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TPS7A3401DGNT Datasheet(PDF) 10 Page - Texas Instruments |
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TPS7A3401DGNT Datasheet(HTML) 10 Page - Texas Instruments |
10 / 18 page TPS7A3401 SBVS163 – JUNE 2011 www.ti.com APPLICATION INFORMATION POWER FOR PRECISION ANALOG DC/DC converters are generally the preferred One of the primary TPS7A3401 applications is to solution to step up or down a voltage rail when provide low-noise voltage rails to analog circuitry in current consumption is not negligible. They offer high order to improve system accuracy and precision. efficiency with minimum heat generation, but they have one primary disadvantage: they introduce a The TPS7A3401 negative high-voltage linear high-frequency component, and the associated regulator provides a low-noise voltage rail to analog harmonics, on top of the dc output signal. circuitry, such as operational amplifiers, ADCs, and DACs. This high-frequency component, if not filtered properly, degrades analog circuitry performance, Because of the low noise levels at high voltages, reducing overall system accuracy and precision. analog circuitry with high-voltage input supplies can be used. This characteristic allows for analog The TPS7A3401 offers a wide-bandwidth, high solutions to optimize the voltage range, thereby power-supply rejection ratio (PSRR). It is highly maximizing system accuracy. recommended to use the maximum performance schematic shown in Figure 18. Also, verify that the fundamental frequency (and its first harmonic, if POST DC/DC CONVERTER FILTERING possible) is within the bandwidth of the regulator Most of the time, the voltage rails available in a PSRR, shown in Figure 15. system do not match the voltage specifications demanded by one or more of its circuits; these rails must be stepped up or down, depending on specific voltage requirements. 10 Copyright © 2011, Texas Instruments Incorporated |
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