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TLV274: if VOL will be less than 0.1V when IOH is about 3mA.

Part Number: TLV274

Hi, Team

My customer wants to know if VOL will be less than 0.1V when IOH is about 3mA.

So my customer asked "what the worst values of VOH and VOL are when VDD= single 15V, TA=Full range, IOH=-1mA and 1mA respectively". 

The VOH/IOH and VOL/IOL figure in the datasheet only shows when VDD below and equal 10V. 

And also when IOH is small, it's difficult to distinguish the value of VOH and VOL. 

Could you kindly tell me how to figure out  the worst values of VOH and VOL in the conditions mentioned above? Thanks.

  • Former Member
    0 Former Member

    Hello Hung Ching,

    I will first address the customer's direct quote, "what the worst values of VOH and VOL are when VDD= single 15V, TA=Full range, IOH=-1mA and 1mA respectively?"

    Unfortunately, the data sheet does not give us the values at the maximum supply of 16V.  However, I think the given specifications are still useful.  If we look at the values for 2.7V, 5V, and 10V supplies, you will see that the values go closer to the rails as the supply voltage increases.  I see no reason to think that this trend will not continue as you reach even higher supply voltage levels.  The only way this might be affected, I would think, is if the device has some type of alternative output stage for different output voltage levels or something similar.  However, I doubt this is the case, but am checking with a colleague just to be sure as I cannot really tell from the data sheet alone.

    That being said, the minimum VOH level at 1mA of output across temperature is 100mV from the rail at Vsupply = 10V.  Similarly, the maximum VOL across temperature at Vsupply = 10V is 100mV from the rail.  Thus, I think it is reasonable to think that the minimum VOH and maximum VOL will stay within 100mV of the rail across temperature for Vsupply = 10V and 1mA of output current.  However, I do not think this will be the case for 3mA of ouput based upon the specification at 5mA of output and figures 3 - 8 of the datasheet.

    Please let me know if you need any further assistance.

    Regards,

    Daniel Miller 

  • Former Member
    0 Former Member in reply to Former Member

    Hung Ching,

    One more thing.  If the customer would like a device where the performance is better covered by the data sheet for a 15V supply, please let me know and I will work to see what alternatives we can offer.

    Regards,

    Daniel Miller

  • Former Member
    0 Former Member

    Hello Hung Ching,

    I have not heard back from you yet.  Please let me know if the provided explanation is acceptable and whether the customer needs help picking a new part.

    I have further looked into the issue, in the meantime, but have not been able to determine how the amplifier's performance will be affected at higher supply voltage levels.  If the customer is concerned with the output current, I would recommend switching to a different device that has its performance characterized at a higher supply voltage.

    Regards,

    Daniel Miller

  • Hi Daniel 

    Sorry for the late reply.

    It seems it's enough information for the customer for now.

    I forwarded the information you provided to the customer, and the customer asked "so when Vsupply = 15V and 1mA of output current across temperature, theoretically maximum VOL will also stay within 100mV of the rail".

    According to your information mentioned below, I think it's not the problem.

    "I think it is reasonable to think that the minimum VOH and maximum VOL will stay within 100mV of the rail across temperature for Vsupply = 10V and 1mA of output current."

  • Former Member
    0 Former Member in reply to Hung Ching Hsu

    Hello Hung Ching,

    Very well.  I would recommend the customer test the performance in their system since operation at this supply range is not covered in the data sheet.  If the customer needs help picking an alternative, please let me know.

    Regards,

    Daniel