AT83SND2CMP3 datasheet(21/97 Pages) ATMEL

21 / 97 page

AT83SND2CMP3

7524B–MP3–05/06

DAC and PA Interface The AT83SND2CMP3 implements a stereo Audio Digital-to-Analog Converter and

Audio Power Amplifier targeted for Li-Ion or Ni-Mh battery powered devices.

Figure 19. Audio Interface Block Diagram

DAC

The Stereo DAC section is a complete high performance, stereo, audio digital-to-analog

converter delivering 93 dB Dynamic Range. It comprises a multibit sigma-delta modula-

tor with dither, continuous time analog filters and analog output drive circuitry. This

architecture provides a high insensitivity to clock jitter. The digital interpolation filter

increases the sample rate by a factor of 8 using 3 linear phase half-band filters cas-

caded, followed by a first order SINC interpolator with a factor of 8. This filter eliminates

the images of baseband audio, remaining only the image at 64x the input sample rate,

which is eliminated by the analog post filter. Optionally, a dither signal can be added that

may reduce eventual noise tones at the output. However, the use of a multibit sigma-

delta modulator already provides extremely low noise tones energy.

Master clock is 128 up to 512 times the input data rate allowing choice of input data rate

up to 50 kHz, including standard audio rates of 48, 44.1, 32, 16 and 8 kHz. The DAC

section is followed by a volume and mute control and can be simultaneously played

back directly through a Stereo 32

Ω Headset pair of drivers. The Stereo 32Ω Headset

pair of drivers also includes a mixer of a LINEL and LINER pair of stereo inputs as well

as a differential monaural auxiliary input (line level).

MP3

2S/PCM

Audio

DSEL

DCLK

SCLK

DOUT

Audio

Decoder

Interface

Audio

DAC

Unit

HSR

HSL

AUXP

AUXN

LINEL

LINER

MONOP

MONON

PAINP

PAINN

HPP

HPN

AUDCDIN

AUDCCLK

AUDCCS

AUDCDOUT

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