Can I use AD8048 to  amplify  the signal from 500mV  to  4V       ??                                                                                                                                                                                                                              

Parents Reply Children
  • 0
    •  Analog Employees 
    on Mar 27, 2019 6:35 PM in reply to liyinglan

    Hi liyinglan,

    It is recommended to have the input current go to the inverting pin of AD8048, this way, you may set the compliance voltage on the non inverting pin of AD8048 making it a fixed value.
    You may also set the gain by increasing the Rf value, but take note that the iDAC also has an
    output capacitance and increasing Rf may limit your bandwidth.

    It is not advisable to have the input current go to the non inverting pin of an amplifier(AD8048) with a parallel
    resistor to generate a voltage drop. Since, increasing the input current may easily cause the voltage drop on that resistor exceed the compliance voltage of the DAC.

    If you want a positive voltage from AD8048, you can have the output of AD8048 followed by a single-ended to differential ended driver and interchange the output pins going to the ADC or to the next stage of your system.

    Hope this answers your question.

    Thanks liyinglan

    Best Regards,