AKM AK4627高性能四路24位音频CODEC解决方案

关键词： 24位音频CODEC , AK4627 , AKM

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

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图1. AK4627方框图

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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

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图3.评估板AKD4627-A方框图

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