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INA282: Question on BW of Current Sensor

Part Number: INA282
Other Parts Discussed in Thread: INA201, INA193, INA226, INA220

Hi team,

I have questions on BW of current sensor.

1. INA282 has 10kHz of BW, which is quite narrow when it's compared to other INA parts such as INA193 and INA201 (300kHz and 500kHz each). Does this mean INA282 would show much slower output response when it comes to Vsense (V+ - V-) transient?

2. I found current sensors with digital output type such as INA220 and INA226 (5.5kHz and 3.5kHz each) have much narrow BW than analog current sensors do. The digital processing time would be added as well, so I assume that the total response time would be so slow when it's compared to the case of analog current sensors like INA193 and INA201. Could you correct me if any misunderstanding?

- BW indicates not only frequency range that the internal opamp can pass but also the response speed from my understanding. 

  • Hello Ella,

    Thanks for reaching out on our forum. 

    1. Yes lower bandwidth means the device will filter out higher frequency transients from showing up on the output. For periodic signals with frequencies above the bandwidth, the output will not be slower, the average of these periodic signals should provide some additional offset or bias to the below bandwidth signal that will be outputted.  For step signals, the higher frequency harmonics comprising the ramp up will be filtered out and in this case the INA282 output response to Vsense will look much slower compared to the INA193 and INA201. 

    2.  For the digital power monitors like the INA220 and INA226 there is both the conversion time and the averaging time.  In the case you take the fastest conversion time and only a single sample, the quickest time you might measure is a 140us.  Otherwise, it will be slower with response time =conversion time x number of averages.  So yes it would be slower than an analog current sensor.  However, if you are reading the analog output with an ADC you may still run into this issue or may be compromising for added cost, added board space, or added complexity in sharing that ADC channel with other peripherals.