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TLC27L2ID Datasheet(PDF) 26 Page - Texas Instruments |
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TLC27L2ID Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 50 page  TLC27L2, TLC27L2A, TLC27L2B, TLC27L7 LinCMOS PRECISION DUAL OPERATIONAL AMPLIFIERS SLOS052D − OCTOBER 1987 − REVISED OCTOBER 2005 26 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION single-supply operation While the TLC27L2 and TLC27L7 perform well using dual power supplies (also called balanced or split supplies), the design is optimized for single-supply operation. This design includes an input common-mode voltage range that encompasses ground as well as an output voltage range that pulls down to ground. The supply voltage range extends down to 3 V (C-suffix types), thus allowing operation with supply levels commonly available for TTL and HCMOS; however, for maximum dynamic range, 16-V single-supply operation is recommended. 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 38). The low input bias current of the TLC27L2 and TLC27L7 permits the use of very large resistive values to implement the voltage divider, thus minimizing power consumption. The TLC27L2 and TLC27L7 work 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 39); 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, high-frequency applications may require RC decoupling. 0.01 µF C R3 VREF VI R1 R2 VDD VO R4 V REF + V DD R3 R1 ) R3 V O + V REF –V I R4 R2 ) V REF Figure 38. Inverting Amplifier With Voltage Reference (b) SEPARATE BYPASSED SUPPLY RAILS (preferred) (a) COMMON SUPPLY RAILS Logic Logic Logic Supply Power Logic Logic Logic Supply Power VO VO Figure 39. Common Versus Separate Supply Rails |
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