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AT83SND2CMP3B Datasheet(PDF) 81 Page - ATMEL Corporation |
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AT83SND2CMP3B Datasheet(HTML) 81 Page - ATMEL Corporation |
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81 / 241 page  81 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 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 I2S/PCM Audio DSEL DCLK SCLK DOUT Audio Decoder Interface PA Audio DAC Unit HSR HSL AUXP AUXN LINEL LINER MONOP MONON PAINP PAINN HPP HPN AUDCDIN AUDCCLK AUDCCS AUDCDOUT |
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