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What code should be used for 8 bit current mode DAC?

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wany

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About current mode DAC

i will do a 8bit curren mode DAC. what kind of code should i use. is it binary or thermometer. Thank you !
 

jlee

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Re: About current mode DAC

It depends on your spec. The differences between two are mainly:

Binary code: Smaller area(no decoder and few switches), worse DNL, same INL.

Thermometer/Unit-element code: More area(needs decoder and much more switches), better DNL, same INL.

As a tradeoff, most people use a mixture of both. MSB bits are in thermometer code, LSB bits are in Binary code.

I read a very good paper about this topic before, it is a reference in Berkeley's EE247 ADC class. Highly recommend!!!
 

    wany

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omsi

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About current mode DAC

Binary
 

    wany

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wany

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Re: About current mode DAC

thank you jlee and omis .But omis why do you affirm to use binary? The sample rate of the DAC is 100MHz.
 

yaxazaa

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Re: About current mode DAC

segmentation may be better.™
 

waosai

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About current mode DAC

generally speaking, thermometer code is used when bit<=8bit while segmentation is used when bit >8bit
 

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