關(guān)鍵詞： AK4629 , AKM , 多路音頻CODEC

AKM公司的AK4629是高性能多路音頻CODEC,包括四路24位ADC和八路24位DAC通路,ADC采用增強(qiáng)雙比特架構(gòu),DAC采用先進(jìn)的多比特架構(gòu),具有非常低的噪音性能.ADC的取樣速率高達(dá)96kHz,DAC的取樣頻率高達(dá)192kHz,ADC的S/(N+D)為92dB,動(dòng)態(tài)范圍S/N為102dB(單端輸入),DAC的S/(N+D)為90dB,動(dòng)態(tài)范圍S/N為102dB,主要用在家庭影院,pro audio音響和汽車音響設(shè)備.本文介紹了AK4629主要特性, 方框圖, 典型應(yīng)用電路圖以及電源連接案例,AKD4629-A評(píng)估板主要功能,框圖,電路圖和元件布局圖.

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

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圖1. AK4629方框圖

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圖2. AK4629典型應(yīng)用電路圖

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圖3. AK4629電源連接案例

AKD4629-A評(píng)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評(píng)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

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圖4.AKD4629-A評(píng)估板方框圖

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圖5.AKD4629-A評(píng)估板電路圖(1)

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圖6.AKD4629-A評(píng)估板電路圖(2)

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圖7.AKD4629-A評(píng)估板電路圖(3)

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圖8.AKD4629-A評(píng)估板電路圖(4)

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圖9.AKD4629-A評(píng)估板電路圖(5)

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圖10.AKD4629-A評(píng)估板電路圖(6)

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圖11.AKD4629-A評(píng)估板元件布局圖
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