INA321 rail

Juergen Schramek

Other Parts Discussed in Thread: INA321

we are using ina321 for lowside current measurement ( 3.0V supply, Gain 5, ref and Vin- connected to Gnd). With values greater than 0.5V on Vin+ we geht Vout 3.0V instead 2,5V. What could be the reason.

over 8 years ago

0 Deepak%20murali over 8 years ago

Expert 1095 points

Hi,

In the data sheet (www.ti.com/.../ina321.pdf), page 3, it is given that min value of input common mode voltage is 0.35. In your case, common mode voltage appears to be (0+0.5)/2= 0.25 and this is less than 0.35 V.

0 Juergen Schramek over 8 years ago in reply to Deepak%20murali

Prodigy 150 points

Thank you for your answer. We devides the input voltage by two and increased the gain from 5 to 10. Now it is Working.

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INA321 rail