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MAX4022ESD Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4022ESD Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page Low-Cost, High-Speed, Single-Supply, Gain of +2 Buffers with Rail-to-Rail Outputs in SOT23 10 ______________________________________________________________________________________ Disabled Output Resistance The MAX4014/MAX4017/MAX4019/MAX4022 include internal protection circuitry that prevents damage to the precision input stage from large differential input volt- ages, as shown in Figure 5. This protection circuitry con- sists of five back-to-back Schottky diodes between IN_+ and IN_-. These diodes lower the disabled output resis- tance from 1k Ω to 500Ω when the output voltage is 3V greater or less than the voltage at IN_+. Under these conditions, the input protection diodes will be forward biased, lowering the disabled output resistance to 500 Ω. Output Capacitive Loading and Stability The MAX4014/MAX4017/MAX4019/MAX4022 provide maximum AC performance with no load capacitance. This is the case when the load is a properly terminated transmission line. However, they are designed to drive up 25pF of load capacitance without oscillating, but with reduced AC performance. Driving large capacitive loads increases the chance of oscillations occurring in most amplifier circuits. This is especially true for circuits with high loop gains, such as voltage followers. The buffer’s output resistance and the load capacitor combine to add a pole and excess phase to the loop response. If the frequency of this pole is low enough to interfere with the loop response and degrade phase margin sufficiently, oscillations can occur. A second problem when driving capacitive loads results from the amplifier’s output impedance, which looks inductive at high frequencies. This inductance forms an L-C resonant circuit with the capacitive load, which causes peaking in the frequency response and degrades the amplifier’s gain margin. Figure 6 shows the frequency response of the MAX4014/ MAX4017/MAX4019/MAX4022 under different capacitive loads. To drive loads with greater than 25pF of capaci- tance or to settle out some of the peaking, the output requires an isolation resistor like the one shown in MAX4014 MAX4017 MAX4019 MAX4022 500 Ω 500 Ω OUT IN- IN+ Figure 5. Input Protection Circuit 6 -4 100k 10M 100M 1M 1G -2 FREQUENCY (Hz) 0 2 4 5 -3 -1 1 3 CL = 10pF CL = 15pF CL = 5pF Figure 6. Small-Signal Gain vs. Frequency with Load Capacitance and No Isolation Resistor 500 Ω 500 Ω RISO CL VOUT VIN RTIN 50 Ω MAX40_ _ Figure 7. Driving a Capacitive Load through an Isolation Resistor |
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