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…
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
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…
I am trying to do a PSPICE simulation for ADA 4857. I imported the .cir file for this part into orcad. I am not able to tell what each pin is. Can someone help me with this?
The AD4857-1 datasheet specifies that:
"THE EXPOSED PAD MAY BE CONNECTED TO GND OR VS."
Is this +VS or -VS?
I have split supplies.
I am running a SPICE simulation (in Altium Designer) using the supplied model for the ADA4857. If I load the output of the amplifier with anything less than 1Meg or so the output sags very significantly - but I get reasonable performance with a 1Meg load…
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 build a Howland current source that can pump bi-directional current up to 1MHz, with maximum output swing to +-10V. The schematic simulated using LTSpice is shown below.
This circuit is also being used in analog dialogue 2009, entitled as,
Hi, I do not want to use the power down option of ADA4857-1, so is it ok to left it unconnected (NC) ? or should I pull down this pin to GNDA or connect directly to -VS?