DAC8820: DAC8820ICDBR

NAFISA A

Prodigy 60 points

Part Number: DAC8820

What is the purpose of Rofs pin? By using trim-pot with Rofs pin, can we control offset? Provide ur views.

over 3 years ago

0 Katlynne Jones over 3 years ago

TI__Mastermind 42273 points

Hello,

The Rofs is used to provide an offset if the DAC were to be operated with a bipolar output. By connecting Rofs to Vref, the DAC can generate voltages from -Vref to Vref as shown in the transfer function in the image.

The Rofs resistance is defined in the electrical characteristics table.

Please see this related post: https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/1085806/dac8820-dac8820icdbr

They were concerned about temperature compensation. All resistors in the DAC will see the same temperature effects and the transfer function will remain the same. That is the benefit of the matched Rofs and Rfb resistors. The RFB resistor connected to the output also senses/tracks any temperature effects at the output.

Best,

Katlynne Jones

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DAC8820: DAC8820ICDBR