LMV321M7SLASHNOPB datasheet(17/52 Pages) TI1

17 / 52 page

LMV321-N, LMV321-N-Q1, LMV358-N

LMV358-N-Q1, LMV324-N, LMV324-N-Q1

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SNOS012J – AUGUST 2000 – REVISED DECEMBER 2014

Overview (continued)

Figure 46. Output Swing of LMV324

Figure 47. Output Swing of LM324

8.2 Functional Block Diagram

Figure 48. Each Amplifier

8.3 Feature Description

8.3.1 Capacitive Load Tolerance

The LMV321-N/LMV358-N/LMV324-N can directly drive 200 pF in unity-gain without oscillation. The unity-gain

follower is the most sensitive configuration to capacitive loading. Direct capacitive loading reduces the phase

margin of amplifiers. The combination of the amplifier's output impedance and the capacitive load induces phase

lag. This results in either an underdamped pulse response or oscillation. To drive a heavier capacitive load, the

circuit in Figure 49 can be used.

Figure 49. Indirectly Driving a Capacitive Load Using Resistive Isolation

In Figure 49 , the isolation resistor RISO and the load capacitor CL form a pole to increase stability by adding more

phase margin to the overall system. The desired performance depends on the value of RISO. The bigger the RISO

resistor value, the more stable VOUT will be. Figure 50 is an output waveform of Figure 49 using 620Ω for RISO

and 510 pF for CL..

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Product Folder Links: LMV321-N LMV321-N-Q1 LMV358-N LMV358-N-Q1 LMV324-N LMV324-N-Q1

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