Very low noise DAC

DMW over 1 year ago

Hi,

I need a low noise DAC for a precision low-frequency (<500Hz) application, resolution >= 16 bits, 3.3V, SPI

I am thinking of using the LTC6655BHMS8-2.5 as a reference, but trying to find a DAC that doesn't swamp its 400nVpp low frequency (0.1-10Hz) noise is difficult.

In your product selector guide the LTC2641 is shown as a low noise DAC but its datasheet doesn't provide much information on noise, what is its 0.1-10Hz peak-peak noise?

Is there a lower noise output part that you can suggest?

(The AD5780 has 1.1uVpp typical)

Many thanks,

Dominic

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DMW Apr 3, 2020 in reply to isantos +1 verified

Thanks for the reply. The AD5791 is 1.1uV i.e. much worse than AD5512 The AD5541/AD5542 seem to also be a possible choice Thanks

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0 DMW on Apr 2, 2020 11:03 AM

I see the AD5512 (134uVpp) is a good choice but I cant compare its performance vs LTC2641 as the LTC datasheet is missing this information, any chance you can please post it?

Many thanks

Dominic
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0 isantos

on Apr 3, 2020 7:17 AM in reply to DMW
Hi Dominic,

Please have a look at AD5791, a 20-bit part with 0.1-10Hz noise similar to AD5780.

The EVB of this part has a daughter board option which uses LTC6655 and LTZ1000.

https://www.analog.com/media/en/technical-documentation/user-guides/EVAL-AD5791SDZ-UG-1152.pdf

Cheers,

Ivan
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+1 DMW on Apr 3, 2020 8:07 AM in reply to isantos

Thanks for the reply.

The AD5791 is 1.1uV i.e. much worse than AD5512
The AD5541/AD5542 seem to also be a possible choice

Thanks
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+1 DMW on Apr 3, 2020 8:07 AM in reply to isantos

Thanks for the reply.

The AD5791 is 1.1uV i.e. much worse than AD5512
The AD5541/AD5542 seem to also be a possible choice

Thanks
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