9.1.2.2 DC Error Voltage Over Temperature

The THP210 offers excellent dc accuracy at room temperature. In many applications, calibration techniques are

used to minimize the initial dc error; however, performing calibration over temperature is time-consuming and

expensive.

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

Figure 9-3 depicts the total error voltage at these given conditions:

• Circuit configuration as shown in Figure 9-2

• Temperature range from –40°C to +125°C

• Resistor tolerance of 1%

Gain (1 V/V)

1

2

3

4

5

0

200

400

600

800

1000

V(ERR_TEMPCO(FDA1))

V(ERR_TEMPCO(THP210))

V(ERR_TEMPCO(FDA2))

Figure 9-3. Calculation of Error Voltage Over Temperature at Different Gain Settings (Variable R2)

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

current drift. As a result of the ultra-low bias current drift of 15 pA/°C, the impact of higher gain resistors and

resistor tolerances marginally affects the error voltage with the THP210.

A 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 existing, state-of-the-art FDAs.

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THP210

SBOS932C – JANUARY 2020 – REVISED MARCH 2021

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