Silicon Protection Arrays Application Guide Audio (Speaker/Microphone) Considerations: ● Audio ports typically have signals that swing above and below GND (i.e. ±2.5V) → If no bias is applied, a bidirectional protection device should be used → These devices will not clip the analog signal as they only conduct or turn on above ±6V → Protection of 2 data lines is shown below (i.e. Left and Right) ● Some audio ports will bias the data bus so that the signal never swings below GND (i.e. 0-5V) → If a bias is applied, a unidirectional OR bidirectional protection device could be used as neither device would clip the analog signal → The SP1001-02XTG is a good option in this case (not shown for Left and Right but is listed below) Application Schematic: Audio Port Audio Codec Left Right IC Outside World SP1002-02 Case GND Recommended SPA Devices: SP1002-02JTG ESD Level (Contact) ±8kV Lightning (tP=8/20μs) 2A I/O Capacitance 5pF # of Channels 2 SP1002-01JTG ±8kV 2A 5pF SP1001-02XTG ±8kV 2A 8pF Ordering Number ©2009 Littelfuse, Inc VRWM Packaging 6V SC70-5 1 6V SC70-3 2 6V SOT553 16