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LMC6062IN Datasheet(PDF) 7 Page - National Semiconductor (TI) |
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LMC6062IN Datasheet(HTML) 7 Page - National Semiconductor (TI) |
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7 / 12 page  Typical Performance Characteristics V S = ±7.5V, TA = 25˚C, Unless otherwise specified (Continued) Applications Hints AMPLIFIER TOPOLOGY The LMC6062 incorporates a novel op-amp design topology that enables it to maintain rail-to-rail output swing even when driving a large load. Instead of relying on a push-pull unity gain output buffer stage, the output stage is taken directly from the internal integrator, which provides both low output impedance and large gain. Special feed-forward compensa- tion design techniques are incorporated to maintain stability over a wider range of operating conditions than traditional micropower op-amps. These features make the LMC6062 both easier to design with, and provide higher speed than products typically found in this ultra-low power class. COMPENSATING FOR INPUT CAPACITANCE It is quite common to use large values of feedback resis- tance for amplifiers with ultra-low input current, like the LMC6062. Although the LMC6062 is highly stable over a wide range of operating conditions, certain precautions must be met to achieve the desired pulse response when a large feedback resistor is used. Large feedback resistors and even small values of input capacitance, due to transducers, photo- diodes, and circuit board parasitics, reduce phase margins. When high input impedances are demanded, guarding of the LMC6062 is suggested. Guarding input lines will not only re- duce leakage, but lowers stray input capacitance as well. (See Printed-Circuit-Board Layout for High Impedance Work). The effect of input capacitance can be compensated for by adding a capacitor. Place a capacitor, C f, around the feed- back resistor (as in Figure 1 ) such that: or R 1 CIN ≤ R2 Cf Since it is often difficult to know the exact value of C IN,Cf can be experimentally adjusted so that the desired pulse re- sponse is achieved. Refer to the LMC660 and the LMC662 for a more detailed discussion on compensating for input capacitance. Non-Inverting Large Signal Pulse Response DS011298-33 Crosstalk Rejection vs Frequency DS011298-34 Stability vs Capacitive Load, R L = 20 kΩ DS011298-35 Stability vs Capacitive Load R L = 1MΩ DS011298-36 www.national.com 7 |
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