This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TLV9064: Pyroelectric Infrared Radial Sensor Application

Part Number: TLV9064
Other Parts Discussed in Thread: LM324, TLV9002, TLV9004

Hi team,

Do you think TLV9064 can be used in Pyroelectric Infrared Radial Sensor Application? Typically it needs 2 amplifiers and 2 comparators. You can refer to below application circuit. 

Or you can refer to BD9251FV which is a Rohm device which does this function. 

Thanks!

George

  • Hi George,

    does this circuit work with the LM324? Is it tested?

    I would disconnect C2 from the -input of U1-A. This terminal of C2 should be connected to signal ground. And I would add hysteresis to the both comparators.

    Kai

  • Former Member
    0 Former Member

    Hi George,

    Thank you for your question.  Here are some of my thoughts and questions.  I would appreciate your help:

    1. What rail is being used in the design?  I see a 12V rail and the LM324 is a 30V part, but the the BD9251FV and TLV9064 are only 6V/5.5V parts, respectively.  So, depending on what the V+ voltage is, you may not be able to use the TLV9064 at all.

    2.  Is the BD9251FV the part currently in use?  Has the design worked before?

    3.  I am not quite sure what the customer's intention is with C2.  Could you please clarify this?  Is it supposed to be a filter to ground?

    4.  You can use an amplifier as a comparator, but it does not always give the best performance.  In this case, it might be better to use a dual channel amplifier and a dual comparator.  You may also look into hysteresis.

    5.  I think consideration needs to be given to cost.  If cost is an absolute priority, then the LM324 might be the best option.  The TLV9064 is in another type of cost range.  The TLV9002 may be a good consideration, given that it will still have better performance than the LM324, but better cost than the TLV9064.

    Please let me know what you think.

    Regards,

    Daniel

  • Hi Daniel,

    Thank you very much for the reply.

    Sorry for the misleading, I think you can forget the schematics, it's not what customer is using. BD9251FV is the device they are evaluating.

    Actually what I'm trying to do is find a better cost and similar performance replacement of BD9251FV. Also size matters, so I think a quad channel amplifier maybe a good choice, not only because of cost but also size.

    Apart from TLV9064 and LM324, what is the best we can offer for this application?

    Thanks,

    George

  • Hi George,

    I think the TLV9004 is a very good choice, as already mentioned by Daniel. But the TLV9004 can only handle a supply voltage of up to 5.5V.

    What supply voltage range do you need?

    Kai

  • Hi Kai,

    Thanks, 5V is OK.

    George

  • Then, I would go for the TLV9004 :-)

    Kai

  • Former Member
    0 Former Member in reply to George Zhao

    Hi George,

    I agree with Kai, the TLV9004 might be good to try here if you simply want to replace the BD9251FV.

    The comparator team will have some good suggestions in case you'd like to go the 2 amps + 2 comparators route.

    Regards,

    Daniel