MSP3401G datasheet(32/104 Pages) MICRONAS

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MSP 34x1G

PRELIMINARY DATA SHEET

Micronas

LOUDSPEAKER AND HEADPHONE PROCESSING

00 00hex

00 06hex

Volume Loudspeaker

Volume Headphone

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 condition)

FFhex

Fast Mute (needs about 75 ms until the signal is com-

pletely ramped down)

bit[7:5]

higher resolution volume table

+0dB

+0.125 dB increase in addition to the volume table

...

+0.875 dB increase in addition to the volume table

bit[4]

must be set to 0

bit[3:0]

clipping mode

reduce volume

reduce tone control

compromise

3dynamic

With large scale input signals, positive volume settings may lead to signal clipping.

The MSP 34x1G loudspeaker and headphone volume function is divided into a

digital and an analog section. With Fast Mute, volume is reduced to mute posi-

tion by digital volume only. Analog volume is not changed. This reduces any

audible DC plops. To turn volume on again, the volume step that has been used

before Fast Mute was activated must be transmitted.

If the clipping mode is set to “reduce volume”, the following rule is used: To pre-

vent severe clipping effects with bass, treble, or equalizer boosts, the internal

volume is automatically limited to a level where, in combination with either bass,

treble, or equalizer setting, the amplification does not exceed 12 dB.

If the clipping mode is “reduce tone control”, the bass or treble value is

reduced if amplification exceeds 12 dB. If the equalizer is switched on, the gain

of those bands is reduced, where amplification together with volume exceeds

12 dB.

If the clipping mode is “compromise”, the bass or treble value and volume are

reduced half and half if amplification exceeds 12 dB. If the equalizer is switched

on, the gain of those bands is reduced half and half, where amplification

together with volume exceeds 12 dB.

If the clipping mode is “dynamic”, volume is reduced automatically if the signal

amplitudes would exceed

−2 dBFS within the IC. For operation of MDB, dyna-

mic mode must be switched on.

VOL_MAIN

VOL_AUX

Table 3–11: Write Registers on I2C Subaddress 12hex, continued

Address

Function

Name

MSP3401G Datasheet(PDF) 32 Page - Micronas

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