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INA 333 Dual Supply

asilva
Prodigy 40 points
Other Parts Discussed in Thread: INA333, TINA-TI

Hi,

I have an INA333, suplyed +3v3 and -2v5. VRef is to GND. Output is 10K to GND. Gain=1 (RG=ing.). The input is an Sinusoidal 0.1Vpkpk 750HZ, from an current clamp.

I tried, to connect the differential input lines to gnd, using 43K and 10K, now there is no Resistor. the VCM is GND.

Don't matters the configuration... the output seems to be satured ( I get an rectagular ou noisy output). 

Something is wrong, but I can´t figure it out. Can anyone give a tip?

thx

 

  • 0
    TI__Mastermind 25805 points

    Hello,

    The maximum supply voltage for the INA333 is 5.5V. By connecting the device to +3.3V and -2.5V, you are violating this specification because the difference in supply voltages is 5.8V. Therefore my first recommendation is to obtain a new device and power it with +/-2.5V supplies.

    Secondly, I recommend removing the device from your application and applying a known waveform to the inputs and then observing the output. You could connect Vin- to ground, apply a sine wave to Vin+, and observe the output. I have attached a TINA simulation depicting the idea. You will need TINA-TI to open the file. TINA-TI can be downloaded from www.ti.com/tina-ti. Once you verify that the device is operating appropriately you can then place it in your application and observe its behavior.

    Silva.TSC