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Old 28th October 2011, 01:13 PM   #1
p1p4 is offline p1p4  Czech Republic
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Post DAC CS8416+AD1853

Hello, first I'm new here and my english is bad..

But my problem : I built D/A converter with CS8416+AD183. Alfter started problem, he's functionally now, sound is very nice. But he produces noise, left chanel more. I don't know whats wrong. I did double layer PCB, separate analog and digital ground.

I have suspicion to power supply. I've used to digital power LM317 to 3,3 and 5V, ADP 3303-3,3 to 3,3V (low noise linear regulator form Analog devices) and for analog power the same ADP3303-05 for 5V. For output filter & buffers simply 7815/7915. Everywhere is quallity blocking cap.
What's wrong ? DAC plays nice, but the noise spoils him
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Old 29th October 2011, 10:31 AM   #2
kimk is offline kimk  China
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线路板上的R15应该在AD1853#28PIN附近接+5V DIG.. 而且所有IC每一个供电PIN应该有10UF或更大的退藕电容.. CS8416和AD1853的+5V DIG用磁珠电感隔离一下..AD1853的AGND与DGND要相连..

SL2插座增加一个AGND连接LPF的GND..

Last edited by kimk; 29th October 2011 at 10:33 AM.
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Old 29th October 2011, 07:06 PM   #3
p1p4 is offline p1p4  Czech Republic
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I try it, without change. It's still noisy :/
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Old 29th October 2011, 07:59 PM   #4
kimk is offline kimk  China
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Or, remove R1, then the CS8416 # 14PIN_NV/RERR directly connected to AD1853 # 23PIN_MUTE as squelch function use ..

其实,我不确定CS8416的NV/RERR是否是用来显示接收信号错误的功能,如果是,这个或许能做前面提到的那个静噪接法..

如果还没有用,或者你描述一下噪音是如何的..?

Last edited by kimk; 29th October 2011 at 08:16 PM.
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Old 3rd November 2011, 11:33 AM   #5
kimk is offline kimk  China
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抱歉楼主!

CS8416 # 14PIN_NV/RERR似乎只是S/PDIF专业应用部分AES3的版权检测控制输入端..
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Old 3rd November 2011, 08:05 PM   #6
p1p4 is offline p1p4  Czech Republic
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new knowledge. I tried to disconnect all power supplies besides Analog 5V. No changes - still noisy Is it possible AD1853 is demaged ?
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Old 4th November 2011, 05:46 PM   #7
kimk is offline kimk  China
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可能是I/V,LPF引起的?
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Old 4th November 2011, 06:09 PM   #8
p1p4 is offline p1p4  Czech Republic
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sorry, i don't know what do you mean I/V LPF. I must use google translator..Can you please write in English, please ?
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Old 4th November 2011, 06:27 PM   #9
kimk is offline kimk  China
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I / V is the current and voltage transformation, LPF is a low-pass filter ..

AD1853 analog output signal is current, you need to transform the voltage..
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Old 4th November 2011, 07:08 PM   #10
p1p4 is offline p1p4  Czech Republic
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yes, i used output buffers and LP filters from recommended circuit from datasheet AD1853. Outputs filt. + buff. without input signal are noise-free.
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