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ISL54216IRUZ-T Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL54216IRUZ-T Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 17 page 8 FN7701.0 September 27, 2010 Application Block Diagrams Detailed Description The ISL54216 device consists of dual SP3T (single pole/triple throw) analog switches. It operates from a single DC power supply in the range of 2.7V to 4.6V. It was designed to function as differential 3 to 1 multiplexer to select between three different differential data signals. Its offered in tiny µTQFN and TQFN packages for use in MP3 players, PDAs, cellphones, and other personal media players. A device consists of six 6Ω data switches. They were designed to pass high-speed USB differential data signals with minimal edge and phase distortion. They can swing rail-to-rail to pass UART and full-speed USB signals. The COM pins can accept signals that swing below ground by as much as -2V. This allows an audio source to be wired-or connected at the COM pins. The ISL54216 was specifically designed for MP3 players, personal media players and cellphone applications that need to combine three differential data channels into a single shared connector, thereby saving space and component cost. This functionality is shown in the Typical Application Block Diagram. A detailed description of the switches is provided in the following sections. Data Switches The six data switches (1D+, 1D-, 2D+, 2D-, 3D+, 3D-) are 6Ω bidirectional switches that were specifically designed to pass high-speed USB differential data signals in the range of 0V to 400mV. The switches have low capacitance and high bandwidth to pass USB high-speed signals (480Mbps) with minimum edge and phase distortion to meet USB 2.0 signal quality specifications. See Figures 11 and 12 for high-speed Eye Pattern taken with switch in the signal path. These switches can also swing rail-to-rail and pass USB full-speed (12Mbps) and UART signals with minimal distortion. See Figure 13 for USB full-speed Eye Pattern taken with switch in the signal path. The maximum normal operating signal range for the USB switches is from -1V to VDD. The signal voltage at D- and D+ should not be allow to exceed the VDD voltage rail or go below ground by more than -1V for normal operation. Fault Protection and Power-Off Protection However, in the event that the USB 5.25V VBUS voltage were shorted to one or both of the COM pins, the ISL54216 has fault protection circuitry to prevent damage to the ISL54216 part. The fault circuitry allows the signal pins (COM-, COM+, 1D-, 1D+, 2D-, 2D+, 3D-, 3D+) to be driven up to 5.25V while the VDD supply voltage is in the range of 0V to 4.6V. This fault condition causes no stress to the IC. In addition when VDD is at 0V (ground) all switches are OFF and the fault voltage is isolated from the other side of the switch (Power-Off Protection). When VDD is in the range of 2.7V to 4.6V, the fault voltage will pass through to the output of an active switch channel. Note: During the fault condition normal operation is not guaranteed until the fault condition is removed. ISL54216 Operation The discussion that follows will discuss using the ISL54216 in the “Application Block Diagrams” on page 8. ISL54216 USB TRANSCEIVER UART COM - COM + C1 GND 1D+ 1D- 2D+ 2D- VDD C0 LOGIC CONTROL µCONTROLLER VBUS 3.3V 3D- USB 4MΩ TRANSCEIVER 3D+ AUDIO CODEC ISL54406 HEAD PHONE JACK 100Ω ISL54216 |
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