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INA111AP Datasheet(PDF) 11 Page - Texas Instruments |
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INA111AP Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 17 page ![]() ® INA111 11 FIGURE 12. Voltage Controlled Current Source. FIGURE 11. AC-Coupled Instrumentation Amplifier. FIGURE 13. Shield Driver Circuit. FIGURE 14. Multiplexed-Input Data Acquisition System. INA111 R G V O C 1 0.1µF OPA602 Ref R 1 1M Ω f –3dB = 1 2 πR 1C1 = 1.59Hz V IN + – INA111 V IN + – V IN + – Channel 8 Channel 1 MPC800 MUX ADS574 +5V 12 Bits Out R G Ref INA111 OPA177 C 1 50nF R G R 2 R G Make G ≤ 10 where G = 1 + 50k Load V IN G • R 2 I L = R 1 10k Ω V IN Ref INA111 V IN – V IN + OPA602 511 Ω 22.1k Ω 22.1k Ω Ref V O For G = 100 R G = 511Ω // 2(22.1kΩ) effective R G = 505Ω 100 Ω NOTE: Driving the shield minimizes CMR degradation due to unequally distributed capacitance on the input line. The shield is driven at approximately 1V below the common-mode input voltage. |
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