The INA188 data sheet (September, 2015) specifies maximum input bias current of 2.5 nA in Table 6.5. But Figure 10 (below) shows a much larger magnitude. Is this a typo in the figure axis?
Till,
There is no typo in INA188 datasheet in IB spec (table 6.5) nor in IB vs Temp graph. The maximum IB of +/-2.5nA applies to room temperature of 25 deg C - this is a default condition shown in the upper left corner of the datasheet table - see red box below. IB over -40C to 125C is shown in Test Condition column (blue box) and it refers to Fig 10. Thus both of them are correct: +/-2.5nA@25C and graph over range of temperature. Also, please note that the graph shows only typical performance over temperature and NOT the max/min value.
Till,
Since the graph of IB vs Temp shows only TYPICAL value, it goes hand in hand with typical spec of +/-850pA at 25C in the table and not max. But you are correct that there is a typo in the units shown in vertical axis – it should be ‘pA’ and NOT ‘nA.’ I corrected it in the graph below. Thank you.
