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AD8226ARZ-R7 Scheda tecnica(PDF) 11 Page - Analog Devices |
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AD8226ARZ-R7 Scheda tecnica(HTML) 11 Page - Analog Devices |
11 / 16 page Preliminary Technical Data AD8226 Rev. PrA | Page 11 of 16 AD8226 +VS +IN –IN LOAD REF 0.1µF 10µF 0.1µF 10µF –VS VOUT Figure 6. Supply Decoupling, REF, and Output Referred to Local Ground References The output voltage of the AD8226 is developed with respect to the potential on the reference terminal. Care should be taken to tie REF to the appropriate local ground. INPUT BIAS CURRENT RETURN PATH The input bias current of the AD8226 must have a return path to ground. When the source, such as a thermocouple, cannot provide a return current path, one should be created, as shown in Figure 7. THERMOCOUPLE +VS REF –VS AD8226 CAPACITIVELY COUPLED +VS REF C C –VS AD8226 TRANSFORMER +VS REF –VS AD8226 INCORRECT CAPACITIVELY COUPLED +VS REF C R R C –VS AD8226 1 fHIGH-PASS = 2πRC THERMOCOUPLE +VS REF –VS 10MΩ AD8226 TRANSFORMER +VS REF –VS AD8226 CORRECT Figure 7. Creating an IBIAS Path RADIO FREQUENCY INTERFERENCE (RFI) RF rectification is often a problem when amplifiers are used in applications having strong RF signals. The disturbance can appear as a small dc offset voltage. High frequency signals can be filtered with a low-pass RC network placed at the input of the instru- mentation amplifier, as shown in Figure 8. The filter limits the input signal bandwidth, according to the following relationship: FilterFrequencyDIFF = ) 2 ( π 2 1 C D C C R + FilterFrequencyCM = C RC π 2 1 where CD ≥ 10 CC. R R AD8226 +VS +IN –IN 0.1µF 10µF 10µF 0.1µF REF VOUT –VS RG CD 10nF CC 1nF CC 1nF 4.02kΩ 4.02kΩ Figure 8. RFI Suppression CD affects the difference signal, and CC affects the common-mode signal. 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 the negative input degrades the CMRR of the AD8226. By using a value of CD one magnitude larger than CC, the effect of the mismatch is reduced, and performance is improved. |
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