AKMAK4480信噪比114dB32位蓝光盘系统数模转换方案

akm 公司的AK4480是高性能信噪比达114dB的 32位数模转换器(DAC),包罗有新开辟的低失真宽动态范围的32位数字滤波器,全差分SCF输出,能吸收216kHz PCM数据和1比特DSD数据,非常适合包罗蓝光盘系统和SACD在内的各种应用.本京电港论坛文章先容了AK4480主要特点,方框架图以及典范应用电路,外接多种低通滤波器电路原理图纸.

AK4480: High Performance 114dB 32-Bit DAC

The AK4480 is a 32-bit DAC, which corresponds to Blu-ray Disc systems. An internal circuit includes newly developed 32bit Digital Filter for better sound quality achieving low distortion characteristics and wide dynamic range. The AK4480 has full differential SCF outputs, removing the need for AC coupling capacitors and increasing performance for systems with excessive clock jitter. The AK4480 accepts 216kHz PCM data and 1-bit DSD data, ideal for a wide range of applications including Blu-ray Discs and SACDs.

AK4480主要特点:

• 128x Over Sampling

• Sampling Rate: 30kHz ∼ 216kHz

• 32Bit 8x Digital Filter

- Ripple: ±0.005dB, Attenuation: 70dB

- Minimum delay option GD=7/fs

- Sharp Roll-off Filter

- Slow Roll-off Filter

• High Tolerance to Clock Jitter

• Low Distortion Differential Output

• DSD Data Input

• Digital De-emphasis for 32, 44.1, 48kHz Sampling

• Soft Mute

• Digital Attenuator (Linear 256 steps)

• Mono Mode

• External Digital Filter Mode

• THD+N: -100dB

• DR, S/N: 114dB (117dB when Mono mode)

• I/F Format: 24/32bit MSB justified, 16/20/24/32bit LSB justified, I2S, DSD

• Master Clock:

30kHz ~ 32kHz: 1152fs

30kHz ~ 54kHz: 512fs or 768fs

30kHz ~ 108kHz: 256fs or 384fs

108kHz ~ 216kHz: 128fs or 192fs

• Power Supply: 4.75 ∼ 5.25V

• Digital Input Level: TTL

• Package: 30pin VSOP

图1{京电港论坛}.AK4480方框架图

图2{京电港论坛}.AK4480典范应用电路原理图纸(AVDD=5V, DVDD=5V, 串行控制模式)

图3{京电港论坛}.AK4480外接LPF滤波器(1): PCM (fc = 99.0kHz, Q=0.680)

图4{京电港论坛}.AK4480外接LPF滤波器(2): PCM

图5{京电港论坛}.AK4480外接3阶LPF滤波器: DSD

详情请复制打开此衔接地址:
http://www.akm.com/datasheets/ak4480_f00e.pdf