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Maxim > Design Support > Technical Documents > Application Notes > Audio Circuits > APP 2119
Maxim > Design Support > Technical Documents > Application Notes > Digital Potentiometers > APP 2119
Keywords: DS1802, volume control, digipot, digital pot, xicor, audio potentiometer, audix, digital potentiometers
APPLICATION NOTE 2119
Audio Characterization Report for the DS1802 Dual
Digital Audio Potentiometer
Mar 29, 2001
Abstract: The purpose of this document is to provide an examination of the DS1802 dual digital potentiomter's audio
characteristics. Test circuits were developed with the goal of measuring absolute error between tap points, inter-
channel matching, or tracking between two potentiometer wipers, total harmonic distortion (THD), intermodulation
distortion (IMD) and cross-talk.
Purpose
The purpose of this document is to provide an examination of the DS1802
Dual Digital Potentiometer's audio characteristics. Test circuits were developed
with the goal of measuring absolute error between tap points, inter-channel
matching or tracking between the two potentiometer wipers, total harmonic
distortion (THD), intermodulation distortion (IMD), and cross-talk. Additionally,
data is provided for mute levels for each potentiometer, as well as active and
standby current as a function of temperature and voltage. For this report, tests
are restricted to the range of frequencies 20Hz to 20kHz.
Test Circuit Configuration
To evaluate the DS1802's audio performance, the circuit of Figure 1 was constructed. As shown, this circuit
consists of two NE5532 Op Amps connected in a non-inverting unity gain configuration. Inputs to these buffer
stages were taken from each wiper of the DS1802.
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