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INA106KP Datasheet(PDF) 6 Page - Texas Instruments |
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INA106KP Datasheet(HTML) 6 Page - Texas Instruments |
6 / 14 page INA106 6 SBOS152A www.ti.com To make a high performance high gain instrumentation amplifier, the INA106 can be combined with state-of-the-art op amps. For low source impedance applications, OPA37s will give the best noise, offset, and temperature drift. At source impedances above about 10k Ω, the bias current noise of the OPA37 reacting with input impedance degrades noise. For these applications, use an OPA111 or a dual OPA2111 FET input op amp for lower noise. For an electrometer grade IA, use the OPA128—see table below. Using the INA106 for the difference amplifier also extends the input common- mode range of the instrumentation amplifier to ±10V. A conventional IA with a unity-gain difference amplifier has an input common-mode range limited to ±5V for an output swing of ±10V. This is because a unity-gain difference amp needs ±5V at the input for 10V at the output, allowing only 5V additional for common-mode. R1 R2 GAIN CMRR NOISE AT 1kHz A1, A2 ( Ω)(kΩ) (V/V) (dB) Ib (pA) (nV/ √Hz) OPA37A 50.5 2.5 1000 128 40000 4 OPA111B 202 10 1000 110 1 10 OPA128LM 202 10 1000 118 0.075 38 FIGURE 8. Precision G = 11 Buffer. FIGURE 3. Difference Amplifier with Gain and CMR Adjust. FIGURE 4. Precision G = –10 Inverting Amplifier. This circuit follows an 11/1 divider with a gain of 11 for an overall gain of unity. With an 11/1 divider, the input signal can exceed 100V without damage. FIGURE 5. Voltage Follower with Input Protection. FIGURE 6. Precision Instrumentation Amplifier. FIGURE 7. Precision Summing Amplifier. 10 Ω 10 Ω 10k Ω 100k Ω 10k Ω 100k Ω 200 Ω 200 Ω V 1 V 2 2 3 5 1 6 E 0 Gain Adjust CMR Adjust INA106 To eliminate adjustment interactions, first adjust gain with V 2 grounded. 25 6 INA106 V O 3 R 3 10k Ω V O = VIN V IN R 1 10k Ω R 4 100k Ω 1 R 2 100k Ω ±100V Safe Input E 1 –In 2 3 5 1 6 INA106 E 0 = 10(1 + 2R2 /R1) (E2 – E1) A 2 A 1 E 2 +In R 1 R 2 E 0 Output R 2 25 6 INA106 V 0 V 1 R 1 10k Ω R 4 100k Ω 1 R 2 100k Ω R 3 10k Ω 3 V 3 V 0 = V1 + 10 V3 5 6 INA106 V O = 11VIN 1 2 V IN 3 V O Gain Error = 0.01% maximum 100k Ω 10k Ω 100k Ω 10k Ω V 2 25 6 INA106 V O 3 V O = –10V2 1 Gain Error = 0.01% maximum Nonlinearity = 0.001% maximum Gain Drift = 2.ppm/°C 10k Ω 100k Ω 10k Ω 100k Ω |
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