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INA103KPG4 Datasheet(PDF) 10 Page - Texas Instruments |
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INA103KPG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 17 page ® INA103 10 Figure 6 shows an active control loop that adjusts the output offset voltage to zero. A 2, R, and C form an integrator that produces an offsetting voltage applied to one input of the INA103. This produces a –6dB/octave low frequency roll- off like the capacitor input coupling in Figure 5. COMMON-MODE INPUT RANGE For proper operation, the combined differential input signal and common-mode input voltage must not cause the input amplifiers to exceed their output swing limits. The linear input range is shown in the typical performance curve “Maximum Common-Mode Voltage vs Output Voltage.” For a given total gain, the input common-mode range can be increased by reducing the input stage gain and increasing the output stage gain with the circuit shown in Figure 7. OUTPUT SENSE An output sense terminal allows greater gain accuracy in driving the load. By connecting the sense connection at the load, I•R voltage loss to the load is included inside the feedback loop. Current drive can be increased by connect- ing a current booster inside the feedback loop as shown in Figure 11. FIGURE 6. Automatic DC Restoration. FIGURE 4. Output Offsetting. FIGURE 5. Input Offset Adjustment for AC-Coupled Inputs. 11 10 7 16 15 13 14 6 2 1 INA103 –In +In 50k Ω (1) 50k Ω (1) 100k Ω (1) V OUT Gain = 100V/V (40dB) NOTE: (1) 50k R, 100k pot is max recommended value. Use smaller values in this ratio if possible. ΩΩ I B – I B + I B – ≈ I B + ≈ 2.5µA 11 10 7 16 15 13 14 6 2 1 INA103 –In +In 100k Ω (1) V OUT + – 100k Ω (1) 10k Ω 2k Ω 100k Ω R C 1µF Gain = 100V/V (40dB) NOTE: (1) 100k is max recommended value. Use smaller value if possible. Ω 1/2 OPA1013 A 2 f–3dB = Gain 12 π RC 11 10 7 16 15 13 14 6 2 1 INA103 150 Ω – + 150 Ω 10k Ω OPA27 100µA(1) Offset Adjustment Range = ±15mV V– VOUT V+ NOTE: (1) 1/2 REF200 100µA(1) ∆VIN Gain = 1V/V (0dB) |
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