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MAX4386EEUD Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX4386EEUD Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 13 page Low-Cost, 230MHz, Single/Quad Op Amps with Rail-to-Rail Outputs and ±15kV ESD Protection _______________________________________________________________________________________ 9 Rail-to-Rail Outputs, Ground-Sensing Inputs The input common-mode range extends from (VEE - 200mV) to (VCC - 2.25V) with excellent common-mode rejection. Beyond this range, the amplifier output is a nonlinear function of the input, but does not undergo phase reversal or latchup. The output swings to within 50mV of either power-sup- ply rail with a 2k Ω load. The input ground sensing and the rail-to-rail output substantially increase the dynamic range. The input can swing 2.95VP-P and the output can swing 4.9VP-P with minimal distortion. Output Capacitive Loading and Stability The MAX4385E/MAX4386E are optimized for AC perfor- mance and do not drive highly reactive loads, which decreases phase margin and may produce excessive ringing and oscillation. Figure 2 shows a circuit that eliminates this problem. Figure 3 is a graph of the Optimal Isolation Resistor (RS) vs. Capacitive Load. Figure 4 shows how a capacitive load causes exces- sive peaking of the amplifier’s frequency response if the capacitor is not isolated from the amplifier by a resistor. A small isolation resistor (usually 10 Ω to 15Ω) placed before the reactive load prevents ringing and oscillation. At higher capacitive loads, the interaction of the load capacitance and the isolation resistor controls the AC performance. Figure 5 shows the effect of a 15 Ω isolation resistor on closed-loop response. 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 4. Small-Signal Gain vs. Frequency with Load Capacitance and No Isolation Resistor Figure 2. Driving a Capacitive Load Through an Isolation Resistor 9 11 10 13 12 15 14 16 0 200 100 300 400 50 250 150 350 450 500 ISOLATION RESISTANCE vs. CAPACITIVE LOAD CLOAD (pF) Figure 3. Isolation Resistance vs. Capacitive Load RG RF RISO CL VOUT VIN MAX438_E 3 -7 100k 10M 100M 1M 1G -5 FREQUENCY (Hz) -3 -1 1 2 -6 -4 -2 0 CL = 68pF RISO = 15 Ω CL = 120pF CL = 47pF Figure 5. Small-Signal Gain vs. Frequency with Load Capacitance and 27 Ω Isolation Resistor |
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