原标题：AKM AK4627高性能四路24位音频CODEC解决方案

　　akm公司的AK4627是高性能多路24位音频CODEC,具有四路ADC和六路DAC. 四路ADC有64x过取样,取样速率高达96kHz,S/(N+D)为92dB,动态范围单端为102dB,差分为103dB; 六路DAC有128x过取样,取样速率高达192kHz,24位8倍数字滤波器,S/(N+D)为90dB,动态范围为106dB,主要用在家庭影院和汽车音频设备等各种音频设备.本文介绍了AK4627主要特性,方框图, 典型应用电路图和评估板AKD4627-A主要功能,电路图和PCB布局图.

　　The AK4627 is a single chip audio CODEC that includes four ADC channels and six DAC channels. The converters are designed with Enhanced Dual Bit architecture for the ADC’s, and Advanced Multi-Bit architecture for the DAC, enabling very low noise performance. The AK4627 ADC supports both single-ended and differential inputs and outputs. A wide range of applications can be realized, including home theater, pro audio and car audio. The AK4627 is available in a 48-pin LQFP package.

　　AK4627主要特性:

　　 4ch 24bit ADC

　　- 64x Oversampling

　　- Sampling Rate up to 96kHz

　　- Linear Phase Digital Anti-Alias Filter

　　- Single-ended / Differential Input

　　- S/(N+D): 92dB (Single-ended, Differential)

　　- Dynamic Range, S/N: 102dB (Single-ended), 103dB (Differential)

　　- Digital HPF for offset cancellation

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

　　 6ch 24bit DAC

　　- 128x Oversampling

　　- Sampling Rate up to 192kHz

　　- 24bit 8 times Digital Filter

　　- Single-ended Outputs

　　- On-chip Switched-Capacitor Filter

　　- S/(N+D): 90dB

　　- Dynamic Range, S/N: 106dB

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

　　- Individual channel digital volume with 128 levels and 0.5dB step

　　- Soft mute

　　- De-emphasis for 32kHz, 44.1kHz and 48kHz

　　- Zero Detect Function

　　 High Jitter Tolerance

　　 TTL Level Digital I/F

　　 3-wire Serial and I2C Bus μP I/F for mode setting

　　 Master clock: 256fs, 384fs or 512fs for fs=32kHz to 48kHz

　　128fs, 192fs or 256fs for fs=64kHz to 96kHz

　　128fs for fs=120kHz to 192kHz

　　 Power Supply: 4.5 to 5.5V

　　 Power Supply for output buffer: 2.7 to 5.5V

　　 Small 48pin LQFP

　　图1. AK4627方框图

　　图2. AK4627典型应用电路图

　　评估板AKD4627-A

　　The AKD4627-A is an evaluation board for the AK4627, a single chip CODEC that includes four channels of ADC and six channels of DAC. The AKD4627-A also has the digital audio interface and can achieve the interface with digital audio systems via opt-connector or BNC connector.

　　评估板AKD4627-A主要功能:

　　• On-board analog output buffer circuit

　　• Compatible with 2 types of interface

　　- AK4118 (DIT&DIR) with optical output/input and BNC output/input

　　- Direct interface with AC3 decoder by 10pin header

　　• 10pin header for serial control interface

　　图3.评估板AKD4627-A方框图