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ISL54228IRUZ-T7A Scheda tecnica(PDF) 9 Page - Intersil Corporation |
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ISL54228IRUZ-T7A Scheda tecnica(HTML) 9 Page - Intersil Corporation |
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9 / 17 page  ISL54228 9 FN7628.0 July 29, 2010 Application Block Diagram Detailed Description The ISL54228 device is a dual single pole/single throw (SPST) analog switch configured as a DPST that operates from a single DC power supply in the range of 2.7V to 5.25V. It was designed for switching a USB high-speed source or full-speed source in portable battery powered products. It is offered in small µTQFN and TDFN packages for use in MP3 players, cameras, PDAs, cellphones, and other personal media players. The part consists of two 3.5Ω high speed SPST switches. These switches have high bandwidth and low capacitance to pass USB high-speed (480Mbps) differential data signals with minimal edge and phase distortion. They can also swing from 0V to 3.6V to pass USB full speed (12Mbps) differential data signals with minimal distortion. The device has a single logic control pin (OE) to open and close the two SPST switches. The part has an LP control pin to put the part in a low power state. The part contains special overvoltage protection (OVP) circuitry on the COM+ and COM- pins. This circuitry acts to open the SPST switches when the part senses a voltage on the COM pins that is >3.8V (typ) or < -0.45V (typ). It isolates voltages up to 5.25V and down to -5V from getting through to the other side of the switches (D-, D+) to protect the USB down-stream transceiver connected at the D+ and D- pins. The ISL54228 was designed for MP3 players, cameras, cellphones, and other personal media player applications that need to switch a high-speed or full- speed transceiver source. A typical application block diagram of this functionality is previously shown. A detailed description of the SPST switches is provided in the following section. High-Speed (Dx) SPST Switches The Dx switches are bi-directional switches that can pass USB high-speed and USB full-speed signals when VDD is in the range of 2.7V to 5.25V. When powered with a 2.7V supply, these switches have a nominal rON of 3.5Ω over the signal range of 0V to 400mV with a rON flatness of 0.26Ω. The rON matching between the switches over this signal range is only 0.2Ω, ensuring minimal impact by the switches to USB high speed signal transitions. As the signal level increases, the rON switch resistance increases. At a signal level of 3.3V, the switch resistance is nominally 9.8Ω. See Figures 8, 9, 10, 11, 12, 13 in the “Typical Performance Curves” beginning on page 12. The Dx switches were specifically designed to pass USB 2.0 high-speed (480Mbps) differential signals 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 Figure 14 in the “Typical Performance Curves” on page 13 for USB High-speed Eye Pattern taken with switch in the signal path. The Dx switches can also pass USB full-speed signals (12Mbps) in the range of 0V to 3.6V with minimal PORTABLE MEDIA DEVICE ISL54228 USB TRANSCEIVER HIGH-SPEED COM - COM + GND D+ D- VDD OE µCONTROLLER VBUS D- D+ GND OR FULL-SPEED OVP DET 4MΩ LP Logic 4MΩ 500Ω 3.3V Control ISL54228 |
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Descrizione simile - ISL54228IRUZ-T7A |
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