關鍵詞： 24位音頻CODEC , AK4627 , AKM

AKM公司的AK4627是高性能多路24位音頻CODEC,具有四路ADC和六路DAC. 四路ADC有64x過取樣,取樣速率高達96kHz,S/(N+D)為92dB,動態范圍單端為102dB,差分為103dB; 六路DAC有128x過取樣,取樣速率高達192kHz,24位8倍數字濾波器,S/(N+D)為90dB,動態范圍為106dB,主要用在家庭影院和汽車音頻設備等各種音頻設備.本文介紹了AK4627主要特性,方框圖, 典型應用電路圖和評估板AKD4627-A主要功能,電路圖和PCB布局圖.

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

2011-7-19 12:42:43 上傳

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圖1. AK4627方框圖

2011-7-19 12:40:59 上傳

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圖2. AK4627典型應用電路圖

評估板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.

評估板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

2011-7-19 12:40:59 上傳

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圖3.評估板AKD4627-A方框圖

2011-7-19 12:40:59 上傳

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