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    AKM AK4687家庭影院立體聲CODEC解決方案

    發布時間:2011-9-28 10:26    發布者:Liming
    關鍵詞: AK4687 , AKM , Codec , 家庭影院 , 立體聲
    AKM公司的AK4687是具有兩路輸入選擇器和線路驅動器的異步立體聲CODEC,ADC/DAC接口能接納高達24位輸入數據,并支持異步操作.24位立體聲ADC采用64x過取樣,取樣頻率高達48kHz,線性相位數字抗混淆濾波器,S/(N+D)為83dB,動態范圍99dB,而24位立體聲DAC采用128x過取樣,取樣頻率高達192kHz,24位8倍數字濾波器,S/(N+D)為95dB,動態范圍105dB.主要用在藍光影碟機, 家庭影院,DTV,數字錄音系統.本文介紹了AK4687主要特性, 方框圖,典型應用電路圖,以及評估板AKD4687-A功能,方框圖和電路圖與元件布局圖.

    The AK4687 is a stereo audio CODEC with 2-channel input selector and a line driver. The interfaces of ADC/DAC can accept up to 24bit input data and support asynchronous operation. The input range of the pre-amplifier, that supports 3ch stereo inputs, is selectable by external resistors. Both the input stereo selector and output drivers support ground reference 2Vrms In/Output, making it possible to remove AC-coupling capacitors and reducing external parts. The AK4687 has a dynamic range of 99dB for ADC, 105dB for DAC. It is well suitable for digital recording systems, digital TVs, Blu-ray recorders and Home theater systems.

    AK4687主要特性:

    􀂆 Asynchronous ADC/DAC Operation

    􀂆 3:1 Capless Stereo Line Input Selector

    􀂆 24bit Stereo ADC

    - 64x Oversampling

    - Sampling Rate up to 48kHz

    - Linear Phase Digital Anti-Alias Filter

    - S/(N+D): 83dB

    - Dynamic Range, S/N: 99dB

    - Digital HPF for Offset Cancellation

    􀂆 24bit Two Stereo DAC

    - 128x Oversampling

    - Sampling Rate up to 192kHz

    - 24bit 8 times Digital Filter

    - S/(N+D): 95dB

    - Dynamic Range, S/N: 105dB

    - De-emphasis Filter

    􀂆 High Jitter Tolerance

    􀂆 External Master Clock Input:

    256fs, 384fs, 512fs 768fs (fs=32kHz ∼ 48kHz)

    128fs, 192fs, 256fs 384fs (fs=64kHz ∼ 96kHz)

    128fs, 192fs (fs=128kHz ~ 192kHz)

    􀂆 2 Audio Serial I/F (PORT1, PORT2)

    - Master/Slave mode (PORT1)

    - I/F format

    PORT2: MSB, LSB justified (16/24 bit), I2S

    PORT1: MSB, LSB justified (16/24 bit), I2S

    􀂆 Hardware / I2C-bus Control

    􀂆 Operating Voltage:

    - Digital I/O and Charge Pump: 3.0V ∼ 3.6V

    - ADC Analog: 3.0V ∼ 3.6V

    - DAC Analog: 3.0V ∼ 3.6V

    􀂆 Package: 48pinLQFP

    圖1.AK4687方框圖

    圖2.AK4687典型連接圖(I2C控制模式, CAD0引腳= “L”,主模式)

    圖3.AK4687典型連接圖(H/W控制模式, MCLK=768fs,主模式)

    評估板AKD4687-A

    AKD4687-A is an evaluation board for AK4687, which is a single chip 24bit CODEC with a 2ch ADC and a 2ch DAC. It is possible to evaluate not only A/D and D/A of the AK4687, but also asynchronous operation characteristics. Also, the board could be connected to a digital’s audio equipment easily with S/PDIF connectors.

    評估板AKD4687-A功能:

    􀂆 Compatible with 2 types of digital audio interface

    - BNC (S/PDIF) input/output with DIT/DIR (AK4118A)

    - 10pin headers for interfacing with external data source

    􀂆 Separate power supply or regulator power supply

    􀂆 10pin header for register control

    圖4.評估板AKD4687方框圖

    圖5.評估板AKD4687略圖

    圖6.評估板AKD4687電路圖(1)

    圖7.評估板AKD4687電路圖(2)

    圖8.評估板AKD4687電路圖(3)

    圖9.評估板AKD4687電路圖(4)

    圖10.評估板AKD4687電路圖(5)

    圖11.評估板AKD4687電路圖(6)

    圖12.評估板AKD4687元件布局圖
    詳情請見:
    akd4687-a2-03e.pdf (1.84 MB)
    ak4687_f00e.pdf (484.21 KB)
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