原标题：AKM AK4616单片音频24位CODEC解决方案

　　akm公司的AK4616是单片音频24位CODEC,集成了三路ADC和五路DAC,模拟输入支持差分/单端输入.ADC的S/N达到99dB,S/(N+D) 为88dB,取样频率从8kHz到48kHz.DAC动态范围105dB,集成了全范围数字音量控制,和音频DSP就能构成汽车音频系统.本文介绍了 AK4616主要特性,框图以及评估板AKD4616-A功能,框图和电路图.

　　The AK4616 is a single chip audio CODEC that includes three channel ADCs and five channel DACs. The analog inputs support differential/single-ended with 4:1 stereo selector in front of 2-channel 99dB ADC, and monaural ADC for guidance sound. The high performance 5-channel DAC integrates full-range digital volume control and achieves 105dB dynamic range. A car audio system can be easily designed with an audio DSP and the AK4616. The AK4616 is housed in a space saving 48-pin LQFP package.

　　AK4616主要特性:

　　• 2ch ADC

　　- Sampling Frequency: 8KHz to 48KHz

　　- 4 System in / 1 out (Diffrentialx3, single endx1)

　　- ADC S/N: 99dB, S/ (N+D): 88dB

　　- I/F format: MSB justified, I2S or TDM

　　• 1ch ADC for Monaural Audio Input

　　- Sampling Frequency: 8KHz to 48KHz

　　- ADC S/N: 97dB, S/ (N+D): 87dB

　　- I/F format: MSB justified, I2S or TDM

　　• 4ch DAC

　　- Sampling Frequency: 8KHz to 48KHz

　　- DAC S/N: 105dB, S/ (N+D): 95dB

　　- I/F format: MSB justified, LSB justified (16bit, 20bit, 24bit), I2S or TDM

　　• Monaural DAC

　　- Sampling Frequency: 8KHz to 48KHz

　　- DAC S/N: 107dB, S/ (N+D): 100dB

　　- I/F format: MSB justified, LSB justified (16bit, 20bit, 24bit), I2S or TDM

　　• Microphone Interface

　　- Differential

　　- Programmable Gain (+33dB to +15dB and 0dB, 3dB step)

　　- Low Noise Microphone Bias

　　• Digital Processing

　　- Individual Channel Independent Digital Volume for DAC (0dB to -127dB, 0.5dB step)

　　- Monaural Audio Input Mixing and Individual Channel Digital Volume for ADC (0dB to -127dB, 0.5dB step)

　　- Soft mute

　　• Master Clock

　　- 256fs, 384fs, 512fs

　　• μP I/F: I2C-slave

　　• Power Supply

　　- Analog Power Supply: A3V31,A3V32 = 3.0V to 3.6V (typ.3.3V)

　　- Digital Power Supply1: D3V3 = 3.0V to 3.6V (typ.3.3V)

　　- Digital Power Supply2: D1V8 = 1.7 to 1.9V (typ.1.8V)

　　• Operating temperature range: -40℃ to 85℃

　　• Package: 48-pin LQFP

　　图1. AK4616框图

　　评估板AKD4616-A

　　The AKD4616-A is an evaluation board for AK4616, which is a 24bit CODEC including 3ch ADC, 5ch DAC and microphone amplifier. The control settings of this board may be controlled via USB port, allowing for easy A/D and D/A evaluation. RCA connectors are used for the input and output of the analog signals. This board

　　评估板AKD4616-A功能:

　　 Clock generate circuits (AK4118A used)

　　 Compatible with 2 types of digital audio interface

　　- Optical input (x1) / Optical output (x1)

　　- 10pin header for interface with external data source

　　 RCA connector for external clock input

　　 ADC 3ch input, DAC 5ch output

　　 USB port and 10pin header for board control

　　图2. 评估板AKD4616-A框图

　　图3. 评估板AKD4616-A平面图