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MAX4397 Datasheet(PDF) 12 Page - Maxim Integrated Products |
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MAX4397 Datasheet(HTML) 12 Page - Maxim Integrated Products |
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12 / 30 page  Video Inputs All video inputs are AC-coupled with an external 0.1µF capacitor. Either a clamp or bias circuit sets the DC input level of the video signals. The clamp circuit posi- tions the sync tip of the Composite (CVBS), the Component RGB, or the S-Video Luma signal. If the sig- nal does not have a sync tip, then the clamp positions the minimum of the signal at the clamp voltage. The bias circuitry is used to position the S-video Chroma signal at midlevel of the Luma (Y) signal. On the video inputs that can receive either a Chroma or a Red video signal, the bias or clamp circuit is selected through I2C. See Tables 3–12 for loading register details. The MPEG decoder and VCR uses the RGB format and fast switching to insert an on-screen display (OSD), usu- ally text, onto the TV. The MAX4397 supports RGB as an input from either the VCR or the MPEG decoder and as an output only to the TV. The Red video signal of the RGB format and the Chroma video signal of the S-VHS format share the same SCART connector pin. Therefore, RGB and S-video signals cannot be present at the same time. Loop-through is possible with a Composite video signal but not with RGB signals because the RGB SCART pins are used for both input and output. In SCART, there is the possibility of a bidirectional use of the Red/Chroma pin. When using the Red/Chroma pin as an input port, terminate the Red/Chroma output with a 75Ω resistor to ground. Thus, a ground state is provided by an active pulldown to GNDVID on the Red/Chroma output to support the bidirectional Chroma or Red I/O, turning the output source resistors into ter- minations (see Figure 2). The active pulldown also pro- vides the “Mute Output” function, and disables the deselected video outputs. The “Mute Output” state is the default power-on state for video. For high-quality home video, the MPEG decoder, VCR, and TV use the S-video format. The MAX4397 supports S-video signals as an input from the VCR, the MPEG decoder, and the TV, and also as a separately switch- able output to the TV and VCR. Because S-video sup- port was not included in the original specifications of the SCART connector, the Luma (Y) signal of S-video and the CVBS signal share the same SCART connector pins. If S-video is present, then a Composite signal must be created from the Y and C signals to drive the RF_CVBS_OUT pin. For S-video, loop-through is not possible since the Chroma SCART port is used for both input and output. The MAX4397 supports Composite video (CVBS) for- mat, with inputs from the VCR, MPEG decoder, and TV. Full loop-through is possible to the TV and VCR only, since the MPEG decoder SCART connector has sepa- rate input and output pins for the CVBS format. Audio/Video Switch for Dual SCART Connectors 12 ______________________________________________________________________________________ CLAMP N CLAMP/BIAS TV_R/C_IN VIDEO INPUT TV_R/C_IN VIDEO INPUT 75Ω 0.1µF 0.1µF 75Ω PIN 15 PIN 13 PIN 15 PIN 13 MAX4397 MAX4397 TV_R/C_OUT PULLDOWN SCART CABLE SCART CONNECTORS PULLDOWN CLAMP N TV_R/C_OUT CLAMP/BIAS Figure 2. Bidirectional SCART Pins |
Similar Part No. - MAX4397_V01 |
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Similar Description - MAX4397_V01 |
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