ADAU1361BCPZ-R7 datasheet(52/78 Pages) AD

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Data Sheet

ADAU1361

CONTROL REGISTERS

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Rev. E | 52 of 78

Table 39. ALC Control 1 Register (Continued)

Bits

Bit Name

Description

1011

5.4682 sec

1100

10.936 sec

1101

21.873 sec

1110

43.745 sec

1111

87.491 sec

[3:0]

ALCTARG[3:0]

ALC target. The ALC target sets the desired ADC input level. The PGA gain is adjusted by the ALC to reach this target level. The

recommended target level is between −16 dB and −10 dB to accommodate transients without clipping the ADC.

Setting

ALC Target

0000

−28.5 dB (default)

0001

−27 dB

0010

−25.5 dB

0011

−24 dB

0100

−22.5 dB

0101

−21 dB

0110

−19.5 dB

0111

−18 dB

1000

−16.5 dB

1001

−15 dB

1010

−13.5 dB

1011

−12 dB

1100

−10.5 dB

1101

−9 dB

1110

−7.5 dB

1111

−6 dB

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 40. 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

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