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LM7301 bảng dữ liệu(PDF) 8 Page - National Semiconductor (TI) |
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LM7301 bảng dữ liệu(HTML) 8 Page - National Semiconductor (TI) |
8 / 11 page Applications Information (Continued) POWER DISSIPATION Although the LM7301 has internal output current limiting, shorting the output to ground when operating on a +30V power supply will cause the opamp to dissipate about 350 mW. This is a worst-case example. In the SO-8 pack- age, this will cause a temperature rise of 58˚C. In the SOT23-5 package, the higher thermal resistance will cause a calculated rise of 113˚C. This can raise the junction tem- perature to above the absolute maximum temperature of 150˚C. Operating from split supplies greatly reduces the power dis- sipated when the output is shorted. Operating on ±15V sup- plies can only cause a temperature rise of 29˚C in the SO-8 and 57˚C in the SOT23-5 package, assuming the short is to ground. SPICE Macromodel A SPICE macromodel for this and many other National Semiconductor operational amplifiers is available, at no charge, from the NSC Customer Support Center at 800-272-9959 or on the World Wide Web at http:// www.national.com/models. WIDE SUPPLY RANGE The high power-supply rejection ratio (PSRR) and common-mode rejection ratio (CMRR) provide precision per- formance when operated on battery or other unregulated supplies. This advantage is further enhanced by the very wide supply range (2.2V–30V, guaranteed) offered by the LM7301. In situations where highly variable or unregulated supplies are present, the excellent PSRR and wide supply range of the LM7301 benefit the system designer with con- tinued precision performance, even in such adverse supply conditions. SPECIFIC ADVANTAGES OF SOT23-5 (TinyPak) The obvious advantage of the SOT23-5, TinyPak, is that it can save board space, a critical aspect of any portable or miniaturized system design. The need to decrease overall system size is inherent in any handheld, portable, or light- weight system application. Furthermore, the low profile can help in height limited de- signs, such as consumer hand-held remote controls, sub-notebook computers, and PCMCIA cards. An additional advantage of the tiny package is that it allows better system performance due to ease of package place- ment. Because the tiny package is so small, it can fit on the board right where the opamp needs to be placed for optimal performance, unconstrained by the usual space limitations. This optimal placement of the tiny package allows for many system enhancements, not easily achieved with the con- straints of a larger package. For example, problems such as system noise due to undesired pickup of digital signals can be easily reduced or mitigated. This pick-up problem is often caused by long wires in the board layout going to or from an opamp. By placing the tiny package closer to the signal source and allowing the LM7301 output to drive the long wire, the signal becomes less sensitive to such pick-up. An overall reduction of system noise results. Often times system designers try to save space by using dual or quad opamps in their board layouts. This causes a complicated board layout due to the requirement of routing several signals to and from the same place on the board. Us- ing the tiny opamp eliminates this problem. Additional space savings parts are available in tiny packages from National Semiconductor, including low power amplifi- ers, precision voltage references, and voltage regulators. LOW DISTORTION, HIGH OUTPUT DRIVE CAPABILITY The LM7301 offers superior low-distortion performance, with a total-harmonic-distortion-plus-noise of 0.06% at f = 10 kHz. The advantage offered by the LM7301 is its low distor- tion levels, even at high output current and low load resis- tance. Typical Applications HANDHELD REMOTE CONTROLS The LM7301 offers outstanding specifications for applica- tions requiring good speed/power trade-off. In applications such as remote control operation, where high bandwidth and low power consumption are needed. The LM7301 perfor- mance can easily meet these requirements. OPTICAL LINE ISOLATION FOR MODEMS The combination of the low distortion and good load driving capabilities of the LM7301 make it an excellent choice for driving opto-coupler circuits to achieve line isolation for mo- dems. This technique prevents telephone line noise from coupling onto the modem signal. Superior isolation is achieved by coupling the signal optically from the computer modem to the telephone lines; however, this also requires a low distortion at relatively high currents. Due to its low distor- tion at high output drive currents, the LM7301 fulfills this need, in this and in other telecom applications. DS012842-20 FIGURE 5. DS012842-21 FIGURE 6. www.national.com 8 |
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Mô tả tương tự - LM7301 |
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