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ISL54200 데이터시트(PDF) 9 Page - Intersil Corporation |
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ISL54200 데이터시트(HTML) 9 Page - Intersil Corporation |
9 / 18 page ISL54200 9 FN6408.2 June 17, 2010 Application Block Diagram Detailed Description The ISL54200 device is a dual single pole/double throw (SPDT) analog switch that operates from a single DC power supply in the range of 2.7V to 5.5V. It was designed to function as a dual 2-to-1 multiplexer to select between a USB high-speed transceiver and a USB full-speed transceiver in portable battery powered products. It is offered in a TDFN package and a small µTQFN package for use in MP3 players, cameras, PDAs, cellphones, and other personal media players. The device has an enable pin to open all switches. The part consists of two 7Ω full speed (FSx) switches and two 4.5Ω high speed (HSx) switches. The FSx switches can swing from 0V to VDD. They were designed to pass USB full speed (12Mbps) differential data signals with minimal distortion. The HSx switches have high bandwidth and low capacitance to pass USB high-speed (480Mbps) differential data signals with minimal edge and phase distortion. The ISL54200 was designed for MP3 players, cameras, cellphones, and other personal media player applications that have both high-speed and full-speed transceivers and need to multiplex between these USB sources to a single USB host (computer). A typical application block diagram of this functionality is shown on page 9. A detailed description of the two types of switches are provided in the following sections. FSx Switches (FSD1, FSD2) The two FSx switches (FSD1, FSD2) are bidirectional switches that can pass rail-to-rail signals. When powered with a 3.3V supply, these switches have a nominal rON resistance of 7Ω over the signal range of 0V to 3.3V. They were specifically designed to pass USB full-speed (12Mbps) differential signals and meet the USB 2.0 full- speed signal quality specifications. See Figure 8. The FSx switches can also pass USB high speed signals (480Mbps) but do not quite meet the USB 2.0 high speed signal quality eye diagram compliance requirement. The maximum signal range for the FSx switches is from -1.5V to VDD. The signal voltage should not be allowed to exceed the VDD voltage rail or go below ground by more than -1.5V. When operated with a 2.7V to 3.6V supply, the FSx switches are active (turned ON) whenever the IN logic control voltage is ≤0.5V and the EN logic voltage ≥1.4V. HSx Switches (HSD1, HSD2) The two HSx switches (HSD2, HSD1) are bi-directional switches that can pass rail-to-rail signals. When powered with a 3.3V supply, these switches have a nominal rON of 4.5Ω over the signal range of 0V to 400mV with a rON flatness of 0.4Ω. The rON matching between the HSD1 and HSD2 switches over this signal range is only 0.01Ω, ensuring minimal impact by the switches to USB high speed signal transitions. As the signal level increases, the rON switch resistance increases. At signal level of 3.3V, the switch resistance is nominally 20Ω. The HSx switches were specifically designed to pass USB 2.0 high-speed (480Mbps) differential signals typically in the range of 0V to 400mV. They have low capacitance and high bandwidth to pass the USB high-speed signals with minimum edge and phase distortion to meet USB 2.0 high speed signal quality specifications. See Figures 9 and 10. The HSx switches can also pass USB full-speed signals (12Mbps) with minimal distortion and meet all the USB PORTABLE MEDIA DEVICE ISL54200 USB TRANSCEIVER HIGH-SPEED COMD1 COMD2 IN GND HSD1 HSD2 FSD1 FSD2 VDD EN LOGIC µCONTROLLER 4MΩ USB TRANSCEIVER FULL-SPEED VBUS D- D+ GND 3.3V ISL54200 |
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