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Old 4th September 2005, 07:39 PM   #1
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Default I/V - op amp offset influence on DAC performance ?

Hi,

most op amps including OPA627 have significant offset.
Does that degrade linearity of DAC chips like TDA1541 or other multibit chips ?
It should degrade R-2R DAC.
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Old 4th September 2005, 08:45 PM   #2
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Default Re: I/V - op amp offset influence on DAC performance ?

Quote:
Originally posted by Bernhard
Hi,

most op amps including OPA627 have significant offset.
Does that degrade linearity of DAC chips like TDA1541 or other multibit chips ?
It should degrade R-2R DAC.

Bernhard,

Significant offset? Surely not more then a couple of mV? I know DACs don't like offset at their current output (therefore one must be carefull using just an I/V resistor), but a few mV wouldn't matter I would think.

Jan Didden
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