AT83SND2CMP3B datasheet(100/241 Pages) ATMEL

100 / 241 page

100

4341F–MP3–03/06

AT8xC51SND2C/MP3B

15.3.1

Audio DAC Start-up Sequence

In order to minimize any audio output noise during the start-up, the following sequence should

be applied.

15.3.1.1

Example of power-on: Path DAC to Headset Output

•

Desassert the Reset: write 07h at address 10h.

•

All precharge and Master on: write FFh at address 0Ch.

•

Line Out On: write 30h at address 00h.

•

Delay 500 ms.

•

Precharge off: write 0Ch at address 01h.

•

Delay 1 ms.

•

Line Out on, DAC On: write 3Ch at address 00h.

15.3.1.2

Example of power-off: Path DAC to Headset Output

•

DAC off: write 30h at address 00h.

•

Master off: write 00h at address 0Ch.

•

Delay 1 ms.

•

All off: write 00h at address 00h

15.3.1.3

Example Start I2S

•Start DCLK.

•

RSTMASK=1.

•

RESFILZ=0 and RSTZ=0.

•

RESFILZ=1 and RSTZ=1.

•

RSTMASK=0.

•

Delay 5 ms.

•

ONDACL=1 and ONDACR=1.

•

Program all DAC settings: audio format, gains...

15.3.1.4

Example Stop I2S:

•

DAC off: ONDACL=0 and ONDACR=0.

•

Stop I2S and DLCK.

15.3.2

Audio PA Sequence

15.3.2.1

PA Power-On Sequence

To avoid an audible ‘click’ at start-up, the input capacitors have to be pre-charged before the

Power Amplifier.

15.3.2.2

PA Power-Off Sequence

To avoid an audible ‘click’ at power-off, the gain should be set to the minimum gain (-22dB)

before setting the Power Amplifier.

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