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OP481GS Datasheet(PDF) 11 Page - Analog Devices |
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OP481GS Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page OP181/OP281/OP481 –11– REV. 0 10 0% 100 90 0.2ms 0.1V 0V VIN VOUT Figure 35. Input and Output Signals with VCM < 0 V Overdrive Recovery Time The amount of time it takes for an amplifier to recover from saturation can be an important consideration when using an amplifier as a comparator or when outputs can be driven to the supplies. The overdrive recovery time for the OP181 is 50 µs with the amplifier running from a 3 volt supply and increases to 100 µs with a 10 volt supply. Figure 36 shows the result of the OP181 running from a 3 V supply with its output being overdriven. 10 0% 100 90 0.2ms 0.1V VS = +3V AV = +100 VIN SCALE 0.1V 0V VOUT SCALE 1V 0V Figure 36. Output of the Op Amp Recovering from Saturation Capacitive Loading Most low supply current amplifiers have difficulty driving capacitive loads due to the higher currents required from the output stage for such loads. Higher capacitance at the output will increase the amount of overshoot and ringing in the amplifier’s step response and could even affect the stability of the device. However, through careful design of the output stage and its high phase margin, the OPx81 family can tolerate some degree of capacitive loading. Figure 37 shows the step response of an OP181 with a 10 nF capacitor connected at the output. Notice that the overshoot of the output does not exceed more than 10% with such a load, even with a supply voltage of only +3 V. 10 0% 100 90 Figure 37. Ringing and Overshoot of the Output of the Amplifier A Micropower Reference Voltage Generator Many single supply circuits are configured with the circuit biased to 1/2 of the supply voltage. In these cases, a false- ground reference can be created by using a voltage divider buffered by an amplifier. Figure 38 shows the schematic for such a circuit. The two 1 M Ω resistors generate the reference voltage while drawing only 1.5 µA of current from a 3 V supply. A capacitor connected from the inverting terminal to the output of the op amp provides compensation to allow for a bypass capacitor to be connected at the reference output. This bypass capacitor helps establish an ac ground for the reference output. The entire reference generator draws less than 5 µA from a 3 V supply source. 6 7 4 2 3 OP181 10k Ω 0.022µF VREF +1.5V TO +6V 1µF 1µF 1M Ω +3V TO +12V 100 Ω 1M Ω Figure 38. A Micropower Bias Voltage Generator A Window Comparator The extremely low power supply current demands of the OPx81 family make it ideal for use in long life battery powered applica- tions such as a monitoring system. Figure 39 shows a circuit that uses the OP281 as a window comparator. |
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