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THP210 Scheda tecnica(PDF) 20 Page - Texas Instruments |
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THP210 Scheda tecnica(HTML) 20 Page - Texas Instruments |
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20 / 41 page ![]() The THP210 super-beta input device features extremely-low input bias current, trimmed low input offset voltage, and the lowest offset drift over the full temperature operating range. These features allow the device to produce a negligible initial error band at 25°C, but also exceptional robust behavior over temperature. The red curve in Figure 9-1 showcases a simulation of the total dc error voltage at 25°C versus different gain configurations based on the application configuration shown in Figure 9-2. Gain (V/V) 0 1 2 3 4 5 6 7 8 9 10 10x10-6 20x10-6 30x10-6 50x10-6 100x10-6 200x10-6 300x10-6 500x10-6 1x10-3 2x10-3 3x10-3 5x10-3 5x10-3 VERR(FDA2) VERR(THP210) Figure 9-1. TINA-TI™ Software Simulation of DC Error Voltage at Different Gain Settings (Variable R2) + ± V VS+ + ± THP210 C L DNP V VOCM 2.5 V R 1 1 kŸ R 3 1 kŸ V VS± V PD R L 10 kŸ + ± V ICM 1.5 V + ± + ± + ± V ID/2 100 mV V ID/2 100 mV V IO I Bí I B+ V OD V INí V IN+ V OUTí V OUT+ V VS+ 5 V + ± V VSí 0 V R 2 R 2 Figure 9-2. FDA DC Error Model One use case at a differential input voltage of VID = 200 mV and a gain of 5 V/V (that corresponds to R2 = 5 kΩ) reveals that the initial dc error of the THP210 is 4.5 µV. A comparable FDA2 with VIO = 200 µV, IB = 650 nA, and IIO = 30 nA results in a 2.22-mV dc error voltage that results in a factor of approximately 500 higher dc error. In addition, Figure 9-3 shows that the absolute dc accuracy of the THP210 nearly adds an error voltage on the system. The dominant factors for the initial error band are mainly due to the feedback resistor mismatch that is not considered in the simulation plot. THP210 SBOS932B – FEBRUARY 2020 – REVISED OCTOBER 2020 www.ti.com 20 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: THP210 |
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