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LMC6084AIMX Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LMC6084AIMX Datasheet(HTML) 8 Page - National Semiconductor (TI) |
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8 / 14 page  Typical Performance Characteristics (Continued) Non-Inverting Large Signal Pulse Response Crosstalk Rejection vs Frequency 01146735 01146736 Stability vs Capacitive Load, R L = 600 Ω Stability vs Capacitive Load R L =1M Ω 01146737 01146738 Applications Hints AMPLIFIER TOPOLOGY The LMC6084 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 LMC6084 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 LMC6084. Although the LMC6084 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 LMC6084 is suggested. Guarding input lines will not only reduce 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, C f, around the feedback resistors (as in Figure 1 ) such that: or R 1 CIN ≤ R 2 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 LMC662 for a more detailed discussion on compensating for input capaci- tance. www.national.com 8 |
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