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AD515A Fiches technique(PDF) 6 Page - Analog Devices |
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AD515A Fiches technique(HTML) 6 Page - Analog Devices |
6 / 6 page AD515A –6– REV. A the total noise by about 40%. Noise currents driving the resistors also add, but in the AD515A are significant only above 10 11 Ω. Figure 11. Very High Impedance Instrumentation Amplifier Figure 12. Low Drift Integrator and Low Leakage Guarded Reset LOW LEVEL CURRENT-TO-VOLTAGE CONVERTERS Figure 2 shows a standard low level current-to-voltage converter. To obtain higher sensitivity, it is obvious to simply use a higher value feedback resistor. However, high value resistors above 10 9 Ω tend to be expensive, large, noisy and unstable. To avoid this, it may be desirable to use a circuit configuration with output gain, as in Figure 13. The drawback is that input errors of offset voltage drift and noise are multiplied by the same gain, but the precision performance of the AD515A makes the trade- off easier. Figure 13. Picoampere to Voltage Converter with Gain One of the problems with low level leakage current testing or low level current transducers (such as Clark oxygen sensors) is finding a way to apply voltage bias to the device while still grounding the device and the bias source. Figure 14 shows a technique in which the desired bias is applied at the noninvert- ing terminal thus forcing that voltage at the inverting terminal. The current is sensed by RF, and the AD524 instrumentation amplifier converts the floating differential signal to a single- ended output. Figure 14. Current-to-Voltage Converters with Grounded Bias and Sensor OUTLINE DIMENSIONS Dimensions shown in inches and (mm). TO-99 |
Numéro de pièce similaire - AD515A |
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Description similaire - AD515A |
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