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AK4687：家庭影院立体声CODEC解决方案
发布时间：2014/7/15 9:35:00 来源：
AKM公司的AK4687是具有两路输入选择器和线路驱动器的异步立体声CODEC,ADC/DAC接口能接纳高达24位输入数据,并支持异步操作.24位立体声ADC采用64x过取样,取样频率高达48kHz,线性相位数字抗混淆滤波器,S/(N+D)为83dB,动态范围99dB,而24位立体声DAC采用128x过取样,取样频率高达192kHz,24位8倍数字滤波器,S/(N+D)为95dB,动态范围105dB.主要用在蓝光影碟机, 家庭影院,DTV,数字录音系统.本文介绍了AK4687主要特性, 方框图,典型应用电路图,以及评估板AKD4687-A功能,方框图和电路图与元件布局图.
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
图1.AK4687方框图
图2.AK4687典型连接图(I2C控制模式, CAD0引脚= “L”,主模式)
图3.AK4687典型连接图(H/W控制模式, MCLK=768fs,主模式)
评估板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.
评估板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
图4.评估板AKD4687方框图
图5.评估板AKD4687略图
图6.评估板AKD4687电路图(1)
图7.评估板AKD4687电路图(2)
图8.评估板AKD4687电路图(3)
图9.评估板AKD4687电路图(4)
图10.评估板AKD4687电路图(5)
图11.评估板AKD4687电路图(6)
图12.评估板AKD4687元件布局图
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
图1.AK4687方框图
图2.AK4687典型连接图(I2C控制模式, CAD0引脚= “L”,主模式)
图3.AK4687典型连接图(H/W控制模式, MCLK=768fs,主模式)
评估板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.
评估板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
图4.评估板AKD4687方框图
图5.评估板AKD4687略图
图6.评估板AKD4687电路图(1)
图7.评估板AKD4687电路图(2)
图8.评估板AKD4687电路图(3)
图9.评估板AKD4687电路图(4)
图10.评估板AKD4687电路图(5)
图11.评估板AKD4687电路图(6)
图12.评估板AKD4687元件布局图
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