THP210 datasheet(21/40 Pages) TI1

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Gain (1 V/V)

200

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600

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1000

V(ERR_TEMPCO(FDA1))

V(ERR_TEMPCO(THP210))

V(ERR_TEMPCO(FDA2))

THP210

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SBOS932A – FEBRUARY 2020 – REVISED MAY 2020

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Application Information (continued)

9.1.2.2 DC Error Voltage over Temperature

The THP210 offers excellent dc accuracy at room temperature. While in many applications calibration techniques

are used to minimize the initial DC error, performing calibration over temperature is time-consuming and

expensive.

The advanced drift specification of the THP210 helps further to mitigate the system error over temperature.

Figure 46 depicts the total error voltage at given conditions:

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Circuit configuration as shown in Figure 44

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Temperature Range from –40°C to 125°C

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Resistor Tolerance of 1%

The main contributors that are considered in this analysis are offset voltage drift, offset current drift and bias

current drift. Due to the ultra-low bias current drift of 15 pA/°C (see also the impact of higher gain resistors and

resistor tolerances marginally affects the error voltage with the THP210.

Figure 46. Calculation of Error Voltage over Temperature at Different Gain Settings (Variable R2)

One exemplary use case at a gain of 5 V/V shows that the total dc error over temperature of the THP210 is at 66

µV which is at least a factor of 10 smaller compared to today´s state-of-the art FDA´s.

THP210 Datasheet(PDF) 21 Page - Texas Instruments