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INA128U-2K5 Datasheet(PDF) 11 Page - Texas Instruments |
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INA128U-2K5 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 20 page  INA128 INA129 SBOS051B − OCTOBER 1995 − REVISED FEBRUARY 2005 www.ti.com 11 Operation at very low supply voltage requires careful attention to assure that the input voltages remain within their linear range. Voltage swing requirements of internal nodes limit the input common-mode range with low power supply voltage. Typical performance curves, “Input Common-Mode Range vs Output Voltage” show the range of linear operation for ±15V, ±5V, and ±2.5V supplies. 300 Ω +5V R G INA128 V O Ref 2.5V − ∆V 2.5V + ∆V Figure 4. Bridge Amplifier INA128 R G V O OPA130 Ref R 1 1M Ω = 1 2 πR 1C1 = 1.59Hz V IN + f−3dB C1 0.1 µF − Figure 5. AC-Coupled Instrumentation Amplifier REF102 R 2 R 1 Pt100 Cu Cu V+ K 6 10.0V 4 2 INA128 V O Ref R G R3 100 Ω = Pt100 at 0°C SEEBECK ISA COEFFICIENT TYPE MATERIAL ( µV/5C) R1, R2 E + Chromel 58.5 66.5k Ω − Constantan J + Iron 50.2 76.8k Ω − Constantan K + Chromel 39.4 97.6k Ω − Alumel T + Copper 38.0 102k Ω − Constantan Figure 6. Thermocouple Amplifier with RTD Cold-Junction Compensation INA128 R G I B R 1 V IN + A 1 I O Load Ref I O + V IN R 1 @ G − A1 IB ERROR OPA177 ± 1.5nA OPA131 ± 50pA OPA602 ± 1pA OPA128 ± 75fA Figure 7. Differential Voltage to Current Converter INA128 R G/2 R G =5.6kΩ V O LA RL RA 10k Ω Ref G= 10 2.8k Ω V G V G 2.8k Ω 1/2 OPA2131 390k Ω 390k Ω 1/2 OPA2131 NOTE: Due to the INA128’s current-feedback topology, VG is approximately 0.7V less than the common-mode input voltage. This DC offset in this guard potential is satisfactory for many guarding applications. Figure 8. ECG Amplifier with Right-Leg Drive |
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