[原创] AKM AK7757集成音频DSP的数字音频解决方案

AKM公司的AK7757是一款内置4通道DAC、一个可选输入立体声ADC通道、一个单声道ADC和一个数字音频接口的数字音频信号处理器。该音频数字信号处理器具有在48kHz的采样速率下达到1536阶的并行算法操作性能。本文详细介绍了AK7757的主要特性、内部框图、内部DSP框图以及采用AK7757芯片设计的评估开发板，通过评估板详细介绍了AK7757芯片各种模式下的应用设置及测试，评估板主要有评估板框图、电路原理图。

The AK7757 is a digital signal processor with an integrated 4ch DAC, a stereo ADC with input selector, a mono ADC and an integrated digital audio interface. The audio DSP has 1536 step/fs (at 48kHz sampling) parallel arithmetic operation performance. As the AK7757 is a RAM based DSP, it is programmable for user requirements to realize the audio effects process or the proprietary high-performance HF. It is housed in a 48pin LQFP which is a small package to save the PCB space.

AK7757主要特性

􀂆DSP
- Word length: 24bits (Data RAM: F24 floating point)
- Processing Speed: 13.6 ns (9216step/fs; fs = 8kHz)
- Multiplication: 20 x 20 → 36-bit Double precision arithmetic available
- Divider 20 / 20 → 20-bit
- ALU: 40-bit arithmetic operation (overflow margin 4bits) 24-bit floating point arithmetic and logic operation
- Program RAM: 4096 x 36bits
- Coefficient RAM: 4096 x 20bits
- Data RAM: 2048 x 24bits (F24 floating point)..

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