Cirrus CS485xx系列数字音频DSP处理方案
Cirrus公司的CS485xx系列(S48520, CS48540和CS48560)数字音频32位DSP,提供高性能的后处理和不同取样速率的数字音频的混合.DSP每秒可进行300,000,000次乘法和累加运算(MAC),具有业界最精确的72位累加器, 24k x 32 SRAM, 192 kHz SPDIF发送器, 1.8V内核单压和兼容5V的3.3V I/O电压.主要用在汽车音频系统,DTV,HD-DVD和蓝光DVD播放器以及PC扬声器.本文介绍了CS485xx系列主要特性, 系统框图和CDB48500-USB评估板主要特性,方框图和详细电路图.
The CS485xx DSP Family is designed to provide high-performance post-processing and mixing of digital audio. The dual clock domain provided on the PCM inputs allows for the mixing of audio streams with different sampling frequencies. The low-power standby preserves battery life for applications which are always on, but not necessarily processing audio, such as automotive audio systems.
There are three devices comprising the CS485xx family. The CS48520, CS48540 and CS48560 are differentiated by the number of inputs and outputs available. All DSPs support dual input clock domains and dual audio processing paths. All DSPs are available in a 48-pin QFP package.
CS485xx系列主要特性:
Cost-effective, High-performance 32-bit DSP
— 300,000,000 MAC/S (multiply accumulates per second)
— Dual MAC cycles per clock
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