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Dither in modern DACs?
Old 2nd January 2019
  #1
Gear Maniac
 
amundsen's Avatar
 
🎧 15 years
Question Dither in modern DACs?

Hello,

I would like to know if current ADCs still add dither noise before the actual analog to digital conversion. Dither was mandatory in 16bit ladder ADCs but with current 24bit digitizing and oversampling, is it still used?

Of course dither is still used when converting to low-resolution encoding, but it's another matter.

Last edited by amundsen; 3rd January 2019 at 03:47 PM.. Reason: "DAC" used instead of "ADC"
Old 2nd January 2019
  #2
Lives for gear
 
JohnRoberts's Avatar
 
🎧 10 years
I believe the modern oversampling converters are self-dithered by their own input noise. They then apply noise shaping to this noise floor inside the digital domain for improved audio band dynamic range.

JR
Old 2nd January 2019
  #3
Lives for gear
 
Are you talking about analog to digital converters (ADCs) or digital to analog converters (DACs)?
Old 3rd January 2019 | Show parent
  #4
Gear Maniac
 
amundsen's Avatar
 
🎧 15 years
Thanks John Roberts.

Quote:
Originally Posted by DrewE ➑️
Are you talking about analog to digital converters (ADCs) or digital to analog converters (DACs)?
The original question was about ADCs but maybe this one is about John Robert's answer?
Old 3rd January 2019 | Show parent
  #5
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JohnRoberts's Avatar
 
🎧 10 years
Quote:
Originally Posted by amundsen ➑️
Thanks John Roberts.



The original question was about ADCs but maybe this one is about John Robert's answer?
Reread your original question... I ASSumed you were asking about ADC but your wording is a little unclear.

JR
Old 3rd January 2019 | Show parent
  #6
Gear Maniac
 
amundsen's Avatar
 
🎧 15 years
Quote:
Originally Posted by JohnRoberts ➑️
Reread your original question... I ASSumed you were asking about ADC but your wording is a little unclear.

JR
Oops... ...you're right. Corrected. Thanks.
Old 3rd January 2019
  #7
Gear Guru
 
tINY's Avatar
 
1 Review written
🎧 15 years

So it was ADC information you were after...

Most modern ADCs use a single-bit delta/sigma schemes and use multiple integrator stages to shape the noise instead of dither.

http://www.ti.com/lit/an/slyt423a/slyt423a.pdf




-tINY

Old 4th January 2019
  #8
Gear Maniac
 
amundsen's Avatar
 
🎧 15 years
Thanks tINY, very interesting note.
Old 6th January 2019
  #9
Lives for gear
 
Mylithra's Avatar
 
🎧 10 years
If I read that right, any noise generated by the process gets moved well above the 20K range then discarded. Cool read. Thanks Tiny.
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