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INA105 Datasheet(PDF) 6 Page - Texas Instruments |
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INA105 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 17 page ® INA105 6 FIGURE 2. Offset Adjustment. FIGURE 3. Precision Difference Amplifier. For low source impedance applications, an input stage using OPA27 op amps will give the best low noise, offset, and temperature drift performance. At source impedances above about 10k Ω, the bias current noise of the OPA27 reacting with the input impedance begins to dominate the noise performance. For these applications, using the OPA111 or dual OPA2111 FET input op amp will provide lower noise performance. For lower cost use the OPA121 plastic. To construct an electrometer use the OPA128. R 1 R 2 GAIN CMRR MAX NOISE AT 1kHz A 1, A2 ( Ω)(Ω) (V/V) (dB) I B (nV/ √HZ) OPA27A 50.5 2.5k 100 128 40nA 4 OPA111B 202 10k 100 110 1pA 10 OPA128LM 202 10k 100 118 75fA 38 FIGURE 4. Precision Instrumentation Amplifier. 5 6 3 INA105 2 V 1 1 V 0 0utput A 2 A 1 R 2 R 2 R 1 –In V 1 +In V O = (1 + 2R2/R1) (V2 –V1) FIGURE 5. Current Receiver with Compliance to Rails. V 3 5 6 3 V O INA105 V O = V3 – V3 Offset Adjustment Range = ±300µV 2 R 3 R 1 R 2 R 4 V 2 10 Ω 499k Ω 10 Ω 100k Ω +15V –15V 1 V 3 5 6 3 V 0 INA105BM V 0 = V3 – V2 Gain Error = 0.005% CMR = 100dB Nonlinearity = 0.0002% 2 R 3 R 1 R 2 V 2 25k Ω +In –In 25k Ω R 4 25k Ω 25k Ω 1 V– 5 6 3 INA105 2 100 1% Ω 1 V 0 0 to 2V I IN 0 to 20mA 100 1% Ω |
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