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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 supply

Analog (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

AKMAK7757集成音频DSP的数字音频解决方案0

图1.内部框图

AKMAK7757集成音频DSP的数字音频解决方案1

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

AKMAK7757集成音频DSP的数字音频解决方案2

图3.参考设计框图

AKMAK7757集成音频DSP的数字音频解决方案3

图4.参考设计原理图(1)

AKMAK7757集成音频DSP的数字音频解决方案4

图5.参考设计原理图(2)

AKMAK7757集成音频DSP的数字音频解决方案5

图6.参考设计原理图(3)

AKMAK7757集成音频DSP的数字音频解决方案6

图7.参考设计原理图(4)

AKMAK7757集成音频DSP的数字音频解决方案7

图8.参考设计原理图(5)

AKMAK7757集成音频DSP的数字音频解决方案8

图9.参考设计原理图(5)

AKMAK7757集成音频DSP的数字音频解决方案9

图10.参考设计原理图(6)

AKMAK7757集成音频DSP的数字音频解决方案10

图11.参考设计原理图(7)

AKMAK7757集成音频DSP的数字音频解决方案11

图12.参考设计原理图(8)

AKMAK7757集成音频DSP的数字音频解决方案12

图13.参考设计原理图(9)

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