During various occasions a digital amplifier can generate a click or a pop. The click is generated at changes of the operational modes of the amplifier, e.g. charging of capacitors or mute / unmute. For Class D amplifier systems click is typically at PWM start and stop. The audibility of a click is very dependent on the system, amplifier and speaker. Also perception of the click is subjective. This makes it difficult to compare the results from two different systems. This document specifies a measurement technique, which can be used for all systems and makes results comparable, and give limits to what is acceptable in an end application. The described measurement technique applies to all systems, which have a start up sequence of less than 1ms. For Purepath systems this applies to TAS5026, TAS5036, TAS5066, TAS5076, TAS5028, TAS5508 and TAS5518. Measurements on 2 EVM’s TAS5066-5121K6EVM and TAS5508-5121K6EVM are shown for reference.
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