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MAX4397DACTM Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4397DACTM Datasheet(HTML) 11 Page - Maxim Integrated Products |
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11 / 30 page  Audio/Video Switch for Dual SCART Connectors ______________________________________________________________________________________ 11 The slow-switching feature allows for bidirectional, tri- level, slow-switching input and output signals at pin VCR_SS and TV_SS, respectively. The slow-switching signals from the VCR set the aspect ratio or video source of the TV screen. See the Slow Switching section. Fast switching consists of two inputs from the encoder and VCR, and one output to the TV to insert an on- screen display (OSD). Fast switching is used to route video signals from the VCR or from the encoder to the TV. In addition, the fast-switching output can be config- ured to a high or low voltage. Fast switching is con- trolled through the I2C interface. The digital block contains the 2-wire interface circuitry, control, and status registers. The MAX4397DA/SA can be configured through an I2C-compatible interface. DEV_ADDR sets the I2C-compatible address. SCART Video Switching The MAX4397DA/SA switch video signals between an MPEG decoder, TV SCART, and VCR SCART. The video switch includes reconstruction filters, multiplexed video amplifiers, and a Y/C mixer driver for an RF modulator. See Figure 1 for the functional diagram of the video sec- tion. While the SCART connector supports RGB, S-video, and Composite video formats, RGB, and S-video typically share a bidirectional set of SCART connector pins. CLAMP/BIAS TV_R/C_IN CLAMP TV_Y/CVBS_IN CLAMP VCR_B_IN CLAMP VCR_G_IN CLAMP/BIAS VCR_R/C_IN VCRIN_FS CLAMP VCR_Y/CVBS_IN CLAMP ENC_Y/CVBS_IN CLAMP/BIAS ENC_R/C_IN CLAMP ENC_G_IN CLAMP ENC_B_IN CLAMP ENC_Y_IN ENCIN_FS BIAS ENC_C_IN 0.7V 0.7V 2kΩ 2kΩ V12 VCR_Y/CVBS_OUT VCR_R/C_OUT TV_R/C_OUT TV_G_OUT TV_B_OUT TV_Y/CVBS_OUT TVOUT_FS RF_CVBS_OUT TV_SS VCR_SS BIAS 5V 0V PULLDOWN TVRCOUT VGA 5dB, 6dB, OR 7dB PULLDOWN VCRRCOUT x2 x2 x2 x1 x2 VGA 5dB, 6dB, OR 7dB VGA 5dB, 6dB, OR 7dB N N MAX4397DA/SA FILTER FILTER MIXER SLOW SWITCHING FILTER FILTER FILTER FILTER Figure 1. MAX4397DA/SA Video Section Functional Diagram |
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