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DAC3162: Ground connections and noise

Ian Biagioni
Prodigy 30 points
Part Number: DAC3162

Dear community,

I have seen that the DAC3162 has analog and digital supply pin but the ground pins are not differentiated. Is it better to connect them to analog or digital ground? And for the BIASJ pin, the ground should be the same of the GND pins or an analog ground is better being less noisy?

Another part of the design that I'm not sure of is concerning the output stage. The DAC output is DC-coupled to obtain a digital code wave with different amplitudes and 20 ns bit time. Should i refer this stage to the analog ground or digital ground? On the board there is an ADC too and I'm afraid that connecting the output stage of the DAC to the analog ground would disturb the ADC conversion.

Thanks for any advice or suggestion.

Regards,

Ian 

  • +1
    TI__Guru* 91947 points

    Ian,

    I would suggest using a single ground for both. The key to this is to use good partitioning of the circuits located around the DAC and ADC. Do not have high speed digital traces in the same area as the analog inputs or the clock inputs, route sensitive analog signals on the top layer and digital switching signals on the bottom layer, ect....

    See the attached document from more information regarding this.

    Regards,

    Jim

    7840.Schematic and Layout tips.ppt