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LP124 Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LP124 Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 10 page Application Hints (Continued) should be used from the output of the amplifier to ground The resistor biases the output into class A operation The LP124 has improved stability margin for driving capaci- tive loads No special precautions are needed to drive loads in the 50 pF to 1000 pF range It should be noted however that since the power supply current has been reduced by a factor of 10 so also has the slew rate and gain bandwidth product This reduction can cause reduced performance in AC applications where the LM124 is being replaced by an LP124 Such situations usually occur when the LM124 has been operated near its power bandwidth Output short circuits either to ground or to the positive pow- er supply should be of short time duration Units can be destroyed not as a result of the short circuit current causing metal fusing but rather due to the large increase in IC chip dissipation which will cause eventual failure due to exces- sive junction temperatures For example If all four amplifi- ers were simultaneously shorted to ground on a 10V supply the junction temperature would rise by 110 C Exceeding the negative common-mode limit on either input will cause a reversal of phase to the output and force the amplifier to the corresponding high or low state Exceed- ing the negative common-mode limit on both inputs will force the amplifier output to a high state Exceeding the positive common-mode limit on a single input will not change the phase of the output However if both inputs exceed the limit the output of the amplifier will be forced to a low state In neither case does a latch occur since return- ing the input within the common mode range puts the input stage and thus the amplifier in a normal operating mode The circuits presented in the section on typical applications emphasize operation on only a single power supply voltage If complementary power supplies are available all of the standard op amp circuits can be used In general introduc- ing a pseudo-ground (a bias voltage reference to Va 2) will allow operation above and below this value in single power supply systems Many application circuits are shown which take advantage of the wide input common-mode voltage range which includes ground In most cases input biasing is not required and input voltages which range to ground can easily be accommodated Driving CMOS TLH8562 – 3 Comparator with Hysteresis TLH8562 – 6 Non-Inverting Amplifier TLH8562 – 4 AdderSubtractor TLH8562 – 7 Unity Gain Buffer TLH8562 – 5 Positive Integrator TLH8562 – 8 http www nationalcom 5 |
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