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AMP02FS Datasheet(PDF) 10 Page - Analog Devices |
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AMP02FS Datasheet(HTML) 10 Page - Analog Devices |
10 / 12 page AMP02 REV. D –10– OVERVOLTAGE PROTECTION Instrumentation amplifiers invariably sit at the front end of in- strumentation systems where there is a high probability of expo- sure to overloads. Voltage transients, failure of a transducer, or removal of the amplifier power supply while the signal source is connected may destroy or degrade the performance of an unpro- tected device. A common technique used is to place limiting re- sistors in series with each input, but this adds noise. The AMP02 includes internal protection circuitry that limits the in- put current to ±4 mA for a 60 V differential overload (see Figure 28) with power off, ±2.5 mA with power on. Figure 28. AMP02’s Input Protection Circuitry Limits Input Current During Overvoltage Conditions POWER SUPPLY CONSIDERATIONS Achieving the rated performance of precision amplifiers in a practical circuit requires careful attention to external influences. For example, supply noise and changes in the nominal voltage directly affect the input offset voltage. A PSR of 80 dB means that a change of 100 mV on the supply, not an uncommon value, will produce a 10 µV input offset change. Consequently, care should be taken in choosing a power unit that has a low output noise level, good line and load regulation, and good tem- perature stability. In addition, each power supply should be properly bypassed. |
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