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ISL54212IRTZ Fiches technique(PDF) 8 Page - Intersil Corporation |
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ISL54212IRTZ Fiches technique(HTML) 8 Page - Intersil Corporation |
8 / 15 page 8 FN6556.0 September 18, 2007 Application Block Diagram Detailed Description The ISL54212 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 2.5V 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 ISL54212 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 diagram of this functionality is shown above. The ISL54212 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 ISL54212 also contains a logic control pin (CTRL) that when driven Low while IN is High, 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 and audio playback are intended to be mutually exclusive operations. Audio Switches The two audio switches (L, R) are 3 Ω switches that can pass signals that swing below ground by as much as 1.5V. They were designed to pass ground reference stereo signals with minimal insertion loss and very low distortion. Crosstalk between the audio switches over the audio band is < -110dB. Over a signal range of ±1V (0.707Vrms) with VDD >2.7V, these switches have an extremely low rON resistance variation. They can pass ground referenced audio signals with very low distortion (<0.06% THD+N) when delivering 15.6mW into a 32 Ω headphone speaker load. See Figures 8, 9, 10 and 11 THD+N performance curves. These switches are uni-directional switches. The audio drivers should be connected at the L and R side of the switch (pin 7 and pin 8) and the speaker loads should be connected at the COM side of the switch (pin 3 and pin 4). The audio switches are active (turned ON) whenever the IN voltage is ≥1.4V and the CTRL voltage to ≥1.4V. Note: Whenever the audio switches are ON the USB transceivers need to be in the high impedance. USB Switches The two USB switches (D+, D-) are bidirectional switches that can pass rail-to-rail signals. When powered with a 3.6V supply these switches have a nominal r(ON) of 4.6Ω over the ISL54212 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 MICRO-PROCESSOR VBUS LOGIC CIRCUITRY ISL54212 |
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