ADA4841-2 OR ADA4075-2 are OK for this.
Hello Richie,
The problem is that you are exceeding the input voltage range of the ADA4841-2, which is on a +5V supply is -0.1V to 4V. If you want to use the ADA4841-2 to buffer the reference you’ll need to increase the power supply to at least 1V above…
Yigal,
If you go to the product page for the ADA4841, and download the spice model, it has the text labeling I showed earlier.
For Orcad/PSpice, I usually copy a symbol, rename it to ADA4841 or whateverk, and then have the model line point to
ADA4841…
My customer received the evaluation board at the beginning of the week and he performed several measures on it with the AD8065 mounted on the evaluation board and with the ADA4841.
Here are the results:
Fe = 384 kHz
F = 95 kHz
1) AD5452 + ADA4841…
Hi Jerad,
I would recommend the ADA4841-1, -2 (single and dual version) in the low voltage application that you are discussing; it is spec'd down to 2.7 V. The ADA4841 has half the Input Noise (2.1 nV/rtHz) and is lower power than the other parts that…
The data sheet states the reference output current is 100nA. However on the example circuit (figure 90) REFIO is loaded with two ADA4841-2 inputs each one with 3uA (typ) to 5.3uA (max). Is it safe using this example circuit as is?
Hi, Jay and Scott,
I applied your suggestions and both methods can work in my side.
But seems ADA4841-2's noise plot has not displayed the 1/f noise.
BR,
David
Thanks YiZ for the comments. On your advice, I decided to utilize a differential output structure. Instead of the recommended ADA4841-2 dual opamp package, I opted for the ADA4940 that I mentioned in my first option.
Hi,
well seen, Harry, that the input voltage of the ADA4841 is beyond the limits.
As 4.096 V is just marginal too high and the thread is not marked as answered, I want to suggest a few more tips
that Richie could try:
I have asked a related question here in ADC section: Unstable, voltage reference of AD7682/AD7689
But I think it may be more appropriate to put the question here.
I am using ADA4841 to buffer a voltage reference. The ADA4841 is powered with +5V and…