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Original question:

INA333: INA333 I/P Offset Voltage Simulation

INA350: Converting 50mV to 500mV to 0V to 5 V.

NISHANTKUMAR SHARMA
Prodigy 10 points
Part Number: INA350
Other Parts Discussed in Thread: TL431, TLV9061

Tool/software:

I have a sensor with an output range of 50mV to 500mV relative to ground. I need to convert this signal to a 0-5V range (or another suitable range) for measurement with a 10-bit ADC. I'm considering using the INA350 current sense amplifier and have installed the Analog Engineer's Tool.

My current setup:

  • Vs+ = 5V
  • Vs- = 0V
  • Gain = 10
  • Vref = 0V

Questions:

  1. Is this configuration appropriate for my application?
  2. How should I handle the common-mode voltage (Vcm) in this circuit, given that my sensor output is ground-referenced?
  3. Can you provide a basic circuit diagram for connecting the INA350 in this application?
  4. Are there any additional considerations or components I should include for optimal performance?
  5. Can I use the TL431 for providing a reference voltage in this circuit? If so, how should it be implemented?

I'm not an analog engineer, so I'd appreciate any guidance on implementing this circuit correctly.

  • 0
    TI__Guru**** 166636 points

    Hello NISHANTKUMAR SHARMA, welcome to the e2e forums

    Gain is not actually 10; (5V-0V)/(500mV-50mV) = 100/9 = 11.111.  However gain can be 10; where 50mV to 500mV becomes 0.5V to 5V

    You can use INA350 for this gain of 10. You could also use a single standard op amp in a difference amplifier setup.  

    1) Yes for gain of 10 shown above.

    2) Connect Vref to your sensor ground lead.

    3) It is just as you summarized and GS = ground

    4) See 9.4.2 Layout Example (make sure GS = GND)

    5) I don't see why TL431 would be helpful here.

  • 0 in reply to Ron Michallick
    Prodigy 10 points

    Thank You Ron for Prompt Reply.

    When i tried to simulate into PSpic,provide 54mV in Vin+  Output Should be 0.5V but its just 83.61mV. I think its because Vcm. But if I need to change Vcm here how can i get 0.5V in this Circuit. Can you help me with that?

  • +1 in reply to NISHANTKUMAR SHARMA
    TI__Guru**** 166636 points

    Nishantkumar,

    This could be the model's way to let you know that the setup is outside the VCM and VOUT range

    Input for [2.5V,0V] is not compatible with chart bellow.  I don't think INA350 is a good fit in this application. See a solution at bottom of post

    A single op amp such as TLV9061 or similar can do the application task,

    Gain is close to 10, 10.0027 typical.  C1 sets bandwidth.

  • 0 in reply to Ron Michallick
    Prodigy 10 points

    Thank You. Will now See as Milli Volts are coming from  Parallel plate Capacitance converted to volts. Simulation worked well.