AKM AK4688立体声音频CODEC解决方案
原标题:AKM AK4688立体声音频CODEC解决方案
akm公司的AK4688是立体声音频CODEC,集成了具有24位输入/输出数据的ADC和DAC接口,支持异步操作.64x过取样,取样速率高达48kHz,线性相位数字抗混淆滤波器,S/(N+D)为83dB,动态范围105dB,S/N为99dB, 3.3V单电源输出达2Vrms,适合用于数字录音系统,DTV,蓝光记录仪和家庭影院.本文介绍了AK4688主要特性,方框图,典型应用电路以及评估板AKD4688-A主要功能,方框图,电路图和PCB元件布局图.
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
图1.AK4688方框图
图2.AK4688典型应用框图(I2C控制模式, CAD0 引脚= “L”, 主模式)
图3.AK4688典型应用框图(H/W控制模式, MCLK=768fs, 主模式)
评估板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.
评估板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
图4.评估板AKD4688-A框图
责任编辑:HanFeng
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