DAC CS8416+AD1853

p1p4 · 28th October 2011, 01:13 PM

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

kimk · 10:33 AM

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..

p1p4 · 29th October 2011, 07:06 PM

I try it, without change. It's still noisy :/

kimk · 08:16 PM

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..?

kimk · 3rd November 2011, 11:33 AM

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..

p1p4 · 3rd November 2011, 08:05 PM

new knowledge. I tried to disconnect all power supplies besides Analog 5V. No changes - still noisy

Is it possible AD1853 is demaged ?

kimk · 4th November 2011, 05:46 PM

可能是I/V,LPF引起的?

p1p4 · 4th November 2011, 06:09 PM

sorry, i don't know what do you mean I/V LPF. I must use google translator..Can you please write in English, please ?

kimk · 4th November 2011, 06:27 PM

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..

p1p4 · 4th November 2011, 07:08 PM

yes, i used output buffers and LP filters from recommended circuit from datasheet AD1853. Outputs filt. + buff. without input signal are noise-free.

29th October 2011, 10:31 AM	#2
kimk diyAudio Member Join Date: Apr 2009	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.

29th October 2011, 07:59 PM	#4
kimk diyAudio Member Join Date: Apr 2009	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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29th October 2011, 07:06 PM	#3
p1p4 diyAudio Member Join Date: Oct 2011 Location: Prague	I try it, without change. It's still noisy :/

3rd November 2011, 11:33 AM	#5
kimk diyAudio Member Join Date: Apr 2009	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..

3rd November 2011, 08:05 PM	#6
p1p4 diyAudio Member Join Date: Oct 2011 Location: Prague	new knowledge. I tried to disconnect all power supplies besides Analog 5V. No changes - still noisy Is it possible AD1853 is demaged ?

4th November 2011, 05:46 PM	#7
kimk diyAudio Member Join Date: Apr 2009	可能是I/V,LPF引起的?

4th November 2011, 06:09 PM	#8
p1p4 diyAudio Member Join Date: Oct 2011 Location: Prague	sorry, i don't know what do you mean I/V LPF. I must use google translator..Can you please write in English, please ?

4th November 2011, 06:27 PM	#9
kimk diyAudio Member Join Date: Apr 2009	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..

4th November 2011, 07:08 PM	#10
p1p4 diyAudio Member Join Date: Oct 2011 Location: Prague	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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