Datasheet MAX4040, MAX4041, MAX4042, MAX4043, MAX4044 (Maxim) - 10

Single/Dual/Quad, Low-Cost, SOT23, Micropower, Rail-to-Rail I/O Op Amps
MAX4040-44 fig03 MAX4040-44 fig04 R V L = 100kΩ TIED TO VEE IN = 2V VIN = 4.0V RL = 100kΩ TIED TO VEE fIN = 1kHz SHDN 1V/div OUT 5V/div OUT 1V/div 1V/div IN 200µs/div 200µs/div Figure 3. Rail-to-Rail Input/Output Voltage Range Figure 4. Shutdown Enable/Disable Output Voltage
MAX4040–MAX4044 Shutdown Mode
1200 The MAX4041 (single) and MAX4043 (dual) feature a low-power shutdown mode. When the shutdown pin VCC = 5.5V, VOH = 200mV 1000 (SHDN) is pulled low, the supply current drops to 1µA µA) MAX4040-44 fig05a per amplifier, the amplifier is disabled, and the outputs V 800 CC = 2.4V, enter a high-impedance state. Pulling SHDN high or VOH = 200mV VCC = 5.5V, VOH = 100mV leaving it floating enables the amplifier. Take care to 600 ensure that parasitic leakage current at the SHDN pin does not inadvertently place the part into shutdown VCC = 2.4V, 400 mode when SHDN is left floating. Figure 4 shows the VOH = 100mV output voltage response to a shutdown pulse. The logic OUTPUT SOURCE CURRENT ( 200 threshold for SHDN is always referred to VCC / 2 (not to VCC = 5.5V, VOH = 50mV GND). When using dual supplies, pull SHDN to VEE to VCC = 2.4V, VOH = 50mV 0 enter shutdown mode. -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C)
Load-Driving Capability
The MAX4040–MAX4044 are fully guaranteed over tem- Figure 5a. Output Source Current vs. Temperature perature and supply voltage to drive a maximum resis- tive load of 25kΩ to VCC / 2, although heavier loads can be driven in many applications. The rail-to-rail output 3000 stage of the amplifier can be modeled as a current source when driving the load toward VCC, and as a cur- 2500 VCC = 5.5V, VOL = 200mV rent sink when driving the load toward VEE. The magni- MAX4040-44 fig05b µA) tude of this current source/sink varies with supply VCC = 2.4V, VOL = 200mV 2000 voltage, ambient temperature, and lot-to-lot variations of the units. V 1500 CC = 5.5V, VOL = 100mV Figures 5a and 5b show the typical current source and sink capability of the MAX4040–MAX4044 family as a 1000 function of supply voltage and ambient temperature. OUTPUT SINK CURRENT ( VCC = 2.4V, VOL = 100mV The contours on the graph depict the output current 500 VCC = 5.5V, VOL = 50mV value, based on driving the output voltage to within VCC = 2.4V, VOL = 50mV 50mV, 100mV, and 200mV of either power-supply rail. 0 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) Figure 5b. Output Sink Current vs. Temperature
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