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MAX5486EUG+ 其他数据使用手册 - Maxim Integrated（美信）
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Maxim Integrated（美信）
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主动器件
封装:
TSSOP-24
描述:
MAXIM INTEGRATED PRODUCTS MAX5486EUG+ 音频控制器, 立体声, 音量, 2.7V 至 5.5V, 按钮, TSSOP, 24 引脚, -40 °C
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Maxim > Design Support > Technical Documents > Tutorials > Audio Circuits > APP 1828
Maxim > Design Support > Technical Documents > Tutorials > Digital Potentiometers > APP 1828
Keywords: digital pot, digital potentiometer, audio volume control, MAX5407, MAX5408, MAX5409,
MAX5410, MAX5411, volume control, volume adjust, digital volume adjustment, log pots, digital log pots,
logarithmic taper, logarithmic, potentiometers
TUTORIAL 1828
Audio Gain Control Using Digital Potentiometers
Dec 26, 2002
Abstract: Digital potentiometers (pots) offer advantages for audio volume (gain) control applications and
can replace bulky mechanical pots, especially in handheld portable devices such as MP3 players, PDAs,
cell phones, mobile Internet devices, or stereo AM/FM radios. This document describes the types of
digital pots available for audio control such as logarithmic taper pots (log pots). It examines several
common designs using log taper pots and audio amplifiers, evaluates their advantages and
disadvantages, and recommends circuit designs.
A similar version of this article appeared in the January 7, 2002
issue of EE Times magazine.
Introduction
It is now common for portable multimedia equipment to include
some sort of stereo audio playback circuitry, perhaps for MP3 or
mobile Internet applications. Many specialized ICs are available for
these circuits and many use a mechanical potentiometer (pot). This
application note will demonstrate that widely available low-power
components can be just as effective. The article demonstrates how to achieve a stereo volume control
without a mechanical pot.
Traditional Mechanical Pot Design
Historically, audio volume controls used a special kind of potentiometer with a log (or sometimes audio)
taper or law (Figure 1). This approach derives from the roughly logarithmic response of the ear to
changes in sound pressure levels.
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