Audio in/out

Circuit Protection of Audio - In/Out



Design Notes:

Protection Application:
Audio signals can have a maximum value of 12Vp-p, and a maximum frequency less than 30kHz. At this frequency, the capacitance of the suppressor does not need to be taken into account. The signal lines to be protected from ESD are the left and right channels.
Solution Description:
As shown at the left, discrete multilayer varistors can be used for layout flexibility. Due to the analog nature of the audio signals, uni-polar TVS diode arrays are recommended only if the negative part of the signal is -0.5V or less since they may clip this part of the audio signal if the magnitude is larger.
Companion Solutions:
Other solutions within the Littelfuse MLV portfolio exist in addition to these recommendations. For example, if the manufacturing process cannot handle 0402-size components, devices with the same characteristics can be found in 0603-size.
Regulatory Issues:
The IEC 61000-4-2 will be the most appropriate standard that applies for this port. It supplies a test method for verifying that the end product is not susceptible to ESD events.
Unique Features:
Does not apply.
Application Warnings:
Does not apply.

Solutions

Solutions