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TLC27L2 Datasheet(PDF) 27 Page - Texas Instruments |
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TLC27L2 Datasheet(HTML) 27 Page - Texas Instruments |
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27 / 50 page  TLC27L2, TLC27L2A, TLC27L2B, TLC27L7 LinCMOS PRECISION DUAL OPERATIONAL AMPLIFIERS SLOS052D − OCTOBER 1987 − REVISED OCTOBER 2005 27 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION input characteristics The TLC27L2 and TLC27L7 are 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. The use of the polysilicon-gate process and the careful input circuit design gives the TLC27L2 and TLC27L7 very good input offset voltage drift characteristics relative to conventional metal-gate processes. Offset voltage drift in CMOS devices is highly influenced by threshold voltage shifts caused by polarization of the phosphorus dopant implanted in the oxide. Placing the phosphorus dopant in a conductor (such as a polysilicon gate) alleviates the polarization problem, thus reducing threshold voltage shifts by more than an order of magnitude. The offset voltage drift with time has been calculated to be typically 0.1 µV/month, including the first month of operation. Because of the extremely high input impedance and resulting low bias current requirements, the TLC27L2 and TLC27L7 are well suited for low-level signal processing; however, leakage currents on printed circuit boards and sockets can easily exceed bias current requirements and cause a degradation in device performance. It is good practice to include guard rings around inputs (similar to those of Figure 4 in the Parameter Measurement Information section). These guards should be driven from a low-impedance source at the same voltage level as the common-mode input (see Figure 40). Unused amplifiers should be connected as grounded unity-gain followers to avoid possible oscillation. noise performance The noise specifications in operational amplifier circuits are greatly dependent on the current in the first-stage differential amplifier. The low input bias current requirements of the TLC27L2 and TLC27L7 result in a low noise current, which is insignificant in most applications. This feature makes the devices especially favorable over bipolar devices when using values of circuit impedance greater than 50 k Ω, since bipolar devices exhibit greater noise currents. VI VI (b) INVERTING AMPLIFIER (c) UNITY-GAIN AMPLIFIER (a) NONINVERTING AMPLIFIER VI VO VO VO Figure 40. Guard-Ring Schemes output characteristics The output stage of the TLC27L2 and TLC27L7 is designed to sink and source relatively high amounts of current (see typical characteristics). If the output is subjected to a short-circuit condition, this high current capability can cause device damage under certain conditions. Output current capability increases with supply voltage. All operating characteristics of the TLC27L2 and TLC27L7 were measured using a 20-pF load. The devices drive higher capacitive loads; however, as output load capacitance increases, the resulting response pole occurs at lower frequencies, thereby causing ringing, peaking, or even oscillation (see Figure 41). In many cases, adding a small amount of resistance in series with the load capacitance alleviates the problem. |
Similar Part No. - TLC27L2_16 |
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Similar Description - TLC27L2_16 |
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