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LT1636CMS8 Datasheet(PDF) 11 Page - Linear Technology |
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LT1636CMS8 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  11 LT1636 1636fc APPLICATIONS INFORMATION The normally reverse biased substrate diode from the output to V– will cause unlimited currents to flow when the output is forced below V–. If the current is transient and limited to 100mA, no damage will occur. The LT1636 is internally compensated to drive at least 200pF of capacitance under any output loading condi- tions. A 0.22 µF capacitor in series with a 150Ω resistor between the output and ground will compensate these amplifiers for larger capacitive loads, up to 10,000pF, at all output currents. Distortion There are two main contributors of distortion in op amps: output crossover distortion as the output transitions from sourcing to sinking current and distortion caused by nonlinear common mode rejection. Of course, if the op amp is operating inverting there is no common mode induced distortion. When the LT1636 switches between input stages there is significant nonlinearity in the CMRR. Lower load resistance increases the output crossover distortion, but has no effect on the input stage transition distortion. For lowest distortion the LT1636 should be operated single supply, with the output always sourcing current and with the input voltage swing between ground and (V+ – 0.8V). See the Typical Performance Character- istics curves. Gain The open-loop gain is less sensitive to load resistance when the output is sourcing current. This optimizes per- formance in single supply applications where the load is returned to ground. The typical performance photo of Open-Loop Gain for various loads shows the details. Shutdown The LT1636 can be shut down two ways: using the shutdown pin or bringing V+ to within 0.5V of V–. When V+ is brought to within 0.5V of V– both the supply current and output leakage current drop to less than 1nA. When the shutdown pin is brought 1.2V above V –, the supply current drops to about 4 µA and the output leakage current is less than 1 µA,independentofV+.Ineithercasetheinput bias current is less than 0.1nA (even if the inputs are 44V above the negative supply). The shutdown pin can be taken up to 32V above V –. The shutdown pin can be driven below V –, however the pin current through the substrate diode should be limited with an external resistor to less than 10mA. Input Offset Nulling The input offset voltage can be nulled by placing a 10k potentiometer between Pins 1 and 8 with its wiper to V– (see Figure 1). The null range will be at least ±1mV. LT1636 10k 1636 F01 V – 1 8 Figure 1. Input Offset Nulling |
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