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OP297GS Datasheet(PDF) 9 Page - Analog Devices |
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OP297GS Datasheet(HTML) 9 Page - Analog Devices |
9 / 16 page 8/21/97 4:00 PM OP297 –9– REV. D PRECISION POSITIVE PEAK DETECTOR In Figure 32, the CH must be of polystyrene, Teflon ®*, or poly- ethylene to minimize dielectric absorption and leakage. The droop rate is determined by the size of CH and the bias current of the OP297. + – VIN + – – + R1 10k Ω R2 10k Ω R4 10k Ω 1/2 OP-297 R3 10k Ω 2 3 1 R5 100 Ω IOUT ±10mA +15V 5 6 4 8 7 –15V 1/2 OP-297 IOUT = VIN R5 = VIN 100 Ω = 10mA/V Figure 31. Precision Current Pump SIMPLE BRIDGE CONDITIONING AMPLIFIER Figure 33 shows a simple bridge conditioning amplifier using the OP297. The transfer function is: VOUT =V REF ∆R R +∆R RF R The REF43 provides an accurate and stable reference voltage for the bridge. To maintain the highest circuit accuracy, RF should be 0.1% or better with a low temperature coefficient. 0.1 µF 0.1 µF – + 1/2 OP-297 3 2 1 – + 5 6 8 7 4 +15V –15V OUT V 1k Ω IN V 1N4148 2N930 1k Ω 1k Ω RESET H C 1k Ω 1/2 OP-297 Figure 32. Precision Positive Peak Detector *Teflon is a registered trademark of the Dupont Company Figure 33. A Simple Bridge Conditioning Amplifier Using the OP297 REF-43 R R + ∆R R R +5V 8 7 4 5 6 –5V 1/2 OP-297 1/2 OP-297 2 1 3 VOUT RF +5V 2 6 VREF 2.5V 4 – + – + VOUT VREF = ∆R R + ∆R RF R ( ( |
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