Part Number: INA229
Tool/software:
Hi, I would like to get clarification on the minimum common mode voltage (Vcm) for the INA229. For my application, I am doing low-side sensing with the Vin- pin connected to ground, and I need to measure negative differential voltages (Vin+ < 0). My question is: what is the lowest voltage allowed for the Vin+ pin in my application? The spec sheet states a minimum Vcm of -0.3V, but I have seen different definitions of Vcm. One definition says Vcm is the average of Vin+ and Vin-, so for this definition the lowest allowed voltage at the Vin+ pin would be -0.6V (i.e., Vcm = (-0.6 + 0)/2 = -0.3V). But I have seen some other comments that make me think the lowest allowed voltage at the Vin+ pin would be -0.3V. Which of these is correct for my application?
