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ISL54206IRUZ-T Scheda tecnica(PDF) 7 Page - Intersil Corporation |
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ISL54206IRUZ-T Scheda tecnica(HTML) 7 Page - Intersil Corporation |
7 / 13 page 7 FN6409.0 December 18, 2006 Application Block Diagrams Detailed Description The ISL54206 device is a dual single pole/double throw (SPDT) analog switch device that can operate from a single dc power supply in the range of 1.8V to 5.5V. It was designed to function as a dual 2 to 1 multiplexer to select between USB differential data signals and audio L and R stereo signals. It comes in tiny µTQFN and TDFN packages for use in MP3 players, PDAs, cell phones, and other personal media players. The part consists of two 3 Ω audio switches and two 5Ω USB switches. The audio switches can accept signals that swing below ground. They were designed to pass audio left and right stereo signals, that are ground referenced, with minimal distortion. The USB switches were designed to pass high-speed USB differential data signals with minimal edge and phase distortion. The ISL54206 was specifically designed for MP3 players, cell phones and other personal media player applications that need to combine the audio headphone jack and the USB data connector into a single shared connector, thereby saving space and component cost. Typical application block diagrams of this functionality is shown above. The ISL54206 has a single logic control pin (IN) that selects between the audio switches and the USB switches. This pin can be driven Low or High to switch between the audio CODEC drivers and USB transceiver of the MP3 player or cellphone. The ISL54206 also contains a logic control pin (CTRL) that when driven Low while IN is Low, opens all switches and puts the part into a low power state, drawing typically 1nA of IDD current. A detailed description of the two types of switches is provided in the sections following. The USB transmission ISL54206 USB TRANSCEIVER HIGH-SPEED CODEC COM- COM+ IN GND D- D+ L R VDD CTRL μCONTROLLER 4M Ω 50k Ω 50k Ω LOGIC CONTROL VIA VBUS VOLTAGE FROM COMPUTER OR USB HUB LOGIC CONTROL VIA MICRO-PROCESSOR VBUS VBUS LOGIC CIRCUITRY ISL54206 USB TRANSCEIVER HIGH-SPEED CODEC COM- COM+ IN GND D- D+ L R VDD CTRL LOGIC CIRCUITRY μCONTROLLER 22k Ω 4M Ω 4M Ω 50k Ω 50k Ω ISL54206 |
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