Other Parts Discussed in Thread: INA212, UCD90120A, INA214
In INA212 datasheet page10, there is equatation of Gain error based on Rfilt. And there is a example of INA212 with 100ohm Rfilt. It shows there is 2% gain error for this resistor. But based on equatation 1, it should be 100-[100*{700/(700+101)}]=12.6% ? I'm not sure if it's wrong in datasheet or what I understand? Pls advice.
Hi Tim,
I've been using the INA214 in my current sense circuit, directly connected to the input of a UCD90120A power sequencer (not shown). The INA214 has an input filter where Rfilt=100R and according to the currently released datasheet (as of today) the % Gain Error with a Rint=10K and Rfilt=100 = 0.99%.
Schematic snippet below, all resistors are 1%
Using the document attached in your earlier post to this thread the % Gain Error = 8.25%
I'm liking your document more than the datasheet because my INA214 output voltage is ~9% lower than I'd expect for various controlled load tests.
However, I am concerned that this isn't in the main datasheet, or linked from anywhere on the INA214 webpage. Can you confirm it is correct to do (9*Rs) as indicated in your equation 6 - the multiple by 9 isnt anywhere in the datasheet.
Also I believe there is an error in your document, the Rint values in Equations 4 & 2 are swapped in respect to Table 1 - which makes the Example tricky to follow :-)
Cheers,
Bruce.
