

Bit No.

Bit Name

Description

Default

Bits[15:12]

AVC maximum gain

Used to control the maximum gain in the range of 0 dB to 15 dB. This is the maximum gain

that can be applied to the input signal to reach the desired output level.

0011

0x0 = 15 dB

0x1 = 14 dB

0x2 = 13 dB

0x3 = 12 dB

0x4 = 11 dB

0x5 = 10 dB

...

0xF = 0 dB

Bits[11:8]

AVC decay time

Used to control the decay time in the range of 20 ms to 12 sec. The decay time

corresponds to the time required for the output to reach the desired level.

0101

0x0 = 20 ms

0x1 = 100 ms

0x2 = 200 ms

0x3 = 500 ms

0x4 = 1 sec

0x5 = 2 sec

0x6 = 3 sec

0x7 = 4 sec

0x8 = 5 sec

0x9 = 6 sec

0xA = 7 sec

0xB = 8 sec

0xC = 9 sec

0xD = 10 sec

0xE = 11 sec

0xF = 12 sec

Bits[7:4]

AVC maximum attenuation

Used to control the maximum attenuation in the range of −18 dB to −3 dB in

+1 dB steps. This is the maximum attenuation that can be applied to the input

signal to reach the desired output level.

0000

0x0 = −18 dB

0x1 = −17 dB

…

0xE = −4 dB

0xF = −3 dB

Bits[3:0]

AVC output level

Used to control the required output level of the AVC block in the range of −3 dBFS to

−18 dBFS in −1 dB steps. If the input signal is greater than the output level that has

been set by these bits, the gain is automatically reduced.

1100

0x0 = −18 dBFS

0x1 = −17 dBFS

…

0xC = −6 dBFS

0xD = −5 dBFS

0xE = −4 dBFS

0xF = −3 dBFS

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