AKD4635 datasheet(48/81 Pages) AKM

48 / 81 page

[AK4635]

Rev. 0.6

2007/10

- 48 -

3. The Volume at the ALC Operation

The current volume value at the ALC operation is reflected by VOL7-0 bits. It is enable to check the current volume value

by reading the register value of VOL7-0 bits.

This function is available only at the time of 3-wire mode. The volume value at the ALC operation can

not be read in I

2C mode.

VOL7-0bits

GAIN(0dB)

F1H

+36.0

F0H

+35.625

EFH

+35.25

C5H

+19.5

92H

+0.375

91H

0.0

90H

−0.375

−53.625

−54.0

MUTE

Table 33. Value of VOL7-0 bits

4. Example of the ALC Operation for Recording Operation

Table 34 shows the examples of the ALC setting for mic recording.

fs=8kHz

fs=16kHz

Comment

Data

Operation

Data

Operation

LMTH1-0

Limiter detection Level

−4.1dBFS

ZELM

Limiter zero crossing detection

Enable

ZTM1-0

Zero crossing timeout period

16ms

WTM2-0

Recovery waiting period

*WTM1-0 bits should be more than or

equal to ZTM1-0 bits

000

16ms

001

16ms

IREF7-0

Maximum gain at recovery operation

C5H

19.5dB

C5H

19.5dB

IVOL7-0

Gain of IVOL

C5H

19.5dB

C5H

19.5dB

LMAT1-0

Limiter ATT step

1step

LFST

Fast Limiter Operation

RGAIN1-0

Recovery GAIN step

1 step

ALC1

ALC enable

Enable

FRSL1-0

Speed of Fast Recovery

4 times

4times

Table 34. Example of the ALC Setting (Recording)

AKD4635 Datasheet(PDF) 48 Page - Asahi Kasei Microsystems

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