I have a single-ended unipolar input signal of 0V to 5V (50 ohms source resistance) connected to the non-inverting input of the ADA4930-1.
The ADA4930-1 is powered by single-supply 5V and has input common-mode voltage range of 0.3V to 2.8V.
The AD9284 has a 1.2Vpp analog input range and requires Vcm of 1.4V.
According to page 22 of the ADA4930-1 datasheet, we can bias the amplifier inputs with resistors to bring the input signal to within the common-mode range.
However, I wasn't able to follow and obtain the correct resistor values to suit my application.
What are the suggested resistor values to meet the above requirements?
What will be the target gain of the application? I could help you compute for the right value of the resistors to use.
In my case, the target gain is about 0.3~0.4. Looking forward to your reply, i am very grateful for your help.
The ADA4930-1 is in single-ended-to-differential operation mode. And, it have 50 ohms source resistance.
The targeted gain would be 0.279.
There is no need to force the common mode voltage of the inputs since the signals are within the ICMVR of ADA4930. See below.