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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

图4.评估板AKD4432-SA电路图(1)

图5.评估板AKD4432-SA电路图(2)

图6.评估板AKD4432-SA电路图(3)

图7.评估板AKD4432-SA电路图(4)

图8.评估板AKD4432-SA电路图(5)

图9.评估板AKD4432-SA电路图(6)

关键词： DAC 立体声 数字音频系统 汽车音频环绕声 家庭影院音频环