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SN10501DBVRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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SN10501DBVRG4 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 34 page  APPLICATION INFORMATION HIGH-SPEED OPERATIONAL AMPLIFIERS WIDEBAND, INVERTING OPERATION Applications Section Contents WIDEBAND, NONINVERTING OPERATION _ + Rg 1.3 k Ω RT 649 Ω 100 pF 0.1 µF 6.8 µF −VS −5 V 50 Ω Source + VI 100 pF 0.1 µF 6.8 µF + +VS 5 V VO CT 0.1 µF Rf 1.3 k Ω RM 52.3 Ω 499 Ω _ + Rf 1.3 k Ω 49.9 Ω 100 pF 0.1 µF 6.8 µF −VS −5 V Rg 50 Ω Source + VI 100 pF 0.1 µF 6.8 µF + +VS 5 V VO 499 Ω 1.3 k Ω SN10501 SN10502 SN10503 SLOS408B – MARCH 2003 – REVISED JANUARY 2009 .................................................................................................................................................. www.ti.com decrease the loading effect of the feedback network on the output of the amplifier, but this enhancement comes at the expense of additional noise and The SN1050x operational amplifiers are a family of potentially lower bandwidth. Feedback-resistor values single, dual, and triple rail-to-rail output voltage between 1 k Ω and 2 kΩ are recommended for most feedback amplifiers. The SN1050x family combines situations. both a high slew rate and a rail-to-rail output stage. Since the SN1050x family are general-purpose, • Wideband, Noninverting Operation wideband voltage-feedback amplifiers, several • Wideband, Inverting Gain Operation familiar operational-amplifier applications circuits are • Video Drive Circuits available to the designer. Figure 34 shows a typical inverting configuration where the input and output • Single Supply Operation impedances and noise gain from Figure 33 are • Power Supply Decoupling Techniques and retained in an inverting circuit configuration. Inverting Recommendations operation is one of the more common requirements • Active Filtering With the SN1050x and offers several performance benefits. The • Driving Capacitive Loads inverting configuration shows improved slew rates • Board Layout and distortion due to the pseudo-static voltage maintained on the inverting input. • Thermal Analysis • Additional Reference Material • Mechanical Package Drawings The SN1050x is a family of unity gain stable rail-to-rail output voltage feedback operational amplifiers designed to operate from a single 3-V to 15-V power supply. Figure 33 is the noninverting gain configuration of 2V/V used to demonstrate the typical performance curves. Figure 34. Wideband, Inverting Gain Configuration In the inverting configuration, some key design considerations must be noted. One is that the gain resistor (Rg) becomes part of the signal channel input impedance. If input impedance matching is desired (beneficial when the signal is coupled through a cable, twisted pair, long PC-board trace, or other transmission-line conductors), Rg may be set equal to the required termination value and Rf adjusted to give the desired gain. However, care must be taken when Figure 33. Wideband, Noninverting Gain dealing with low inverting gains, because the resulting Configuration feedback-resistor value can present a significant load to the amplifier output. For an inverting gain of 2, Voltage-feedback amplifiers, unlike current-feedback setting Rg to 49.9 Ω for input matching eliminates the designs, can use a wide range of resistors values to need for RM but requires a 100-Ω feedback resistor. set their gain with minimal impact on their stability This has the advantage that the noise gain becomes and frequency response. Larger-valued resistors equal to 2 for a 50- Ω source impedance—the same 10 Submit Documentation Feedback Copyright © 2003–2009, Texas Instruments Incorporated Product Folder Link(s): SN10501 SN10502 SN10503 |
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