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LMX324AUD Datasheet(PDF) 9 Page - Maxim Integrated Products |
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LMX324AUD Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 13 page Detailed Description Input Protection Circuit The LMX321/LMX358/LMX324’s inputs are protected from large differential input voltages by internal 3.5k Ω series resistors and back-to-back triple diode stacks across the inputs (Figure 1). For differential input volt- ages (much less than 1.8V), input resistance is typically 3M Ω. For differential input voltages greater than 1.8V, input resistance is around 7k Ω, and the input bias cur- rent can be approximated by the following equation: IBIAS = (VDIFF - 1.8V) / 7kΩ In the region where the differential input voltage approaches 1.8V, input resistance decreases exponen- tially from 3M Ω to 7kΩ as the diode block begins con- ducting. Inversely, the bias current increases with the same curve. Rail-to-Rail Output Stage The LMX321/LMX358/LMX324 drive 2k Ω loads and still typically swing within 40mV of the supply rails. Figure 2 shows the output voltage swing of the LMX321 config- ured with AVCL = +2V/V. Driving Capacitive Loads Driving a capacitive load can cause instability in many op amps, especially those with low quiescent current. The LMX321/LMX358/LMX324 are unity-gain stable for a range of capacitive loads to above 400pF. Figure 4 shows the response of the LMX321 with an excessive capacitive load. Adding a series resistor between the output and the load capacitor (Figure 5) improves the circuit’s response by isolating the load capacitance from the op amp’s output. Applications Information Power-Up The LMX321/LMX358/LMX324 outputs typically settle within 10µs after power-up. Figure 6 shows the output voltage on power-up and power-down. Single/Dual/Quad, General-Purpose, Low-Voltage, Rail-to-Rail Output Op Amps _______________________________________________________________________________________ 9 3.5k Ω 3.5k Ω Figure 1. Input Protection Circuit 200 µs/div 2.5V -2.5V VOUT 1V/div VIN 2V/div VCC = 2.5V, VEE = -2.5V, AVCL = 2V/V Figure 2. Rail-to-Rail Output Swing RL CL LMX321 LMX358 LMX324 Figure 3. Capacitive-Load-Driving Circuit 4 µs/div 2.6V 2.4V 2.6V 2.4V VOUT 100mV/div VIN 100mV/div VCC = 5V, VEE = 0, CL = 2.2nF RL = 2kΩ Figure 4. Output With Excessive Capacitive Load |
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