原标题：AKM AK7719B移动音频解决方案

　　akm公司的AK7719B是具有5个数字接口端的全集成数字信号处理器(DSP),其嵌入DSP内置编程和数据存储器,硬件加速器,24位字长,异步取样速率转换器(SRC),能进行窄带和宽带语音处理以及全宽带数字音频处理,主要用在智能手机和平板电脑.本文介绍了AK7719B 主要特性,框图,以及评估板AKD7719B-A功能,框图和电路图.

　　The AK7719B is a highly integrated digital signal processor (DSP) with five digital interface ports. The built-in asynchronous sample rate converter (SRC) enables flexible connectivity in various system configurations. AKM’s DSP core is optimized for both narrowband and wideband voice processing, as well as full bandwidth digital audio processing. An integrated clock generator for the DSP master clock eliminates the need for external clocks. The RAM-based DSP can be programmed for user requirements. The AK7719B is housed in a 30-pin CSP package. It is a very low power device, suitable for mobile applications.

　　AK7719B 主要特性:

　　· Applications: Smart Phones, Tablet PCs

　　· Embedded DSP

　　- Flexible programming with built-in program and data memories

　　- Hardware accelerator

　　- Word length: 24-bits (Data RAM 24-bit floating point)

　　- Multiplier 20 x 20 → 40-bits (double precision available)

　　- Divider 20 / 20 → 20-bits

　　- ALU: 44-bit arithmetic operation (with 4-bit overflow margin)

　　24-bit floating point arithmetic and logic operation

　　- Program RAM: 4096w x 36-bits

　　- Coefficient RAM: 2048w x 20-bits

　　- Data RAM: 2048w x 24-bits (24-bit floating point)

　　- Offset Register: 32w x 15-bits

　　- Delay RAM: 16384w x 24-bits(24-bit floating point)

　　- 5625 steps at 16kHz sampling rate, 1875 steps at 48kHz sampling rate

　　- Internal clock generator

　　· Audio Interface Format

　　- Left justified, PCM, I2S,

　　- 16/24bit linear

　　- Sampling rate 8kHz ~ 48kHz

　　- Up/Down Sampling Rate Converter: Port#1 (8kHz ↔ 16kHz)

　　· Asynchronous Sample Rate Converters

　　· μC I/F: I2C-Compatible, SPI

　　· Operational, Sleep and Power-down Modes

　　· Power Supply

　　VDD (DSP Core): 1.2V ±0.1V

　　TVDD (PCM I/F): 1.6V ~ 3.6V

　　· Operating Temperature Range: -40°C ~ 85°C

　　· Package: 30-Pin WL-CSP (2.94mm x 3.14mm, 0.5mm pitch)

　　· Power Consumption: 9.2mA (11mW) typ. (Narrowband Handset mode operation)

　　· Evaluation Board: AKD7719B

　　图1. AK7719B框图

　　评估板AKD7719B-A

　　The AKD7719B-A is an evaluation kit for the AK7719B; a digital signal processor (DSP) with digital interface ports. The built-in asynchronous sample rate converters (SRC) enable flexible connectivity in various system configurations. It realizes an easy evaluation of the audio system by just connecting to the target product via digital input and output pins. A USB connection is adopted for control interface, enabling to develop DSP codes with a PC.

　　评估板AKD7719B-A功能:

　　Write/Read RAM: Access to PRAM, CRAM, OFFRAM and Registers

　　Digital Audio Interface

　　- Test pin header

　　图2. 评估板AKD7719B-A框图

　　图3. 评估板AKD7719B-A外形图