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OP1177ARM-R2 Datasheet(PDF) 20 Page - Analog Devices |
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OP1177ARM-R2 Datasheet(HTML) 20 Page - Analog Devices |
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20 / 24 page  OP1177/OP2177/OP4177 Rev. E | Page 20 of 24 200Ω 500Ω 4.37kΩ 100Ω 100Ω 20Ω 4.12kΩ 4.12kΩ 5kΩ 49.9kΩ ADR421 +15V 0.1µF V+ 100Ω RTD 1/2 OP2177 7 6 5 1/2 OP2177 1 8 2 3 4 V– VOUT VOUT where δ = ΔR/R is the fractional deviation of the RTD resistance with respect to the bridge resistance due to the change in temper- ature at the RTD. For δ << 1, the preceding expression becomes δ ⎥⎦ ⎤ ⎢⎣ ⎡ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ = ⎟⎟ ⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎜ ⎝ ⎛ + + δ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ ≅ REF REF O V R2 R1 R2 R1 R R2 R2 R1 R R1 V R R2 V 1 1 With VREF constant, the output voltage is linearly proportional to δ with a gain factor of ⎥⎦ ⎤ ⎢⎣ ⎡ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ R2 R1 R2 R1 R R2 V REF 1 R R R R(1+δ) ADR421 15V 0.1µF OP1177 6 7 4 2 3 V+ V– RF RF VOUT Figure 65. Low Power Linearized RTD Circuit SINGLE OPERATIONAL AMPLIFIER BRIDGE The low input offset voltage drift of the OP1177 makes it very effective for bridge amplifier circuits used in RTD signal condi- tioning. It is often more economical to use a single bridge operational amplifier as opposed to an instrumentation amplifier. In the circuit shown in Figure 66, the output voltage at the operational amplifier is Figure 66. Single Bridge Amplifier () ⎥ ⎥ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎢ ⎢ ⎣ ⎡ ⎟ ⎟ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎜ ⎜ ⎝ ⎛ δ + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + + δ = 1 1 R2 R1 R R1 V R R2 V REF O |
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