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AD8231 데이터시트(PDF) 16 Page - Analog Devices |
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AD8231 데이터시트(HTML) 16 Page - Analog Devices |
16 / 20 page AD8231 Rev. 0 | Page 16 of 20 R R AD8231 +VS +INA –INA 0.1µF 10µF 10µF 0.1µF REF VOUT –VS CD 10nF CC 1nF CC 1nF 4.02kΩ 4.02kΩ Figure 33. RFI Suppression Figure 33 shows an example where the differential filter frequency is approximately 2 kHz, and the common-mode filter frequency is approximately 40 kHz. Values of R and CC should be chosen to minimize RFI. Mismatch between the R × CC at the positive input and the R × CC at negative input degrades the CMRR of the AD8231. By using a value of CD ten times larger than the value of CC, the effect of the mismatch is reduced and performance is improved. COMMON-MODE INPUT VOLTAGE RANGE The 3-op amp architecture of the AD8231 applies gain and then removes the common-mode voltage. Therefore, internal nodes in the AD8231 experience a combination of both the gained signal and the common-mode signal. This combined signal can be limited by the voltage supplies even when the individual input and output signals are not. To determine whether the signal could be limited, refer to Figure 3 through Figure 5 or use the following formula: V 04 . 0 2 V 04 . 0 − + < × ± < + − S DIFF CM S V Gain V V V If more common mode range is required, the simplest solution is to apply less gain in the instrumentation amplifier. The extra op amp can be used to provide another gain stage after the in-amp. Because the AD8231 has good offset and noise performance at low gains, applying less gain in the instrumentation amplifier generally has a limited impact on the overall system performance. |
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