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LT1492 数据表(PDF) 13 Page - Linear Technology |
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LT1492 数据表(HTML) 13 Page - Linear Technology |
13 / 22 page LT6023/LT6023-1 13 60231fa For more information www.linear.com/LT6023 APPLICATIONS INFORMATION Figure 2. Some Op Amp Configurations Do Not Require Rail-to-Rail Inputs to Achieve Rail-to-Rail Outputs 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 60231 F02 – + accuracy is limited by the resistors shown to 0.2%. Output referred, this error becomes 2.7mV. The 30µV input offset voltage contribution, plus the additional error due to input bias current times the ~10k effective source impedance, contribute only negligibly to error. Phase Inversion TheLT6023inputstageislimitedtooperatingbetweenV–+ 1.2VandV+–1.4V.Exceedingthiscommonmoderangewill causetheopenloopgaintodropsignificantly.Foraunitygain amplifier, the output roughly tracks the input well beyond the specified input voltage range as shown in Figure 4. Figure 4. No Phase Inversion 0V 5V/DIV –20V –10V 20V 10V 2ms/DIV 60231 F04 OUTPUT INPUT –VCM LIMIT +VCM LIMIT VS = ±15V AV = 1 Figure 3. Extreme Inverting Case: Circuit Operates Properly with Input Voltage Swing Well Outside Op Amp Supply Rails 1.5V –1.5V 10k, 0.1% 100k, 0.1% VIN ±1.35V OUTPUT SWING ±13.5V SWINGS WELL OUTSIDE SUPPLY RAILS – + LT6023 60231 F03 Achieving Rail-to-Rail Operation without Rail-to-Rail Inputs The LT6023 output is able to swing close to each power supply rail, but the input stage is limited to operating between V– + 1.2V and V+ – 1.4V. For many inverting applications and noninverting gain applications, this is largely inconsequential. Figure 2 shows the basic op amp configurations, what happens to the op amp inputs and whether or not the op amp must have rail-to-rail inputs. The circuit of Figure 3 shows an extreme example of the inverting case. The input voltage at the 100k resistor can swing ±13.5V and the LT6023 will output an inverted, divided-by-ten version of the input voltage. The output |
类似零件编号 - LT1492 |
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类似说明 - LT1492 |
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