| Datenblatt-Suchmaschine für elektronische Bauteile |
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INA121P Datenblatt(PDF) 12 Page - Texas Instruments |
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INA121P Datenblatt(HTML) 12 Page - Texas Instruments |
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12 / 22 page ![]() 12 ® INA121 INA121 R G/2 R G = 5.6kΩ V O LA RL RA 10k Ω Ref NOTE: Due to the INA121’s current-feedback topology, V G is approximately 0.7V less than the common-mode input voltage. This DC offset in this guard potential is satisfactory for many guarding applications. Low bias current allows use with high electrode impedances. G = 10 2.8k Ω V G V G 2.8k Ω 1/2 OPA2131 390k Ω 390k Ω 1/2 OPA2131 FIGURE 12. Multiplexed-Input Data Acquisition System. FIGURE 13. Shield Driver Circuit. INA121 V IN – V IN + OPA130 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. FIGURE 14. ECG Amplifier With Right-Leg Drive. INA121 V IN + – V IN + – Channel 8 Channel 1 MPC800 MUX ADS7816 +5V V REF +In –In 12 Bits Out Serial R G Ref |
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