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zero offset DAC

Claudio Caprari
Prodigy 30 points

Hi guys, 

I'm developing a new device (weather station) where i have to collect some data from different sensors (PT100, ANEMOMETER, SOLAR RADIATION SENSOR and other).

My board once has collected these data, have to comunicate it to a data logger via RS485 or trough a 0 to 5V analog output.

The 12 bit DAC of the microcontroller has an 1,2 mV offset and a drift not suitable for this application.

Could you suggest me a 12 or 16 bit DAC (ultra low power, SPI) in order to have more precision than now.

(The DAC output is amplified by an OP.AMP. rail to rail dual power supply).

I found some TI P/N , but i have not been able to obtain the offset data from the data-sheet   :-(

Target price from 0 to 10$ for 1Ku.

Hope every thing is clear.

Thanks

Claudio

  • 0
    TI__Mastermind 42163 points

    Hi Claudio, 

    Are you actually concerned about offset, or zero code error? Offset is typically something that can be calibrated out of the system. Zero code error is an inherent error to the output buffer of a unipolar DAC not having enough headroom at zero code. If you want to minimize zero code error you need a DAC with a negative rail. 

    Best,

    Katlynne Jones