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MAX4412 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4412 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 15 page Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs 10 ______________________________________________________________________________________ Inverting and Noninverting Configurations Select the gain-setting feedback (RF) and input (RG) resistor values that best fit the application. Large resis- tor values increase voltage noise and interact with the amplifier’s input and PC board capacitance. This can generate undesirable poles and zeros and decrease bandwidth or cause oscillations. For example, a nonin- verting gain-of-two configuration (RF = RG) using 1k Ω resistors, combined with 1.8pF of amplifier input capac- itance and 1pF of PC board capacitance, causes a pole at 114MHz. Since this pole is within the amplifier bandwidth, it jeopardizes stability. Reducing the 1k Ω resistors to 100 Ω extends the pole frequency to 1.14GHz, but could limit output swing by adding 200 Ω in parallel with the amplifier’s load resistor. Note: For high-gain applications where output offset voltage is a consideration, choose RS to be equal to the parallel combination of RF and RG (Figures 3a and 3b): Video Line Driver The MAX4412/MAX4413 are designed to minimize dif- ferential gain error and differential phase error to 0.01%/ 0.03° respectively, making them ideal for driving video loads. Active Filters The low distortion and high bandwidth of the MAX4412/MAX4413 make them ideal for use in active filter circuits. Figure 4 is a 15MHz lowpass, multiple- feedback active filter using the MAX4412. GAIN R R = 2 1 RS RF RG RF RG = × + VOUT VOUT = [1+ (RF / RG)] VIN IN RF R0 RG RS Figure 3a. Noninverting Gain Configuration VOUT IN RS RF RO RG VOUT = (RF / RG) VIN Figure 3b. Inverting Gain Configuration VOUT VIN RBIN RISO RF CL RG Figure 1. Driving a Capacitive Load Through an Isolation Resistor Figure 2. Isolation Resistance vs. Capacitive Load 10 16 14 12 18 20 22 24 26 28 30 0 400 200 600 800 1000 ISOLATION RESISTANCE vs. CAPACITIVE LOAD CLOAD (pF) |
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