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MAX4397 Datasheet(PDF) 13 Page - Maxim Integrated Products |
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MAX4397 Datasheet(HTML) 13 Page - Maxim Integrated Products |
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13 / 30 page  Video Outputs The DC level at the video outputs is controlled so that coupling capacitors are not required, and all of the video outputs are capable of driving a DC-coupled, 150Ω, back-terminated coax load with respect to ground. In a typical television input circuit (see Figure 3) the video output driver on the SCART chip only needs to source current. Users should note that, while the SCART specification states 75Ω impedance, in prac- tice, typical SCART chip implementations assume 75Ω input resistance to ground (and source current from the video output stage). Since some televisions and VCRs use the horizontal sync height for automatic gain control, the MAX4397 accurately reproduces the sync height to within ±2%. Slow Switching The MAX4397 supports the IEC 933-1, Amendment 1, tri-level slow switching that selects the aspect ratio for the display (TV). Under I2C-compatible control, the MAX4397 sets the slow-switching output voltage level. Table 1 shows the valid input levels of the slow-switch- ing signal and the corresponding operating modes of the display device. Two bidirectional ports are available for slow-switching signals for the TV and VCR. The slow-switching input status is continuously read and stored in the register 0Eh. The slow-switching outputs can be set to a logic level or high impedance by writing to registers 07h and 09h. See Tables 8 and 10 for details. Fast Switching The VCR or MPEG decoder outputs a fast-switching signal to the display device or TV to insert on-screen display (OSD). The fast-switching signal can also be set to a constant high or low output signal through the I2C interface. The fast-switching output can be set through writing to register 07h. Y/C Mixer The MAX4397 includes an on-chip mixer to produce Composite video (CVBS) when S-video (Y and C) is present. The Composite video drives the RF_CVBS_OUT output pin. The circuit sums Y and C signals to obtain the CVBS component. A +6dB output buffer drives RF_CVBS_OUT. Video Reconstruction Filter The encoder DAC outputs need to be lowpass-filtered to reject the out-of-band noise. The MAX4397 inte- grates the reconstruction filter. The filter is fourth order, which is composed of two Sallen-Key biquad in cas- cade, implementing a Butterworth-type transfer func- tion. The internal reconstruction filters feature a 6MHz cutoff frequency, and -35dB minimum attenuation at 27MHz. Note that the SET pin is used to set the accura- cy of the filter cutoff frequency. Connect a 100kΩ resis- tor from SET to ground. SCART Audio Switching Audio Inputs All audio inputs for the MAX4397S are single-ended and are AC-coupled. The MAX4397D audio inputs are singled-ended and AC-coupled except for the audio encoder input, which is differential DC-coupled. The audio block has three stereo audio inputs from the TV, the VCR, and the MPEG decoder SCART. Each input has a 100kΩ resistor connected to an internally generated voltage equal to 0.23 x V12, except for the encoder input of the MAX4397D, where the DC bias is fixed externally. Audio/Video Switch for Dual SCART Connectors ______________________________________________________________________________________ 13 Table 1. Slow-Switching Modes SLOW-SWITCHING SIGNAL VOLTAGE (V) MODE 0 to 2 Display device uses an internal source such as a built-in tuner to provide a video signal 4.5 to 7.0 Display device uses a video signal from the SCART connector and sets the display to 16:9 aspect ratio 9.5 to 12.6 Display device uses a signal from the SCART connector and sets the display to 4:3 aspect ratio MAX4397 SET-TOP BOX TV +5V VIDEO OUTPUT DC RESTORE SCART CABLE 0.1µF 5kΩ 75Ω INPUT TERMINATION RESISTOR 75Ω BACK TERMINATION RESISTOR Figure 3. Typical TV Input Circuit |
Similar Part No. - MAX4397_V01 |
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Similar Description - MAX4397_V01 |
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