Other Parts Discussed in Thread: INA296B, INA296A
Tool/software:
Hello everyone,
I'm looking to measure AC current and observe its frequency characteristics up to 1MHz.
I've chosen the INA293 for this task, but as a beginner with little experience, I have three questions I'd like to ask:
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1. The slew rate is specified as 2.5V/μs. I understand this 2.5V refers to the change in output voltage. However, I'm worried this might be too low to follow a 1MHz signal, and I'm concerned I might be misunderstanding something. Am I correct in thinking this refers to the change in output voltage, not the change in Vsense?
2. From section 7.3.1.1 and Figure 7.1 in the datasheet, I've gathered that the bandwidth depends on Vsense, and a relatively large output voltage is needed for 1MHz bandwidth. Since I want to measure current in the 1MHz range, I tried to select a resistor that would fit within the 1MHz bandwidth range in Figure 7.1. I thought about using the method of replacing the Vsn part in Equation 3 with the minimum output voltage value that can achieve 1MHz bandwidth, as read from Figure 7.1, to determine the resistance value. Is this approach appropriate?
3. Could you please provide the specific output voltage values at which INA293x1, INA293x2, and INA293x3 reach the 1MHz bandwidth in the graph of Figure 7.1?
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The AC current I want to measure has a maximum value of 1A. Ideally, I'd like to be able to measure down to about 1mA at the minimum.
If there are any other ICs that might be better suited for this, I'd really appreciate your advice.
Best regards,
Yohzan.