Other Parts Discussed in Thread: TLV7042
Hi TI expert,
as shown below,What causes the red 2.8us noise in the following picture?
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Hello Gary,
Can you get a scope photo of the inputs at the same time? Preferably both inputs an the output on the same screen.
Do note that the LMV393 is not a rail-to-rail input device. The input limit is 0.7V below 3.3V, or 2.6V. So if there are any voltages greater than 2.6V on the inputs, there could be erroneous outputs.
Do you have a pull-up resistor anywhere? What is the output driving?
Gary
we have not seen a response on this post in a little while, so I will be closing the thread. if you have any further questions, please reply or start a new thread with your new question.
Thanks
Chuck
Hello Gary,
The "Glitch" just looks to be normal comparator "chatter" from a slow moving input signal. You do not have any hysteresis, so the output can "chatter" while the output moves through the threshold.
Please see this TI Design about Hysteresis:
Comparator with Hysteresis Reference Design
As an experiment, try adding a 100k to 470k resistor from the output to the positive input to add a little hysteresis.
Please see the following application note
Non-inverting comparator with hysteresis circuit (Rev. A)
You could also try using a TLV7042 which has built-in 10mV hysteresis.
Gary
we have not heard back on this thread in a little while so I will close it out. If you have any additional questions, please reply or open a new thread.
Thanks
Chuck