AT83SND2CMP3B datasheet(81/241 Pages) ATMEL

81 / 241 page

4341F–MP3–03/06

AT8xC51SND2C/MP3B

15. DAC and PA Interface

The AT8xC51SND2C implements a stereo Audio Digital-to-Analog Converter and Audio Power

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

Figure 15-1. Audio Interface Block Diagram

15.1

DAC

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

verter delivering 93 dB Dynamic Range. It comprises a multibit sigma-delta modulator 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 cascaded, followed by a first order SINC interpo-

lator 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

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

I2S/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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