Datasheet

ManualsBrandsANALOG DEVICES ManualsLinear ICsADAU1761BCPZ-R7

ADAU1761

Rev. C | Page 62 of 92

R13: ALC Control 2, 16,403 (0x4013)

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

ALCATCK[3:0] ALCDEC[3:0]

Table 47. ALC Control 2 Register

Bits Bit Name Description

[7:4] ALCATCK[3:0]

ALC attack time. The attack time sets how fast the ALC starts attenuating after an increase in input level above

the target. A typical setting for music recording is 384 ms, and a typical setting for voice recording is 24 ms.

Setting Attack Time

0000 6 ms (default)

0001 12 ms

0010

24 ms

0011

48 ms

0100

96 ms

0101

192 ms

0110

384 ms

0111

768 ms

1000

1.54 sec

1001

3.07 sec

1010

6.14 sec

1011

12.29 sec

1100

24.58 sec

1101

49.15 sec

1110

98.30 sec

1111

196.61 sec

[3:0] ALCDEC[3:0]

ALC decay time. The decay time sets how fast the ALC increases the PGA gain after a decrease in input level

below the target. A typical setting for music recording is 24.58 seconds, and a typical setting for voice recording

is 1.54 seconds.

Setting Decay Time

0000 24 ms

0001 48 ms