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Old 1st May 2002, 11:19 PM   #1
tiroth is offline tiroth  United States
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Default DAC power supply Qs

Consider a current DAC IC which is powered by a dedicated low noise regulator, e.g. LT1762 at 20uV RMS noise from 10-100kHz.

Q1:
Current draw is from 12mA to a max of 17mA, and an additional ~2.7V reference voltage is required for the virtual ground. My first thought is to use a string of LEDs to achieve the reference; any thoughts on this? It seems wasteful to have an IC voltage reference for this task, especially since LEDs are reputed to be "quiet". Only 1mA is required into the DAC.

Q2:
Would it make sense to use a bleeder resistor to help even out the current demands? I'm worried about adding noise to the PSU, but a bleeder resistor sounds like a good idea.

Thanks for any input!
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Old 2nd May 2002, 03:01 AM   #2
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I use LEDs all the time. Cheap, quiet, and they let you know when you hook it up wrong.

Jocko
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Old 3rd May 2002, 04:59 PM   #3
tiroth is offline tiroth  United States
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Thanks!
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