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型號：	S80C51C-20D
廠商：	ATMEL CORP
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 20 MHz, MICROCONTROLLER, PQCC44
封裝：	PLASTIC, LCC-44
文件頁數(shù)：	927/1021頁
文件大?。?/td>	15196K
代理商：	S80C51C-20D

32072H–AVR32–10/2012

AT32UC3A3

34. Audio Bitstream DAC (ABDAC)

Rev: 1.0.1.1

Features

Digital Stereo DAC

Oversampled D/A conversion architecture

– Oversampling ratio fixed 128x

– FIR equalization filter

– Digital interpolation filter: Comb4

– 3rd Order Sigma-Delta D/A converters

Digital bitstream outputs

Parallel interface

Connected to DMA Controller for background transfer without CPU intervention

Overview

The Audio Bitstream DAC converts a 16-bit sample value to a digital bitstream with an average

value proportional to the sample value. Two channels are supported, making the Audio Bit-

stream DAC particularly suitable for stereo audio. Each channel has a pair of complementary

digital outputs, DATAn and DATANn, which can be connected to an external high input imped-

ance amplifier.

The output DATAn and DATANn should be as ideal as possible before filtering, to achieve the

best SNR and THD quality. The outputs can be connected to a class D amplifier output stage to

drive a speaker directly, or it can be low pass filtered and connected to a high input impedance

amplifier. A simple 1st order low pass filter that filters all the frequencies above 50kHz should be

adequate when applying the signal to a speaker or a bandlimited amplifier, as the speaker or

amplifier will act as a filter and remove high frequency components from the signal. In some

cases high frequency components might be folded down into the audible range, and in that case

a higher order filter is required. For performance measurements on digital equipment a minimum

of 4th order low pass filter should be used. This is to prevent aliasing in the measurements.

For the best performance when not using a class D amplifier approach, the two outputs DATAn

and DATANn, should be applied to a differential stage amplifier, as this will increase the SNR

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相關代理商/技術參數(shù)	參數(shù)描述
S80C51C-25	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller
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S80C51FA-1	制造商:未知廠家制造商全稱:未知廠家功能描述:8-Bit Microcontroller

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