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LT6012AIS Datasheet(PDF) 11 Page - Linear Technology |
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LT6012AIS Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page LT6011/LT6012 11 sn60112 60112fas APPLICATIO S I FOR ATIO where en = 14nV/√Hz , in = 0.1pA/√Hz and RS is the total impedance at the input, including the source impedance. Capacitive Loads The LT6011/LT6012 can drive capacitive loads up to 500pF in unity gain. The capacitive load driving capability increases as the amplifier is used in higher gain configurations. A small series resistance between the output and the load further increases the amount of capacitance that the amplifier can drive. Rail-to-Rail Operation The LT6011/LT6012 outputs can swing to within millivolts of either supply rail, but the inputs can not. However, for most op amp configurations, the inputs need to swing less than the outputs. Figure 1 shows the basic op amp configu- rations, lists what happens to the op amp inputs and speci- fies whether or not the op amp must have rail-to-rail inputs. Select a rail-to-rail input op amp only when really neces- sary, because the input precision specifications are usually inferior. RG VREF NONINVERTING: AV = 1 + RF/RG INPUTS MOVE BY AS MUCH AS VIN, BUT THE OUTPUT MOVES MORE INPUT MAY NOT HAVE TO BE RAIL-TO-RAIL NONINVERTING: AV = 1 INPUTS MOVE BY AS MUCH AS OUTPUT INPUT MUST BE RAIL-TO-RAIL FOR OVERALL CIRCUIT RAIL-TO-RAIL PERFORMANCE INVERTING: AV = –RF/RG OP AMP INPUTS DO NOT MOVE, BUT ARE FIXED AT DC BIAS POINT VREF INPUT DOES NOT HAVE TO BE RAIL-TO-RAIL VIN RF – + VIN VREF RF RG – + VIN 6011 F01 – + Figure 1. Some Op Amp Configurations Do Not Require Rail-to-Rail Inputs to Achieve Rail-to-Rail Outputs SI PLIFIED SCHE ATIC 6011 SS Q22 Q16 Q3 Q7 Q8 C B A B A Q15 V+ V– Q1 Q2 D2 D1 Q11 Q17 Q21 Q4 Q6 Q5 C2 Q12 D3 D4 D5 Q14 Q20 Q19 Q13 Q18 R3 R4 R6 R5 RC1 R1 500 Ω R2 500 Ω C1 C3 +IN –IN OUT Q9 Q10 (One Amplifier) |
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