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MAX9911 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX9911 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 15 page 200kHz, 4µA, Rail-to-Rail I/O Op Amps with Shutdown 10 ______________________________________________________________________________________ Power-Supply Considerations The MAX9910–MAX9913 are optimized for single 1.8V to 5.5V supply operation. A high amplifier power-supply rejection ratio of 95dB (typ) allows the devices to be powered directly from a battery, simplifying design and extending battery life. Power-Up Settling Time The MAX9910–MAX9913 typically require 5µs after power-up. Supply settling time depends on the supply voltage, the value of the bypass capacitor, the output impedance of the incoming supply, and any lead resis- tance or inductance between components. Op-amp settling time depends primarily on the output voltage and is slew-rate limited. Figure 3 shows the MAX991_ in a noninverting voltage follower configuration with the input held at midsupply. The output settles in approxi- mately 18µs for VDD = 3V (see the Typical Operating Characteristics for power-up settling time). Shutdown Mode The MAX9911/MAX9913 feature active-low shutdown inputs. The MAX9911/MAX9913 enter shutdown in 2µs (typ) and exit in 30µs (typ). The amplifiers’ outputs are in a high-impedance state in shutdown mode. Drive SHDN low to enter shutdown. Drive SHDN high to enable the amplifier. The MAX9913 dual-amplifier fea- tures separate shutdown inputs. Shut down both ampli- fiers for the lowest quiescent current. Power-Supply Bypassing and Layout To minimize noise, bypass VDD with a 0.1µF capacitor to ground, as close to the pin as possible. Good layout techniques optimize performance by decreasing the amount of stray capacitance and inductance to the op amps’ inputs and outputs. Minimize stray capacitance and inductance by placing external components close to the IC. Figure 1. Rail-to-Rail Output Voltage Range RAIL-TO-RAIL OUTPUT VOLTAGE RANGE 200 µs/div IN_ 3V 3V 0V 0V 1V/div OUT_ 1V/div Figure 2. Using a Resistor to Isolate a Capacitive Load from the Op Amp MAX9910– MAX9913 RISO CL RL AV = ≈ 1V/V RL RL + RISO Figure 3. Power-Up Test Configuration MAX991_ 100k Ω 100k Ω OUT IN- IN+ 0V 5.5V VDD VSS |
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