Reference of AD5542A in bipolar mode

Hi Richie,

For the power supply (VDD) it should be from 2.7V to 5.5V. For the voltage reference (REF) it should be from 2V to VDD(meaning any value from 2V up until to your working VDD).For the output voltage (VOUT) it will work from -VREF to VREF -1LSB.

If you want to work on +/-5V output, you may want to have your VDD to 5V, and VREF to 5V, so that you could have a working output voltage of -5V to 4.99V (5 - 1LSB)

Regards,

Mark

Hi Richie,

For the lower rail, you could reach the negative rail, in your case, of -5V. for the upper rail, the output canonly reach 1LSB lower than the maximum output. In your case of 5V, it could theoretically reach 4.999923707V (or 5Volts - 1LSB).

There is a BIPOLAR OUTPUT OPERATION section in page 16 of the data sheet for your reference on how the bipolar operation works. In choosing the opamp, there is an OUTPUT AMPLIFIER SELECTION section in page 17 for your guide on choosing a suitable amplifier.

Regards,

Mark

Very clear. Thanks Mark!

Could I ask one more question?

Is the DAC true rail-to-rail? If both VDD and VREF are 5V exactly, could the output export 5V or something like 4.8V max?

Regards

Richie