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LM124-N データシート(PDF) 9 Page - Texas Instruments |
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LM124-N データシート(HTML) 9 Page - Texas Instruments |
9 / 22 page Typical Performance Characteristics (Continued) Output Characteristics Current Sinking Current Limiting 00929944 00929945 Input Current (LM2902 only) Voltage Gain (LM2902 only) 00929946 00929947 Application Hints The LM124 series are op amps which operate with only a single power supply voltage, have true-differential inputs, and remain in the linear mode with an input common-mode voltage of 0 V DC. These amplifiers operate over a wide range of power supply voltage with little change in performance characteristics. At 25˚C amplifier operation is possible down to a minimum supply voltage of 2.3 V DC. The pinouts of the package have been designed to simplify PC board layouts. Inverting inputs are adjacent to outputs for all of the amplifiers and the outputs have also been placed at the corners of the package (pins 1, 7, 8, and 14). Precautions should be taken to insure that the power supply for the integrated circuit never becomes reversed in polarity or that the unit is not inadvertently installed backwards in a test socket as an unlimited current surge through the result- ing forward diode within the IC could cause fusing of the internal conductors and result in a destroyed unit. Large differential input voltages can be easily accommo- dated and, as input differential voltage protection diodes are not needed, no large input currents result from large differ- ential input voltages. The differential input voltage may be larger than V + without damaging the device. Protection should be provided to prevent the input voltages from going negative more than −0.3 V DC (at 25˚C). An input clamp diode with a resistor to the IC input terminal can be used. To reduce the power supply drain, the amplifiers have a class A output stage for small signal levels which converts to class B in a large signal mode. This allows the amplifiers to both source and sink large output currents. Therefore both NPN and PNP external current boost transistors can be used to extend the power capability of the basic amplifiers. The output voltage needs to raise approximately 1 diode drop above ground to bias the on-chip vertical PNP transistor for output current sinking applications. For ac applications, where the load is capacitively coupled to the output of the amplifier, a resistor should be used, from the output of the amplifier to ground to increase the class A bias current and prevent crossover distortion. Where the load is directly coupled, as in dc applications, there is no crossover distortion. Capacitive loads which are applied directly to the output of the amplifier reduce the loop stability margin. Values of 50 pF can be accommodated using the worst-case non- inverting unity gain connection. Large closed loop gains or resistive isolation should be used if larger load capacitance must be driven by the amplifier. www.national.com 8 |
同様の部品番号 - LM124-N |
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同様の説明 - LM124-N |
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