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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AD8553 데이터시트(PDF) 18 Page - Analog Devices |
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AD8553 데이터시트(HTML) 18 Page - Analog Devices |
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18 / 24 page  AD8222 Rev. 0 | Page 18 of 24 R R AD8222 +15V +IN –IN 0.1µF 10µF 10µF 0.1µF REF VOUT –15V R1 499Ω CD 10nF CC 1nF CC 1nF 4.02kΩ 4.02kΩ Differential Input Voltages at High Gains When operating at high gain, large differential input voltages can cause more than 6 mA of current to flow into the inputs. This condition occurs when the differential voltage exceeds the following critical voltage VCRITICAL = (400 + RG) × (6 mA) This is true for differential voltages of either polarity. The maximum allowed differential voltage can be increased by adding an input protection resistor in series with each input. The value of each protection resistor should be RPROTECT = (VDIFF_MAX − VCRITICAL)/6 mA Figure 48. RFI Suppression RF INTERFERENCE Figure 48 shows an example where the differential filter frequency is approximately 2 kHz, and the common-mode filter frequency is approximately 40 kHz. RF rectification is often a problem when amplifiers are used in applications where there are 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 instrumentation amplifier, as shown in Figure 48. The filter limits the input signal bandwidth according to the following relationship. 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 AD8222. By using a value of CD 10× larger than the value of CC, the effect of the mismatch is reduced and performance is improved. ) (2 2 1 C D Diff C C R FilterFreq + π = COMMON-MODE INPUT VOLTAGE RANGE The three op amp architecture of the AD8222 applies gain and then removes the common-mode voltage. Therefore, internal nodes in the AD8222 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. Figure 7 and Figure 8 show the allowable common-mode input voltage ranges for various output voltages, supply voltages, and gains. C CM RC FilterFreq π = 2 1 where CD ≥ 10CC. |
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