AKMAK7757集成音频DSP的数字音频解决方案培训课件

A K M A K7757集成音频D S P的数字音频解决
方案
AKMAK7757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)- Delay RAM: 4096 x 20bits, 4096 x 20bits- Master Clock: 73.7MHz- JX pins (interrupt) 2ch ADC1- Sampling Frequency: 8kHz~48kHz- 3in / 1out
Input Selector (Diffrentialx1 single endx1 single end with
MicAmpx1)- ADC S/N: 96dBA, S/ (N+D): 88dB 1ch ADC2- Sampling Frequency: 8kHz~48kHz- ADC S/N: 89dBA, S/(N+D): 82dB 4ch DAC-
Sampling Frequency: 8kHz~48kHz- DAC S/N: 107dBA, S/ (N+D):
92dB Microphone Interface- Differential or single-end input- Programmable Gain (+33dB ~ +15dB and 0dB, 3dB step)- Low Noise Microphone Bias Automatic Power Down (CODEC, DSP) μP I/F: SPI,
I2C Power supplyAnalog (AVDD): 3.0V ~ 3.6V (typ.3.3V)Digital1 (DVDD): 3.0V ~ 3.6V (typ.3.3V)Digital2 (DVDD18): 1.7V ~ 1.9V
(typ.1.8V) Operating temperature range: -40℃ ~ 85℃ Package: 48pin LQFP图1.内部框图图2.内部DSP框图采用AK7757评估板参考设计The AKD7757-A is an evaluation board for AK7757, which is a highly integrated digital signal processor with an integrated 4ch DAC, a stereo ADC with input selector, a mono ADC and an integrated digital audio interface. This board is composed of a main board and a sub board. The AKD7757-A can be set-up by a PC via USB port. RCA connector is used for both input and output of the analog signal. Digital audio interfaces are also integrated, enabling to Interface with a digital audio system via optical connectors or SMUX-PORTs.AK7757评估板参考设计的主要特性
Read/Write access to PRAM, CRAM, OFREG and registers of the
AK7757 Compatible with 2 types of digital audio interface- Optical input (x1) / Optical output (x1)- 10pin header for interface with external data source (x2) ADC1 6ch input (differential input 3ch, single-end input 3ch), ADC2 1ch input, DAC 4ch output USB port for board control图3.参考设计框图图4.参考设计原理图（1）图5.参考设计原理图（2）
图6.参考设计原理图（3）图7.参考设计原理图（4）图8.参考设计原理图（5）图9.参考设计原理图（5）图10.参考设计原理图（6）图11.参考设计原理图（7）图12.参考设计原理图（8）图13.参考设计原理图（9）。