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LF13007 датащи(PDF) 5 Page - National Semiconductor (TI) |
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LF13007 датащи(HTML) 5 Page - National Semiconductor (TI) |
5 / 8 page Application Information FLOW-THROUGH OPERATION THE LF13006 LF13007 can be operated with control lines CS and WR grounded In this mode new data on the digital inputs will immediately set the new gain value Input data cannot be latched in this mode INPUT CURRENT Current flowing through the input (pin 2) due to bias current of the op amp will result in a gain error due to switch imped- ance Normally this error is very small For example 10 nA of bias current flowing through 3 kX of switch resistance will result in an error of 30 mV at the summing node However applications that have significant current flowing through the input must take this effect into account SETTLING TIME Settling time is a function of the particular op amp used with the LF130067 and the gain that is selected It can be opti- mized and stability problems can be prevented through the use of a lead capacitor from the inverting input to the output of the amplifier A lead capacitor is effective whenever the feedback around an amplifier is resistive whether with dis- crete resistors or with the LF130067 It compensates for the feedback pole created by the parallel resistance and capacitance from the inverting input of the op amp to AC ground Settling Time Test Circuit TLH5114 – 6 Typical Settling Time Curves TLH5114 – 7 Unstable at CL less than 2 pF Typical Applications Variable Capacitance Multiplier Ceffective e C1(gain set ) Note Output swing at input op amp is multiplied by set gain Signal range may be limited TLH5114 – 8 Variable Time Constant Filter Time constant e R N C1 N e setting of LF13006 (range e 1 128 to 1) TLH5114 – 9 5 |
Аналогичный номер детали - LF13007 |
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Аналогичное описание - LF13007 |
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