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LMC6582 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LMC6582 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 19 page  3.0 Low Voltage Operation (Continued) Battery Type Nominal Voltage End of Discharge Voltage NiMH 1.2V 1V NiCd 1.2V 1V Lead-Acid 2V 1.8V Silver Oxide 1.6V 1.3V Carbon-Zinc 1.5V 1.1V Lithium 2.6V–3.6V 1.7V–2.4V At V S = 2.2V, the LMC6582/4 has a rail-to-rail input common-mode voltage range. Figure 4 shows an input volt- age extending to both supplies and the resulting output. The amplifier is operational at V S = 1.8V, with guaranteed in- put common-mode voltage range, output swing, and CMRR specs. Figure 5 shows the response of the LMC6582/4 at V S = 1.8V. Figure 6 shows an input voltage exceeding both supplies with no resulting phase inversion on the output. 4.0 Capacitive Load Tolerance The LMC6582/4 can typically drive a 100 pF load with V S = 10V at unity gain without oscillating. The unity gain follower is the most sensitive configuration to capacitive load. Direct capacitive loading reduces the phase margin of op-amps. The combination of the op-amp’s output impedance and the capacitive load induces phase lag. This results in either an underdamped pulse response or oscillation. Capacitive load compensation can be accomplished using resistive isolation as shown in Figure 7. If there is a resistive component of the load in parallel to the capacitive compo- nent, the isolation resistor and the resistive load create a voltage divider at the output. This introduces a DC error at the output. Figure 8 displays the pulse response of the LMC6582 circuit in Figure 7. DS012041-6 FIGURE 4. The Input Common-Mode Voltage Range Extends to Both Supplies at V S = 2.2V DS012041-7 FIGURE 5. Response of the LMC6582/4 at V S = 1.8V DS012041-8 FIGURE 6. An Input Voltage Signal Exceeds LMC6582/4 Power Supply Voltages of V S = 1.8V with No Output Phase Inversion DS012041-9 FIGURE 7. Resistive Isolation of a 350 pF Capacitive Load DS012041-10 FIGURE 8. Pulse Response of the LMC6582 Circuit in Figure 7 www.national.com 11 |
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