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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TLC271 датащи(PDF) 57 Page - Texas Instruments |
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TLC271 датащи(HTML) 57 Page - Texas Instruments |
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57 / 84 page  TLC271, TLC271A, TLC271B LinCMOS PROGRAMMABLE LOW-POWER OPERATIONAL AMPLIFIERS SLOS090D – NOVEMBER 1987 – REVISED MARCH 2001 57 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION single-supply operation (continued) Many single-supply applications require that a voltage be applied to one input to establish a reference level that is above ground. A resistive voltage divider is usually sufficient to establish this reference level (see Figure 103). The low input bias current consumption of the TLC271 permits the use of very large resistive values to implement the voltage divider, thus minimizing power consumption. The TLC271 works well in conjunction with digital logic; however, when powering both linear devices and digital logic from the same power supply, the following precautions are recommended: 1. Power the linear devices from separate bypassed supply lines (see Figure 104); otherwise, the linear device supply rails can fluctuate due to voltage drops caused by high switching currents in the digital logic. 2. Use proper bypass techniques to reduce the probability of noise-induced errors. Single capacitive decoupling is often adequate; however, RC decoupling may be necessary in high-frequency applications. (b) SEPARATE BYPASSED SUPPLY RAILS (preferred) (a) COMMON SUPPLY RAILS Logic Logic Logic Power Supply Supply Power Logic Logic Logic OUT OUT Figure 104. Common Versus Separate Supply Rails |
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