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MAX410BCSA Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX410BCSA Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 16 page Tech measures input-referred noise. For the circuit in Figure 5, assuming Rp is approximately equal to Rn and the measurement is taken with the Quan Tech model 5173, the equation simplifies to: Input Protection To protect amplifier inputs from excessive differential input voltages, most modern op amps contain input protection diodes and current-limiting resistors. These resistors increase the amplifier’s input-referred noise. They have not been included in the MAX410/MAX412/ MAX414, to optimize noise performance. The MAX410/ MAX412/MAX414 do contain back-to-back input pro- tection diodes which will protect the amplifier for differ- ential input voltages of ±0.1V. If the amplifier must be protected from higher differential input voltages, add external current-limiting resistors in series with the op amp inputs to limit the potential input current to less than 20mA. Capacitive-Load Driving Driving large capacitive loads increases the likelihood of oscillation in amplifier circuits. This is especially true for circuits with high loop gains, like voltage followers. The output impedance of the amplifier and a capacitive load form an RC network that adds a pole to the loop response. If the pole frequency is low enough, as when driving a large capacitive load, the circuit phase mar- gin is degraded. In voltage follower circuits, the MAX410/MAX412/ MAX414 remain stable while driving capacitive loads as great as 3900pF (see Figures 6a and 6b). When driving capacitive loads greater than 3900pF, add an output isolation resistor to the voltage follower circuit, as shown in Figure 7a. This resistor isolates the load capacitance from the amplifier output and restores the phase margin. Figure 7b is a photograph of the response of a MAX410/MAX412/MAX414 driving a 0.015µF load with a 10 Ω isolation resistor The capacitive-load driving performance of the MAX410/MAX412/MAX414 is plotted for closed-loop gains of -1V/V and -10V/V in the % Overshoot vs. Capacitive Load graph in the Typical Operating Characteristics. Feedback around the isolation resistor RI increases the accuracy at the capacitively loaded output (see Figure 8). The MAX410/MAX412/MAX414 are stable with a 0.01µF load for the values of RI and CF shown. In general, for decreased closed-loop gain, increase RI or CF. To drive larger capacitive loads, increase the value of CF. i e AHz n no 2 -20 3 3 - (1.64 10 )(20 10 ) (20 10 ) = ×× [] × / Single/Dual/Quad, 28MHz, Low-Noise, Low-Voltage, Precision Op Amps _______________________________________________________________________________________ 9 Figure 5. Current-Noise Test Circuit 100 Ω 909 Ω +5V 0.022 μF Rp 10k Ω D.U.T -5V eno MAX410 MAX412 MAX414 Rn 10k Ω 0.022 μF Figure 6a. Voltage Follower Circuit with 3900pF Load Rf 499 Ω D.U.T VOUT MAX410 MAX412 MAX414 3900pF VIN Figure 6b. Driving 3900pF Load as Shown in Figure 6a 1 μs/div INPUT 1V/div OUTPUT 1V/div GND GND VS = ±5V TA = +25 °C |
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