MAS3587F datasheet(47/82 Pages) MICRONAS

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ADVANCE INFORMATION

MAS 3587F

Micronas

VOLUME

00 10

Volume Control

bit[15:8]

Volume table with 1 dB step size

7Fhex

+12 dB (maximum volume)

7Ehex

+11 dB

...

74hex

+1dB

73hex

0dB

72hex

−1dB

...

02hex

−113 dB

01hex

−114 dB

00hex

mute (reset)

bit[7:0]

Not used, must be set to 0

This main volume control is applied to the analog outputs only. It is split

between a digital and an analog function. In order to avoid noise due to large

changes of the setting, the actual setting is internally low-pass filtered.

With large scale input signals, positive volume settings may lead to signal clip-

ping.

VOLUME

00 11

Balance

bit[15:8]

Balance range

7Fhex

left

−127 dB, right 0 dB

7Ehex

left

−126 dB, right 0 dB

...

01hex

left

−1dB, right 0 dB

00hex

left 0 dB, right 0 dB

FFhex

left 0 dB, right

−1dB

...

81hex

left 0 dB, right

−127 dB

80hex

left 0 dB, right

−128 dB

Positive balance settings reduce the left channel without affecting the right

channel; negative settings reduce the right channel leaving the left channel

unaffected.

BALANCE

00 12

Automatic Volume Correction (AVC) Loudspeaker Channel

bit[15:12] 0hex

AVC off (and reset internal variables)

8hex

AVC on

bit[11:8]

8hex

8 s decay time

4hex

4 s decay time

2hex

2 s decay time

1hex

20 ms decay time (intended for quick adaptation to the

average volume level after track or source change)

Note: To reset the internal variables, the AVC should be switched off and then

on again during any track or source change. For standard applications, the

recommended decay time is 4 s.

AVC

Table 3–12: Codec control registers on I2C subaddress 6Chex

Address

(hex)

Function

Name

MAS3587F Datasheet(PDF) 47 Page - Micronas

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