ADAU1361BCPZ-R7 datasheet(53/78 Pages) AD

53 / 78 page

Data Sheet

ADAU1361

CONTROL REGISTERS

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Rev. E | 53 of 78

Table 40. ALC Control 2 Register (Continued)

Bits

Bit Name

Description

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

0010

96 ms

0011

192 ms

0100

384 ms

0101

768 ms

0110

1.54 sec

0111

3.07 sec

1000

6.14 sec

1001

12.29 sec

1010

24.58 sec

1011

49.15 sec

1100

98.30 sec

1101

196.61 sec

1110

393.22 sec

1111

786.43 sec

R14: ALC Control 3, 16,404 (0x4014)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

NGTYP[1:0]

NGEN

NGTHR[4:0]

Table 41. ALC Control 3 Register

Bits

Bit Name

Description

[7:6]

NGTYP[1:0]

Noise gate type. When the input signal falls below the threshold for 250 ms, the noise gate can hold a constant PGA gain, mute the ADC

output, fade the PGA gain to the minimum gain value, or fade then mute.

Setting

Noise Gate

Hold PGA constant (default)

Mute ADC output (digital mute)

Fade to PGA minimum value (analog fade)

Fade then mute (analog fade/digital mute)

NGEN

Noise gate enable.

0 = disabled (default).

1 = enabled.

[4:0]

NGTHR[4:0]

Noise gate threshold. When the input signal falls below the threshold for 250 ms, the noise gate is activated. A 1 LSB increase corresponds

to a −1.5 dB change. See Table 72 for a complete list of the threshold settings.

Setting

Threshold

00000

−76.5 dB (default)

00001

−75 dB

…

11110

−31.5 dB

11111

−30 dB

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