Can I use AD8048 to amplify the signal from 500mV to 4V ??
You can set AD8048's gain to 8.Please make sure to limit your Rf value at 200ohm to 250 ohm and adjust Rg accordinglyto ensure optimum performance of AD8048.
Hope this answers your question liyinglan.
HI，I want the positive voltage from AD8048. I want amplify the signal from AD9748 and its datasheet also suggests AD8048. However, according to the schemic in the datasheet suggestions, it is the invert output.
Can you give me some suggestions?
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 parallelresistor 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.