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MAX4454EUD Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4454EUD Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 15 page Low-Cost, +3V/+5V, 620µA, 200MHz, Single-Supply Op Amps with Rail-to-Rail Outputs ______________________________________________________________________________________ 11 Detailed Description The MAX4452/MAX4352 single, MAX4453/MAX4353 dual, and MAX4454/MAX4354 quad, single-supply, rail- to-rail, voltage-feedback amplifiers achieve high slew rates and wide bandwidths while consuming only 620µA per amplifier. Excellent speed/power ratio makes them ideal for portable devices and high-fre- quency signal applications. Internal feedback around the output stage ensures low open-loop output impedance, reducing gain sensitivity to load variations. This feedback also produces demand-driven current bias to the output transistors. Rail-to-Rail Outputs, Ground-Sensing Input The input common-mode range extends from (VEE - 0.1V) to (VCC - 1.5V) 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 180mV of either power-sup- ply rail with a 1k Ω load. The input ground-sensing and the rail-to-rail output substantially increase the dynamic range. Output Capacitive Loading and Stability The MAX4452/MAX4453/MAX4454/MAX4352/MAX4353/ MAX4354 are optimized for AC performance. They are not designed to drive highly reactive loads. Such loads decrease phase margin and may produce excessive ringing and oscillation. The use of an isolation resistor eliminates this problem (Figure 1). Figure 2 is a graph of the Optimal Isolation Resistor (RISO) vs. Capacitive Load. Applications Information Choosing Resistor Values Unity-Gain Configuration The MAX4452/MAX4453/MAX4454 are internally com- pensated for unity gain. When configured for unity gain, a 24 Ω feedback resistor (RF) is recommended. This resistor improves AC response by reducing the Q of the parallel LC circuit formed by the parasitic feedback capacitance and inductance. 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 2pF of amplifier input capaci- tance and 1pF of PC board capacitance, causes a pole at 106MHz. Since this pole is within the amplifier band- width, it jeopardizes stability. Reducing the 1k Ω resis- tors to 100 Ω extends the pole frequency to 1.06GHz, 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). 3b): RS RF RG RF RG = × + Figure 2. Optimal Isolation Resistor vs. Capacitive Load VOUT VIN RBIN RISO RF CL RG Figure 1. Driving a Capacitive Load Through an Isolation Resistor 10 14 12 18 16 22 20 24 28 26 30 0 50 100 150 ISOLATION RESISTANCE vs. CAPACITIVE LOAD CLOAD (pF) |
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