原标题：AKM AK4432 32位立体声数字音频系统DAC解决方案

　　akm公司的AK4432是用于数字音频系统的32位立体声数模转换器(DAC),集成了32位高音质低群时延的数字滤波器,THD+N为91dB,128倍过取样,主要用在汽车和家庭影院音频环绕声系统.本文介绍了AK4432主要特性,框图,以及评估板AKD4432-SA功能,框图,元件分布图和电路图.

　　The AK4432 is a 32-bit Stereo DAC which corresponds to digital audio systems. An internal circuitincludes newly developed 32-bit Digital Filter achieving short group delay and high quality sound. TheAK4432 has single end SCF outputs, increasing performance for systems with excessive clock jitter. TheAK4432 is ideal for a wide range of applications that demands high sound quality including Home Theaterand Car audio surround systems. It is housed in a 16-pin TSSOP package, saving more board space.

　　AK4432主要特性:

　　1. 2ch 32bit DAC

　　- 128 times Oversampling

　　- 32-bit High Quality Sound Low Group Delay Digital Filter

　　- Single Ended Output, Smoothing Filter

　　- THD+N: 91dB

　　- DR, S/N: 108dB

　　- Channel Isolation Digital Volume (12dB～-115dB, 0.5dB Step, Mute)

　　- Soft Mute

　　- De-emphasis Filter (32kHz, 44.1kHz, 48kHz)

　　- I/F Format: MSB justified, LSB justified, I2S, TDM

　　- Zero Detection

　　2. Sampling Frequency

　　- Normal Speed Mode: 8kHz to 48kHz

　　- Double Speed Mode: 64kHz to 96kHz

　　- Quad Speed Mode: 128kHz to 192kHz

　　3. Master Clock

　　256fs, 384fs, 512fs or 768fs (Normal Speed Mode: fs=8kHz 48kHz)

　　256fs or 384fs (Double Speed Mode: fs=48kHz 96kHz)

　　128fs or 192fs (Quad Speed Mode: fs=96kHz 192kHz)

　　4. P Interface: 3-wire Serial (7MHz max)/ I2C bus (400kHz Mode, 1MHz Mode)

　　5. Power Supply

　　- Analog: AVDD = 3.0  3.6V

　　- Input/Output Buffer: LVDD = 3.0  3.6V

　　- Integrated LDO for Digital Power Supply

　　6. Power Consumptions: 7.8mA (fs=48kHz)

　　7. Operational Temperature: Ta = - 40  105℃

　　8. Package: 16-pin TSSOP (0.65mm pitch)

　　图1.AK4432框图

　　评估板AKD4432-SA

　　The AKD4432-SA is an evaluation board for the AK4432 (32-bit 2ch DAC) , allowing quick evaluationwith digital audio interface.

　　评估板AKD4432-SA功能:

　　3 type digital audio interface

　　- Optical input

　　- BNC input

　　- External input

　　2ch Analog outputs

　　USB Port for Serial control

　　图2.评估板AKD4432-SA元件分布框图

　　图3.评估板AKD4432-SA框图