AKM公司的AK4688是立體聲音頻CODEC,集成了具有24位輸入/輸出數(shù)據(jù)的ADC和DAC接口,支持異步操作.64x過取樣,取樣速率高達(dá)48kHz,線性相位數(shù)字抗混淆濾波器,S/(N+D)為83dB,動(dòng)態(tài)范圍105dB,S/N為99dB, 3.3V單電源輸出達(dá)2Vrms,適合用于數(shù)字錄音系統(tǒng),DTV,藍(lán)光記錄儀和家庭影院.本文介紹了AK4688主要特性,方框圖,典型應(yīng)用電路以及評(píng)估板AKD4688-A主要功能,方框圖,電路圖和PCB元件布局圖.
The AK4688 is a stereo audio CODEC. The integrated ADC and DAC interfaces accept up to 24-bit input/output data and support an asynchronous operation. The input range of the pre-amplifier, that supports line inputs, is adjustable by an external resistor. A ground referenced 2Vrms output with a 3.3V single power supply is achieved by an integrated charge pump, reducing external parts such as AC-coupling capacitors and mute circuits. The ADC block of the AK4688 achieves a dynamic range of 99dB, and the DAC block achieves a dynamic range of 105dB. The AK4688 is suitable for digital recording systems, digital TVs, Blu-ray recorders and Home theater systems.
AK4688主要特性:
?? Asynchronous ADC/DAC Operation
?? Capless Stereo Pre-amplifier for Line Input/Output
?? 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 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
PORT1, 2: 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: 36pin QFN
圖1.AK4688方框圖
圖2.AK4688典型應(yīng)用框圖(I2C控制模式, CAD0 引腳= “L”, 主模式)
圖3.AK4688典型應(yīng)用框圖(H/W控制模式, MCLK=768fs, 主模式)
評(píng)估板AKD4688-A
AKD4688-A is an evaluation board for AK4688, 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 AK4688, but also asynchronous operation characteristics. Also, the board could be connected to a digital’s audio equipment easily with S/PDIF connectors.
評(píng)估板AKD4688-A功能:
? Compatible with 2 types of digital audio interface
- Optical (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(píng)估板AKD4688-A框圖
圖5.評(píng)估板AKD4688-A電路圖(1)
圖6.評(píng)估板AKD4688-A電路圖(2)
圖7.評(píng)估板AKD4688-A電路圖(3)
圖8.評(píng)估板AKD4688-A電路圖(4)
圖9.評(píng)估板AKD4688-A電路圖(5)
圖10.評(píng)估板AKD4688-A電路圖(6)
圖11.評(píng)估板AKD4688-A PCB元件布局圖(頂層)
圖12.評(píng)估板AKD4688-A PCB元件布局圖(底層)
詳情請(qǐng)見:
http://www.asahi-kasei.co.jp/akm/en/product/ak4688/akd4688-a-01e.pdf
和
http://www.asahi-kasei.co.jp/akm/en/product/ak4688/akd4688-a-01e.pdf
