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OP297GSZ Datasheet(PDF) 11 Page - Analog Devices |
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OP297GSZ Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page OP297 Rev. F | Page 11 of 16 APPLICATIONS PRECISION ABSOLUTE VALUE AMPLIFIER PRECISION POSITIVE PEAK DETECTOR The circuit in Figure 31 is a precision absolute value amplifier with an input impedance of 30 MΩ. The high gain and low TCV In Figure 33, the CH must be of polystyrene, Teflon®, or polyethylene to minimize dielectric absorption and leakage. The droop rate is determined by the size of C OS of the OP297 ensure accurate operation with microvolt input signals. In this circuit, the input always appears as a common-mode signal to the op amps. The CMR of the OP297 exceeds 120 dB, yielding an error of less than 2 ppm. H and the bias current of the OP297. 2N930 +15V 1N4148 RESET VIN 5 6 7 1 3 –15V – + 1/2 OP297 – + 1/2 OP297 2 1kΩ 1kΩ 1kΩ 1kΩ CH 0.1µF 0.1µF VOUT +15V –15V 5 6 7 1 3 4 – + 1/2 OP297 – + 1/2 OP297 2 8 R1 1kΩ R3 1kΩ D1 1N4148 D2 1N4148 R2 2kΩ 0V < VOUT < 10V C1 30pF C2 0.1µF C3 0.1µF VIN Figure 33. Precision Positive Peak Detector SIMPLE BRIDGE CONDITIONING AMPLIFIER Figure 34 shows a simple bridge conditioning amplifier using the OP297. The transfer function is Figure 31. Precision Absolute Value Amplifier R R R R R V V F REF OUT ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ Δ + Δ = PRECISION CURRENT PUMP Maximum output current of the precision current pump shown in REF43 The provides an accurate and stable reference voltage for the bridge. To maintain the highest circuit accuracy, R Figure 32 is ±10 mA. Voltage compliance is ±10 V with ±15 V supplies. Output impedance of the current transmitter exceeds 3 MΩ with linearity better than 16 bits. F should be 0.1% or better with a low temperature coefficient. 15V 3 2 1 5 6 7 4 8 REF43 4 – + 1/2 OP297 – + 1/2 OP297 VREF RF R + ΔR VOUT VOUT = VREF ΔR R + ΔR RF R +15V 5 6 7 1 2 8 3 –15V – + 1/2 OP297 1/2 OP297 R1 10kΩ R2 10kΩ VIN R3 10kΩ R4 10kΩ R6 10kΩ IOUT 10mA IOUT = = = 10mA/V VIN R5 VIN 100Ω Figure 34. A Simple Bridge Condition Amplifier Using the OP297 Figure 32. Precision Current Pump |
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