I recently bought the ADA4857-2 high speed opamp and the bare-board that allows me to prototype various circuits using the opamp. I want to create a circuit that converts the differential output coming from LTC5586 Zero IF IQ Demod board that I have…
You would at least need an amplifier with a THD of -72 dBc at fin= 5 MHz, a much faster op amp would do so. Here are the possible choices: LTC6268/LTC6269, and ADA4857. Take note that ADA4857 runs at 5V and LTC6268/9 can run at 3.3 V. Also, reconsider…
I am trying to Configure an ADA4857-2 as an Instrumentation amplifier and I have simulated the circuit in ADS using the model and it is working fine. Now that I am making the schematics,I have encountered two pins which I do not know how to use and they…
I am trying to use the ADA4857 to generate a circuit model of a state variable filter in order to compare with measured results. In our implementation, we are using a single supply (+5V/0) on the ADA4857. When using the pspice model of the ADA4857 in…
Here is the pertinent connection info:
From the model
*Node Assignments* Non-Inverting Input* | Inverting Input* | | Positive supply* | | | Negative supply* | | | | Output* | | | | | FB* | | | | | | PD* | | | | | | |.Subckt ADA4857 100 101 102 103 104…
We were using AD8620 Op Amp in our previous application but now want to use the ADA4857 op amp as integrator / charge amplifier. I have compared the following parameters of both the op amps
The node or pin assignment is in the ADA4857.cir like this one below.
Try to open the .cir file in the model editor or notepad.
The SPICE models for the ADA4817, ADA4857, and AD8045 are attached. I will follow up with the ADA4899.
I hope this helps.
Hello, What opamp do you recommend to use in Active filters Type C (G=+1) for high BW loop filter (0.001 ~ 10MHz) applications?ADA4857, AD8065, .. ?
I found these in ADA4861-3, which states that if PD function is not used, it is best to connect them to -VS (negative supply). I wonder whether this also applied to ADA4857-1.