AKM公司的AK4629是高性能多路音频CODEC,包括四路24位ADC和八路24位DAC通路,ADC采用增强双比特架构,DAC采用先进的多比特架构,具有非常低的噪音性能.ADC的取样速率高达96kHz,DAC的取样频率高达192kHz,ADC的S/(N+D)为92dB,动态范围S/N为102dB(单端输入),DAC的S/(N+D)为90dB,动态范围S/N为102dB,主要用在家庭影院,pro audio音响和汽车音响设备.本文介绍了AK4629主要特性, 方框图, 典型应用电路图以及电源连接案例,AKD4629-A评估板主要功能,框图,电路图和元件布局图.
AK4629: High Performance Multi-channel Audio CODEC
The AK4629 is a single chip audio CODEC that includes four ADC channels and eight 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 AK4629 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 AK4629 is available in a 48-pin LQFP package.

AK4629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
8ch 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. AK4629方框图

图2. AK4629典型应用电路图

图3. AK4629电源连接案例

AKD4629-A评估板
The AKD4629-A is an evaluation board for the AK4629, a single chip CODEC that includes four channels of ADC and six channels of DAC. The AKD4629-A also has the digital audio interface and can achieve the interface with digital audio systems via opt-connector or BNC connector.

AKD4629-A评估板功能:
• 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4.AKD4629-A评估板方框图

图5.AKD4629-A评估板电路图(1)

图6.AKD4629-A评估板电路图(2)

图7.AKD4629-A评估板电路图(3)

图8.AKD4629-A评估板电路图(4)

图9.AKD4629-A评估板电路图(5)

图10.AKD4629-A评估板电路图(6)

图11.AKD4629-A评估板元件布局图