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DRV425: DRV425

Dmitry Blokhin1
Prodigy 40 points
Part Number: DRV425

Hello, I found the following article from 2018 (in attachment) regarding the behavior of DRV425 chips.
I am interested in the problem illustrated in Figure 1. We have a fairly large number of such chips and after examining some of them, I could not find a peaks in the received signal graph (like blue line in Figure 1). Could you please comment on this issue? Is it necessary to check all the chips for this behavior? This problem can be critical for our application. Perhaps since this article came out, you have managed to investigate the problem (at least the authors claim to have contacted the manufacturer). Perhaps you can also comment on temperature stability? Can the signal really behave as shown in Figure 4?

Thank you for your help.

testing_and_application_DRV425_sensor.pdf

  • 0
    TI__Mastermind 28610 points

    Dmitry,

    I have not found the issue in the devices I have looked at but I did not look to the levels seen in the paper.  They mentioned 10% to 20% of there device showed this. Here are a couple of mitigating items below.  Do your measurements have the ability to see this issue if they were to get a device like this?

    I would make sure your power supply is good as I did not investigate what was used to supply the power.  The DRV425 has a PSRR that is about 2µT/1.5V as seen in the datasheet plot.  If the supply has anything moving from one state to another this could account for this.  The reason I think that the power supply is the issue is because they mention that it not the same behavior as they change the power supply voltage and there is no correlation between the level of the voltage and more or less "strange behavior".

    As for the drift the value of 5nT/°C is typical.  The histogram (figure 5) in datasheet shows a distribution and figure 4 shows typical drift of some devices.

  • 0 in reply to Javier Contreras4
    Prodigy 40 points

    Thank you for answer!

    I only had the opportunity to test 20 sensors and none showed similar behavior.

    Thank you for your advice, if these effects are found in the future, then we will analyze the power supply first.