DS1802的计算比率输出

摘要： DS1802是一个双音频设备范围内的对数电阻特性的锥形电位。每个电位器提供静音至少衰减90分贝的每一步和设备1分贝增量的65抽头。本数据表中给出的规格仅指分贝测量。如果设计者希望这些值计算比率，转换是必要的。本应用笔记回顾了从分贝比例转换。作为一个例子，工程师希望建立Excel表格描绘为DS1802和其他音频电位的增益计算公式在Excel中。虽然DS1802为例，本应用笔记适用于任何音频锥度电位。

Maxim > App Notes > AUDIO CIRCUITS DIGITAL POTENTIOMETERS

Keywords: dB gain, dBM, gain calculations, digital pot, digipot, epot, audio potentiometers, DS1802 Mar 03, 2003

APPLICATION NOTE 234
Calculate Ratiometric Outputs of the Log Pot DS1802

Abstract: The DS1802 is a dual audio taper-potentiometer with logarithmic resistive characteristics over the
device range. Each potentiometer provides 65 wiper positions with a 1dB increment per step and device mute
with at least 90dB of attenuation. The specifications given in this datasheet only refer to decibel measurements.
If a designer wishes to calculate these values in ratiometric terms, a conversion is necessary. This application
note reviews the conversion from decibel to ratiometric. The formula is given in Excel as an example,