MSP4458 datasheet(29/85 Pages) MICRONAS

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PRELIMINARY DATA SHEET

MSP 44x8G

Micronas

MAIN AND AUX PROCESSING

00 00hex

00 06hex

Volume Main

Volume Aux

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[4:0]

not used

must be set to 0

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

The MSP 44x8G Main and Aux volume function is divided into a digital and an

analog section. With Fast Mute, volume is reduced to mute position by digital vol-

ume 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.

VOL_MAIN

VOL_AUX

0029hex

Automatic Volume Correction (AVC)

bit[15]

AVC off, reset of internal variables

1AVC on

bit[14]

AVC in Main path

AVC in Mixer path

bit[13:12]

must be set to zero

bit[11:8]

8 s decay time

4 s decay time (recommended)

2 s decay time

20 ms decay time (should be used for approx. 100 ms

after channel change)

AVC

AVC_DECAY

00 34hex

Preemphasis Aux Channel

bit[15:8]

00hex

Preemphasis OFF

7Fhex

Preemphasis 50

µs (−3 dB scaling)

FFhex

Preemphasis 75

µs (−3 dB scaling)

PREEMP_AUX

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

Address

Function

Name

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