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本帖最后由 pipi516 于 2014-4-2 08:52 编辑
工作之余,接触到了大功率CLASS D功放,并了解使用了功能强大的音频处理IC:STA309A,十年前就见过它的兄弟型号STA308,当时曾被其震憾到,原来D类功放也能如此好声
音,也才真正接受了解D类.
关于STA309功能,可以下载规格书了解,这里摘要:
8 channels of 24-bit DDX® (direct digital amplification)
>100 dB of SNR and dynamic range
Selectable 32 kHz - 192 kHz input sample rates
6 channels of DSD/SACD input
Digital gain/attenuation +58 dB to -100 dB in 0.5-dB steps
Soft volume update
Individual channel and master gain/attenuation plus channel trim (-10 dB to +10 dB)
Up to 10 independent 32-bit user programmable biquads (EQ) per channel
Bass/treble tone control
Pre and post EQ full 8-channel input mix on all 8 channels
Dual independent limiters/compressors
Dynamic range compression
Automode™:5-band graphic EQ32 preset EQ curves (rock, jazz, pop, etc.)Automatic volume controlled loudness5.1 to 2-channel downmixSimultaneous 5.1-
and 2-channel downmix outputs3 preset volume curves2 preset anti-clipping modesPreset movie nighttime listening modePreset TV channel/commercial
AGC mode5.1, 2.1 bass management configurations8 preset crossover filters
Individual channel and master soft/hard mute
Automatic zero-detect and invalid input mute
Automatic invalid input detect mute
Advanced PopFree operation
Advanced AM interference frequency switching and noise suppression modes
I2S output channel mapping function
Independent channel volume and DSP bypass
Channel mapping of any input to any processing/DDX® channel
DC blocking selectable high-pass filter
Selectable per-channel DDX® damped ternary or binary PWM output
Max power correction for lower full-power THD
Variable per channel DDX® output delay control
192 kHz internal processing sample rate, 24-bit to 36-bit precision
主板参数:
功放部分: STA309(8通道DDX驱动), STA510F(输入12-44V 单IC可输出200W功率)
按键LCD,及杂项处理:STM32F103C8T6
音频输入: PCM1808*2 (模拟), PCM2706(USB)
2安时PCB,设计功率部分均按10A以上电流设计,按36V输入,输出2-300W应该没问题.
上图:
丝印图
TOP层:
BOT层:
成品图:
功放IC STA309A STA510F 资料:
PCB清楚PDF:
原理图:
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