DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 187 - diyAudio
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Old 8th June 2012, 02:40 PM   #1861
erin is offline erin  Australia
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The cs8416 datasheet clearly says you can use a ttl or cmos input
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Old 8th June 2012, 05:32 PM   #1862
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Click the image to open in full size.

What is this chip?
It can play 24bit/192kHz so it can not be AK4393.

Fake AK4393, or AK4396 with wrong label?
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Old 8th June 2012, 08:14 PM   #1863
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In terms of PSU upgrades, one very simple thing I did was to remove the link from the +12V of the op-amp supply that feeds the A+5V and A+3.3V regulators and add in a separate +9V regulated supply, mimicking the other feed to the D+3.3 supply. It was easy to do as I had used two transformers to get the 15-0-15 & 0-9 feeds and there was a spare 0-9 feed available. You just need to cut one track and attach the new supply. Without this mod the +Ve regulator of the op-amp supply was getting overly hot.
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Old 9th June 2012, 01:36 PM   #1864
fulvio is offline fulvio  Italy
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Quote:
Originally Posted by erin View Post
The cs8416 datasheet clearly says you can use a ttl or cmos input
Sorry, but is the AK4396 that has selectable TTL or CMOS input level (depending on pin 15 status); for CS4816 they say only:
" The CS8416 receiver input pins are not RS-422
compliant; the receiver input absolute maximum
voltage range is 12 V for the CS8413/14 and
-0.3 V to VL + 0.3 V for the CS8416"
(from AN339, Cirrus Logic Application Note)
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Old 9th June 2012, 01:58 PM   #1865
erin is offline erin  Australia
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Quote:
Originally Posted by fulvio View Post
Sorry, but is the AK4396 that has selectable TTL or CMOS input level (depending on pin 15 status); for CS4816 they say only:
" The CS8416 receiver input pins are not RS-422
compliant; the receiver input absolute maximum
voltage range is 12 V for the CS8413/14 and
-0.3 V to VL + 0.3 V for the CS8416"
(from AN339, Cirrus Logic Application Note)
I am talking about the cs8416. See the attached grab from the datasheet.
TTL input is ok
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File Type: png Screenshot_2012-06-09-11-54-08.png (72.9 KB, 679 views)
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Old 9th June 2012, 02:03 PM   #1866
erin is offline erin  Australia
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Quote:
Originally Posted by tamphist View Post

What is this chip?
It can play 24bit/192kHz so it can not be AK4393.

Fake AK4393, or AK4396 with wrong label?
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Old 9th June 2012, 04:47 PM   #1867
fulvio is offline fulvio  Italy
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Quote:
Originally Posted by erin View Post
I am talking about the cs8416. See the attached grab from the datasheet.
TTL input is ok
It is right, but only if VL (pin 21) is held at 5V; in Absolute Maximum Ratings they clearly specify: Vin MAX = VL +0.3.

In my MINI2496 board VL is held at 3.3 V.
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Old 9th June 2012, 07:14 PM   #1868
ch33ta is offline ch33ta  Croatia
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Quote:
Originally Posted by fulvio View Post
It is right, but only if VL (pin 21) is held at 5V; in Absolute Maximum Ratings they clearly specify: Vin MAX = VL +0.3.

In my MINI2496 board VL is held at 3.3 V.
Have to agree with fulvio on this one...
I read over the CS8416 datasheet countless times, and on page 27 you'll find this;

"The input voltage range for the input multiplexer is set by the I/O power supply pin, VL. The input voltage
of the RXP[7:0] and RXN pins is also set by the level of VL. Input signals with voltage levels above VL or
below DGND may degrade performance or damage the part.
"

So, it would be wise to keep SPDIF input voltage below the VL. Doesn't mean it won't work, but try it at your own risk...
Or you can put a simple resistor voltage divider, but it may not be the best solution...
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Old 9th June 2012, 08:50 PM   #1869
fulvio is offline fulvio  Italy
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Quote:
Originally Posted by ch33ta View Post
Or you can put a simple resistor voltage divider, but it may not be the best solution...
Thanks, I think I've fixed the problem using a compensated divider, that is a 33 pF capacitor in // with the series resistor of the divider.
In this way I can't see any difference in rise time before and after the divider.
By the way, I'm using my computer as a SPDIF source, and a 26LS32 balanced line receiver just in front of the SPDIF input of the board; in this way, without any transformer, I get more than 102 dB of S/N (20 Hz - 50 KHz band) at the audio output of the DAC board.
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Old 13th June 2012, 03:56 AM   #1870
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What do you guys think using this regulator...
GB for Salas SSHV2 regulator

hooked up like this picture? Will this have any improvements?
http://www.polkaudio.com/forums/atta...1&d=1333405930

Also using a large ferrite ring in socket wiring within the case, would that help?
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