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TLC27L1MP Folha de dados(PDF) 23 Page - Texas Instruments |
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TLC27L1MP Folha de dados(HTML) 23 Page - Texas Instruments |
23 / 32 page TLC27L1, TLC27L1A, TLC27L1B LinCMOS LOW POWER OPERATIONAL AMPLIFIERS SLOS154B− DECEMBER 1995 − REVISED JUNE 2005 23 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION single-supply operation (continued) (b) SEPARATE BYPASSED SUPPLY RAILS (preferred) (a) COMMON SUPPLY RAILS Logic Logic Logic Power Supply Supply Power Logic Logic Logic OUT OUT Figure 39. Common Versus Separate Supply Rails input offset voltage nulling The TLC27L1 offers external input-offset null control. Nulling of the input-offset voltage may be achieved by adjusting a 25-k Ω potentiometer connected between the offset null terminals with the wiper connected as shown in Figure 40. Total nulling may not be possible. 25 k Ω N2 VDD N2 N1 25 k Ω GND (a) SINGLE SUPPLY (b) SPLIT SUPPLY − + − + N1 OUT OUT IN − IN + IN − IN + Figure 40. Input Offset-Voltage Null Circuit input characteristics The TLC27L1 is specified with a minimum and a maximum input voltage that, if exceeded at either input, could cause the device to malfunction. Exceeding this specified range is a common problem, especially in single-supply operation. Note that the lower range limit includes the negative rail, while the upper range limit is specified at VDD − 1 V at TA = 25°C and at VDD − 1.5 V at all other temperatures. |
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