AKMAK5373带USB2.0接口立体声模数转换办理方案

akm 公司的AK5373是带USB 2.0接口的立体声模数转换器（ADC），包罗有USB串行接口引擎，USB收发器，音频处理区块，端点以及24位立体声音频ADC。集成的PLL可使用多种取样频率，并集成了麦克风放大器和可编程增益放大器。工作电压3.0V-3.6V。本京电港论坛文章先容了AK5373主要特点，方框架图，内部ADC流模式，外部音频处理模式以及系统毗连框架图，AKD5373-A评估板方框架图和电路原理图纸与元件结构图。

The AK5373 is a stereo A/D converter with a USB 2.0 interface. The device includes an integrated USB serial interface engine, a USB transceiver, an audio class processing block, endpoints, and a 24-bit stereo audio ADC. An integrated PLL enables the use of multiple sampling frequencies. A microphone amplifier and an integrated programmable gain amplifier are available for processing low-level signals from an analog microphone element. An external EEP-ROM is used to store the descriptor information.

The AK5373 is housed in a 48-pin package. It is a low power device, operating from +3.3V, and consuming just 100mW in active mode and less than 100μA in suspend mode.

AK5373主要特点：

USB 2.0 compliant (full speed audio class)

USB audio controller

USB serial interface engine

Audio class encoder/decoder

USB synchronization

Synchronous type (synchronize with 1ms SOF)

24-bit stereo A/D converter with mute control

S/(N+D) = 85dB, S/N = 91dB (AVDD=3.3V, MIC-Amp = 0dB)

S/(N+D) = 70dB, S/N = 78dB (AVDD=3.3V, MIC-Amp = +30dB)

Microphone amplifier gain:

0dB, +6dB, +12dB, +18dB, +24dB, +30dB, +36dB

Digital programmable gain: +24dB ~ -31dB, 1dB Step

Integrated PLL supports standard sampling frequencies

8kHz, 11.025kHz, 16kHz, 22.05kHz, 32kHz 44.1kHz, 48kHz

EEP-ROM interface for descriptors

External Digital Audio Interface

Power Management

Low power consumption

30mA in active mode

Less than 100μA in suspend mode

Power Supply:

Analog Power Supply (AVDD): 3.0 ~ 3.6V

Digital Power Supply (DVDD): 3.0 ~ 3.6V

Ta = -10 ~ +70℃

Package:

48pin LQFP (7 x 7 mm, 0.5mm pitch)

图1{京电港论坛}。AK5373方框架图

图2{京电港论坛}。内部ADC流模式

图3{京电港论坛}。外部音频处理模式

图4{京电港论坛}。AK5373系统毗连框架图

AKD5373-A评估板

AKD5373-A is an evaluation board for AK5373, which is a stereo A/D Converter with a USB 2.0 interface. The AK5373 can be tested easily on the AKD5373-A, as the operation of the device is compatible with USB standard audio class. The AKD5373-A has not only an external audio interface, but also an external EEP-ROM that all descriptor contents are stored and customizable.

图5{京电港论坛}。AKD5373-A评估板方框架图

图6{京电港论坛}。AKD5373-A评估板电路原理图纸（1）

图7{京电港论坛}。AKD5373-A评估板电路原理图纸（2）

图8{京电港论坛}。AKD5373-A评估板顶视图
详情请复制打开此衔接地址：
http://www.asahi-kasei.co.jp/akm/en/product/ak5373/ak5373_f00e.pdf
和
http://www.asahi-kasei.co.jp/akm/en/product/ak5373/akd5373-a2-03e.pdf