Help me set up CS8416 in HW mode

ezkcdude · 29th April 2006, 11:34 PM

Hey, all. As a newbie, I'm asking for your help. I am designing my first DAC, and the first step for me was to figure out how to use CS8416 in hardware mode. My DAC will only have one SPDIF input, so there is no need (I hope) for any fancy switching or anything like that. I've attached a schematic, which was made as much as possible according to the data sheets for CS8416 and various Cirrus eval boards. If I set up the pins correctly, it should be set up to output I2S. I need help with the resistor values (R) for the outputs, because I'm not sure how you are supposed to choose those. If and when I get this part figured out, I will move on to the ASRC (AD1896) next. Please, any advice or help is greatly appreciated. My feelings will not be hurt

Also, since I have not had much electronics experience, please let me know how I can improve my schematic, if necessary. If I'm drawing something against conventions, I'd like to know, so I can fix it.

ezkcdude · 1st May 2006, 03:58 PM

Man, I got more responses to my cross-post at the headfi site. I'm surprised nobody had any opinions about my schematic. Since I uploaded that schematic, I found that the resistor values should be 100 Ohms, according to the CS8416 eval board data sheet.

rossl · 1st May 2006, 05:24 PM

It's probably not a good idea to load the RMCK with a 100 ohm resistor to ground. That is the clock output.

ezkcdude · 1st May 2006, 06:33 PM

Thanks. But what should I do with it, if it's not being used for anything? Should I just use a much higher value resistor, or maybe an RC?

rossl · 2nd May 2006, 01:54 PM

You don't need a resistor, you can let it float.

I you bring it out to a 4.7K resistor, now the load on the clock is less than a milliamp and you also have a nice pad to connect a scope probe to. if you need it later.

ezkcdude · 2nd May 2006, 02:24 PM

Quote:

Originally posted by rossl
You don't need a resistor, you can let it float.

I you bring it out to a 4.7K resistor, now the load on the clock is less than a milliamp and you also have a nice pad to connect a scope probe to. if you need it later.

So, just to be sure I understand, you're saying it is better to connect RMCK to ground through 4.7K, than to let it float?

rossl · 2nd May 2006, 10:08 PM

it's not better if you are confident that you don't need to look at it or use it for something.

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1st May 2006, 03:58 PM	#2
ezkcdude diyAudio Member Join Date: Dec 2005 Location: Atlanta	Man, I got more responses to my cross-post at the headfi site. I'm surprised nobody had any opinions about my schematic. Since I uploaded that schematic, I found that the resistor values should be 100 Ohms, according to the CS8416 eval board data sheet.

1st May 2006, 05:24 PM	#3
rossl diyAudio Member Join Date: Nov 2004 Location: Central Ohio	It's probably not a good idea to load the RMCK with a 100 ohm resistor to ground. That is the clock output.

1st May 2006, 06:33 PM	#4
ezkcdude diyAudio Member Join Date: Dec 2005 Location: Atlanta	Thanks. But what should I do with it, if it's not being used for anything? Should I just use a much higher value resistor, or maybe an RC?

2nd May 2006, 01:54 PM	#5
rossl diyAudio Member Join Date: Nov 2004 Location: Central Ohio	You don't need a resistor, you can let it float. I you bring it out to a 4.7K resistor, now the load on the clock is less than a milliamp and you also have a nice pad to connect a scope probe to. if you need it later.

2nd May 2006, 10:08 PM	#7
rossl diyAudio Member Join Date: Nov 2004 Location: Central Ohio	it's not better if you are confident that you don't need to look at it or use it for something.

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