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MAX4041 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4041 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 16 page Single/Dual/Quad, Low-Cost, SOT23, Micropower, Rail-to-Rail I/O Op Amps 10 ______________________________________________________________________________________ Shutdown Mode The MAX4041 (single) and MAX4043 (dual) feature a low-power shutdown mode. When the shutdown pin (SHDN) is pulled low, the supply current drops to 1µA per amplifier, the amplifier is disabled, and the outputs enter a high-impedance state. Pulling SHDN high or leaving it floating enables the amplifier. Take care to ensure that parasitic leakage current at the SHDN pin does not inadvertently place the part into shutdown mode when SHDN is left floating. Figure 4 shows the output voltage response to a shutdown pulse. The logic threshold for SHDN is always referred to VCC / 2 (not to GND). When using dual supplies, pull SHDN to VEE to enter shutdown mode. Load-Driving Capability The MAX4040–MAX4044 are fully guaranteed over tem- perature and supply voltage to drive a maximum resis- tive load of 25k Ω to VCC / 2, although heavier loads can be driven in many applications. The rail-to-rail output stage of the amplifier can be modeled as a current source when driving the load toward VCC, and as a cur- rent sink when driving the load toward VEE. The magni- tude of this current source/sink varies with supply voltage, ambient temperature, and lot-to-lot variations of the units. Figures 5a and 5b show the typical current source and sink capability of the MAX4040–MAX4044 family as a function of supply voltage and ambient temperature. The contours on the graph depict the output current value, based on driving the output voltage to within 50mV, 100mV, and 200mV of either power-supply rail. 1200 0 -60 -40 -20 100 200 400 1000 TEMPERATURE (°C) 0 40 20 600 800 80 60 VCC = 5.5V, VOH = 200mV VCC = 5.5V, VOH = 100mV VCC = 2.4V, VOH = 50mV VCC = 5.5V, VOH = 50mV VCC = 2.4V, VOH = 200mV VCC = 2.4V, VOH = 100mV Figure 5a. Output Source Current vs. Temperature 3000 0 -60 -40 -20 100 500 1000 2500 TEMPERATURE (°C) 0 40 20 1500 2000 80 60 VCC = 5.5V, VOL = 200mV VCC = 2.4V, VOL = 200mV VCC = 5.5V, VOL = 100mV VCC = 2.4V, VOL = 50mV VCC = 5.5V, VOL = 50mV VCC = 2.4V, VOL = 100mV Figure 5b. Output Sink Current vs. Temperature 1V/div OUT IN 1V/div MAX4040-44 fig03 200 µs/div RL = 100kΩ TIED TO VEE VIN = 4.0V fIN = 1kHz Figure 3. Rail-to-Rail Input/Output Voltage Range MAX4040-44 fig04 200 µs/div 5V/div 1V/div SHDN OUT VIN = 2V RL = 100kΩ TIED TO VEE Figure 4. Shutdown Enable/Disable Output Voltage |
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