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ISL54207 Folha de dados(PDF) 8 Page - Intersil Corporation |
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ISL54207 Folha de dados(HTML) 8 Page - Intersil Corporation |
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8 / 14 page  8 FN6403.0 December 5, 2006 Application Block Diagram Detailed Description The ISL54207 device is a dual single pole/double throw (SPDT) analog switch device that operates from a single DC power supply in the range of 2.7V to 3.6V. It was designed to function as a dual 2 to 1 multiplexer to select between USB differential data signals and mono audio/composite video baseband signals (CVBS). It comes in tiny μTQFN and TDFN packages for use in cameras, camcorders, video MP3 players, PDAs, cell phones, and other personal media players. The part consists of two 3 Ω audio/video switches and two 5 Ω USB switches. The audio/video switches can accept signals that swing below ground. They were designed to pass ground reference audio or dc restored with synch composite video signals with minimal distortion. The USB switches were designed to pass high-speed USB differential data signals with minimal edge and phase distortion. The ISL54207 was specifically designed for digital cameras, camcorders, MP3 players, cell phones and other personal media player applications that need to combine the audio/video jacks and the USB data connector into a single shared connector, thereby saving space and component cost. A typical application block diagram of this functionality is shown above. The ISL54207 incorporates circuitry for the detection of the USB VBUS voltage, which is used to switch between the audio/video drivers and USB transceiver of the media player. The ISL54207 contains a logic control pin (CTRL) that when driven Low while VBUS 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 following sections. The USB transmission and audio/video playback are intended to be mutually exclusive operations. NC1 and NC2 Audio/Video Switches The two NC (normally closed) audio/video switches (NC1, NC2) 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 audio signals and DC restored composite base-band signals (CVBS), including negative synchronizing pulse with minimal insertion loss and very low distortion and degradation. The -3dB bandwidth into 75 Ω is 338MHz (Figure 17). Crosstalk between NC1 and NC2 @ 4MHz is -78dB (Figure 16), which allows composite video to be routed through one switch and mono-audio through the other switch with little interference. The recommended maximum signal range is from -1.5V to 1.5V. You can apply positive signals greater than 1.5V but the rON resistance of the switch increases rapidly above 1.5V. The signal should not be allowed to exceed the VDD rail or swing more negative than -1.5V. Over a signal range of ±1V (0.707Vrms) with VDD > 2.7V, these switches have an extremely low rON resistance variation. They can pass a ground referenced audio signal with very low distortion (<0.06% THD+N) when delivering 15.6mW into a 32 Ω headphone speaker load. See Figures 10, 11, 12, and 13 THD+N performance curves. Figure 8 and 9 shows the vector scope plots of a standard NTSC color bar signal at both the input (Figure 8) and output (Figure 9) of the ISL54207. The plots show that except for a little attenuation due to switch rON and test fixture cabling, there is virtually no degradation of the video waveform through the switch. ISL54207 USB TRANSCEIVER HIGH-SPEED AUDIO COM1 COM2 VBUS GND NO1 NO2 NC1 NC2 VDD CTRL LOGIC CIRCUITRY mCONTROLLER 22k Ω 4M Ω 4M Ω 50k Ω 50k Ω NTSC or PAL VIDEO D+ D- ISL54207 |
Nº de peça semelhante - ISL54207 |
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Descrição semelhante - ISL54207 |
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