~ PDRV135|en| |2| Description Features Parametrics Diagrams Related end equipment Companion products.
Semiconductors > Integrated Circuits - ICs > Logic ICs > Buffers is this extra capacity relevant to the real world problems of driving audio lines with real audio signals? Or are you paying extra for capabilities you do not need, and cannot use? Examining the important electrical parameters of audio lines defines the minimum specifications for line drivers. Once understood, these parameters form the basis for evaluation of different output stages. What's Needed? Well, first you need all the obvious things: Stable into reactive loads. Swing at least ±11 volts peak (+20 d Bu). Be reliable. Run cool. Achieve the cost objectives. All these things are taken simply for granted. This is just good common sense design. This leaves two additional, very important criteria: Low Output Impedance High Output Current The problem comes about in quantifying these characteristics: Just how low an output impedance? And how much current? The remainder of this note sheds light on these questions. Simplifying a Complex Problem Let's dispel a myth right away: Practically speaking, electrical engineering transmission line theory does not apply to real world audio lines [1]. In spite of all the hysterical audiophile hi-fi (and lately pro audio) press to the contrary. This pseudo-science babble is nothing more than a (quite successful).
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