Near perfect accuracy 16bit DAC idea

[tschrama]

Hi peranders,

from what I read in most 96/24 datasheets is that those DAC chips are actually not that good in converting 16bit data...especially looking at their -60dB distortion figures.. only the expensive onces seem to it propperly...

 

[Bernhard]

Pity I do not have the equipment for doing that, and no programming skills also.

 

[till]

30MIPS is enough? the chip is avaiable in DIP package.

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2032&param=en505549

 

[Bernhard]

From BB DAC8580 datasheet:

Spurious free dynamic range -100dB ( software calibrated )

Software calibration requires the user to calibrate the linearity error using a precision digitizer and provide the DAC inputs from a lookup table

 

[Bernhard]

Re: Re: Let me know what you think

This 'method' does not even qualifiy for 'Nice Try'.

You think you're clever, do you...

 

[ezkcdude]

I think the Lavry DA2002 works along similar lines with calibration.

From a 2004 Stereophile review:

The key to the DA2002's D/A conversion is actually buried beneath a power resistor. Rather than use an off-the-shelf DAC part, Dan Lavry uses a custom-made network of laser-trimmed thin-film resistors; the big resistor acts as an oven, heating the network to its working temperature. Each time the DA1002 is powered up, this network is calibrated using the AD7538 DACs and multiplexer chips, using, I imagine, data stored in the adjacent EEPROM chip.

 

[Gorilla]

This procedure could be used to eliminate distortion in non feedback amplifiers.

What your doing is feedback 😎. Abet by hand, but you are measuring your output to adjust your input.

Finally, I too, highly doubt such measurements will be accurate over time or with time varying signals. Would be better off just to buy a more accurate DAC.