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LM7131BCM5X bảng dữ liệu(PDF) 10 Page - National Semiconductor (TI) |
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LM7131BCM5X bảng dữ liệu(HTML) 10 Page - National Semiconductor (TI) |
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10 / 23 page  Application Information (Continued) The LM7131 is available in two package types: SO-8 surface mount package and the SOT23-5 Tiny package for space and weight savings. The LM7131 has been designed to meet some of the most demanding requirements for single supply amplifiers — driving analog to digital converters and video cable driving. The output stage of the LM7131 has been spe- cially designed for the dynamic load presented by analog to digital converters. The LM7131 is capable of a 4V output range with a +5V single supply. The LM7131’s drive capabil- ity and good differential gain and phase make quality video possible from a small package with only a +5V supply. BENEFITS OF THE LM7131 The LM7131 can make it possible to amplify high speed sig- nals with a single +5V or +3V supply, saving the cost of split power supplies. EASY DESIGN PATH FROM ±5V to +5V SYSTEMS The SO-8 package and similar ±5V and single supply speci- fications means the LM7131 may be able to replace many more expensive or slower op amps, and then be used for an easy transition to 5V single supply systems. This could pro- vide a migration path to lower voltages for the amplifiers in system designs, reducing the effort and expense of testing and re-qualifying different op amps for each new design. In addition to providing a design migration path, the SOT23-5 Tiny surface mount package can save valuable board space. SPECIFIC ADVANTAGES OF SOT23-5 (TINY PACKAGE) The SOT23-5 (Tiny) package can save board space and al- low tighter layouts. The low profile can help height limited de- signs, such as sub-notebook computers, consumer video equipment, personal digital assistants, and some of the thicker PCMCIA cards. The small size can improve signal in- tegrity in noisy environments by placing the amplifier closer to the signal source. The tiny amp can fit into tight spaces and weighs little. This makes it possible to design the LM7131 into places where amplifiers could not previously fit. The LM7131 can be used to drive coils and transformers ref- erenced to virtual ground, such as magnetic tape heads and disk drive write heads. The small size of the SOT23-5 pack- age can allow it to be placed with a pre-amp inside of some rotating helical scan video head (VCR) assemblies. This avoids long cable runs for low level video signals, and can result in higher signal fidelity. Additional space savings parts are available in tiny packages from National Semiconductor, including low power amplifi- ers, precision voltage references, and voltage regulators. Notes on Performance Curves and Datasheet Limits Important: Performance curves represent an average of parts, and are not limits. SUPPLY CURRENT vs SUPPLY VOLTAGE Note that this curve is nearly straight, and rises slowly as the supply voltage increases. INPUT CURRENT vs INPUT VOLTAGE This curve is relatively flat in the 200 mV to 4V input range, where the LM7131 also has good common mode rejection. COMMON MODE VOLTAGE REJECTION Note that there are two parts to the CMRR specification of the datasheet for 3V and 5V. The common mode rejection ratio of the LM7131 has been maximized for signals near ground (typical of the active part of video signals, such as those which meet the RS-170 levels). This can help provide rejection of unwanted noise pick-up by cables when a bal- anced input is used with good input resistor matching. The mid-level CMRR is similar to that of other single supply op amps. BODE PLOTS (GAIN vs FREQUENCY FOR A V = +1) The gain vs. frequency plots for a non-inverting gain of 1 show the three voltages with the 150 Ω load connected in two ways. For the single supply graphs, the load is connected to the most negative rail, which is ground. For the split supply graphs, the load is connected to a voltage halfway between the two supply rails. DRIVING CABLES Pulse response curves for driving 75 Ω back terminate cables are shown for both 3V and 5V supplies. Note the good pulse fidelity with straight 150 loads, five foot (1.5 meter) and 75 foot (22 meter) cable runs. The bandwidth is reduced when used in a gain of ten (A V = +10). Even in a gain of ten con- figuration, the output settles to < 1% in about 100 ns, mak- ing this useful for amplifying small signals at a sensor or sig- nal source and driving a cable to the main electronics section which may be located away from the signal source. This will reduce noise pickup. Please refer to Figures 1, 2, 3, 4, 5 for schematics of test set- ups for cable driving. www.national.com 10 |
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