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INA209: Calculating measurement error

Part Number: INA209
Other Parts Discussed in Thread: INA226, INA231, INA300

Hello,

This part measures shunt voltage to infer current and bus voltage. I am attempting to evaluate the measurement error across the input and voltage current range of my application and would like some clarification as to the meaning of the figures stated in the datasheet.

My application has an 11-13V bus voltage input range, Vsense from 0-38mV, across a temperature range of 0 to 85 degrees celcius.

Typically I would sum the offset voltage error, gain error, and quantisation error to calculate the overall error on a given measurement.

In this instance that is not possible as the bus voltage offset and gain error is not specified (although graphs of typical performance are given, I need to know the maximum values of these parameters).

So my questions are:

1) What do the "current measurement error" and "bus voltage measurement error" specifications given in the "DC ACCURACY" section of the datasheet correspond to? 

2) In order to calculate the overall measurement error across the range of operating conditions in my application, should I simply assume 1% worst case current measurement error for both current and voltage and manually add the quantisation errors to these measurements?

3) Are you able to supply the maximum bus voltage offset and bus gain error specifications for this part?

Thanks in advance,

Gerry