Hi,

I am attempting to use the AD825x devices as current sense and voltage sense instrumentation amplifiers in an analog control loop. I was unable to get the SPICE models for the AD825x to work with PSpice and LTSpice. While the circuit simulation was…

AD8250 has differential input impedance  of 5.3Gohms/ 0.5 pf.

I have input signal whose differential input impedance which is driving AD8250 is  10Mohms & 5pf.

My customer is saying that i may not be able to give differential signal to AD8250 directly…

• ### Spice Model of AD8251

Hi

I simulated the AD8251 in LTspice and found strange input bias current.

This part's specification of input bias current is 30nA max but it show a much bigger value.

Would you tell me the reason?

Hi,

I wonder if it's enough for AD8253/AD8251/AD8250 to output ±10V when it is supplied with a power of ±12V ?

Thanks.

• ### Varying input impedance of AD8251

I am using an AD8251 to measure the amplitude of an AC signal across a sense resistor.  The input impedance of the AD8251 is in parallel with my sense resistor.  Under normal operation, the circuit works great, but when I use large amplitude or high frequency…

• ### AD8251 Input Bias Current Model

Spec sheet for AD8251 cites nA input bias currents.

I have a rather simple AD8251 simulation running in LTspice (wrapping the AD model) and it is modeling ~4.5uA of input bias current.

Any suggestions?

• ### Input capacitance measurement for AD8251

Hi All,

I am going to use programmable gain amplifier AD8251 in a data acquisition system.

I want to know how to measure input impedance and capacitance of AD8251 when it present in circuit.

Please anybody suggest me as soon as possible.

Thanks,

• ### AD8251 differential output voltage calculation question

I would like to use the AD8251 in-amp in the same circuit configuration shown in figure 61 of its datasheet. I have two questions...

1. I can calculate the in amp and the level shift output voltage equations separately but am having trouble coming up…