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All,
Thanks for all the posts. This turned out to be a grounding issues. When I connected my daughter board ground directly to my external system ground the problem was resolved!
-MrBlue
1.) Here is the how the POT is being used:
Vin is a sine wave with a peak-to-peak voltage of 3.3V. The digital POT is programmed for 1k. Measuring the DC resistance across the POT shows 1k and all is well at DC. Vout then goes to our analog signal chain that includes amplification and...
Hello everyone!
1.) I am using a digital potentiometer (POT) in my project and having a problem with the waveform being distorted through he part. But before I do anything I set the digital POT to ~1k and I measure the resistance through the POT with my multimeter and I measure about 1k. This...
Hello everyone!
While doing electrostatic discharge (ESD) testing, it seems that noise is coupling into the MR pin
of the TPS3823 causing my microcontroller to be reset. I took a 0.22 uF capacitor and soldered this between pins 3 (MR) and 2 (GND) and now I am not seeing the unexpected resets...
All,
I have an application where I will be receiving in a ground reference and two other analog signals that I am calling “Analog Ground and Signals” in the images below (left and green.) One of the pins of this connector goes directly to my analog ground reference plane (AGND).
Next I have...
Hello FvM,
What parameter are you looking at to know the recovery delay?
Datasheet here:
https://optoelectronics.liteon.com/upload/download/DS-70-96-0016/LTV-8X7%20series%20201610%20.pdf
I am seeing about a 35 uS delay on the waveform on my scope.
The datasheet shows a response time of 4...
Hello Klaus,
This is the connection through the photocoupler:
This is output of the photocoupler to our comparator:
The blue trace in the previous post is the measurement across R421 (1O OHM) with a differential probe when the high voltage lines (HV_P and HV_N are shunted to ground.)
The...
Hello everyone!
There is a photocoupler (LTV-817) that I am using that is seeing a power glitch (~1 microsecond) and it seems to take a long time for the photocoupler to recover (~35 microseconds).
The blue trace is the power glitch that I am seeing and the yellow trace is the "output" of...
If I am using an instrumentation amplifier such as the AD8421 in what situations can I make an assumption of a virtual short across the input terminals of the amplifier? For example will the + terminal be ground?
https://www.analog.com/media/en/technical-documentation/data-sheets/AD8421.pdf...
Thanks for the posts everyone. A follow-up to what BradtheRad posted.
My follow-up question is that if Vout is a percentage of Vin how do I know what this percentage is? Do you mean the transfer function, i.e. Vout / Vin ?
For example, if I capture some data for Vin and Vout should the ratio...
In the attached image I am showing a voltage divider with the values of 50M (fixed) , 4.7k (fixed) and an unknown impedance Z.
Is it possible to calculate the value Z only using Vin, 50M and the 4.7k without using Vout directly?
I am looking for a simplified equation for Z that doesn't...
Hello Brad thank you for the post to my message.
The text goes into a brief description of what the circuit can do but doesn't describe in detail. For example, the circuit can control the drive current, there is a current limit and a compensation for the loop , etc.
I want to be able to do...
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