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USB333X Datasheet(PDF) 39 Page - Microchip Technology |
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USB333X Datasheet(HTML) 39 Page - Microchip Technology |
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39 / 85 page  2009 - 2015 Microchip Technology Inc. DS00001880A-page 39 USB333x In addition to USB Audio support the switches could also be used to multiplex a second Full Speed USB PHY to the USB connector. The signal quality will be degraded slightly due to the “on” resistance of the switches. The USB333x single-ended receivers described in Section 5.2.1 are enabled while in synchronous mode and are disabled when Carkit Mode is entered. The USB333x does not provide the DC bias for the audio signals. The SPK_R and SPK_L pins should be biased to 1.65V when audio signals are routed through the USB333x. This DC bias is necessary to prevent the audio signal from swinging below ground and being clipped by ESD Diodes. When the system is not using the USB Audio switches, the SPK_R and SPK_L switches should be disabled. |
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