MSP3400CPP View Datasheet(PDF) - Micronas

Part Name

Description

Manufacturer

MSP3400CPP

Multistandard Sound Processor

Micronas 

PRELIMINARY DATA SHEET

MSP 3400C

7.1.1. Volume Loudspeaker Channel and Head-

phone Channel

Volume

loudspeaker

Volume

headphone

+12 dB

+11.875 dB

+0.125 dB

0 dB

–0.125 dB

–113.875dB

–114 dB

Mute

Fast Mute

0000hex

11 MSBs

0006hex

11 MSBs

0111 1111 000x 7F0hex

0111 1110 111x 7EEhex

0111 0011 001x 732hex

0111 0011 000x 730hex

0111 0010 111x 72Ehex

0000 0001 001x 012hex

0000 0001 000x 010hex

0000 0000 xxxx 00xhex

RESET

1111 1111 111x FFEhex

The highest given positive 11-bit number (7F0hex) yields

in a maximum possible gain of 12 dB. Decreasing the

volume register by 1 LSB decreases the volume by

0.125 dB. Volume settings lower than the given mini-

mum mute the output. With large scale input signals,

positive volume settings may lead to signal clipping.

With Fast Mute, volume is reduced to mute position by

digital volume only. Analog volume is not changed. This

reduces any audible DC plops. Going back from Fast

Mute should be done to the volume step before Fast

Mute was activated.

Clipping Mode

loudspeaker

Clipping Mode

headphone

Reduce Volume

Reduce Tone Control

Compromise Mode

0000hex

0006hex

x000

RESET

x001

x010

3 LSBs

3 LSBs

0hex

1hex

2hex

If the clipping mode is set to “Reduce Volume”, the fol-

lowing clipping procedure is used: To prevent 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 set-

ting, 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 ex-

ceeds 12 dB.

If the clipping mode is “Compromise Mode”, the bass or

treble value and volume are reduced half and half if am-

plification exceeds 12 dB (see example below). If the

equalizer is switched on, the gain of those bands is re-

duced half and half, where amplification together with

volume exceeds 12 dB.

Example:

Red. Volume

Red. Tone Con.

Compromise

Vol.:

+6 dB

3

6

4.5

Bass:

+9 dB

9

6

7.5

Treble:

+5 dB

5

5

5

Micronas

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