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NCS2566DTBR2G Datasheet(PDF) 11 Page - ON Semiconductor |
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NCS2566DTBR2G Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 13 page NCS2566 http://onsemi.com 11 APPLICATIONS INFORMATION The NCS2566 6−channel video filter driver has been optimized for Standard and High Definition video applications covering the requirements of the standards Composite video (CVBS), S−Video, Component Video (480i/525i, 576i/625i, 720p/1080i) and related (RGB). The first 3−channels (SD1, SD2, SD3) are dedicated for Standard Definition, CVBS and S−Video applications for which the frequency bandwidth required does not exceed 8 MHz. The 3 other channels (SD/HD1, SD/HD2, SD/HD3) have selectable filters (8 MHz and 34 MHz) for covering either standard−definition−like video applications or High Definition video applications. These frequencies are selectable using the pin SD/HD. If the application requires, the video driver outputs may also be disabled using the SD EN or SD/HD EN required by the application the pins SD EN or SD/HD EN. In the regular mode of operation each channel provides an internal voltage−to−voltage gain of 2 from input to output. This effectively reduces the number of external components required as compared to discrete approaches implemented with stand−alone op amps. An internal level shifter is employed shifting up the output voltage by adding an offset of 200 mV. This prevents sync pulse clipping and allows DC−coupled output to the 150 W video load. In addition the NCS2566 integrates a 6th−order Butterworth filter for each channel. This allows rejection of aliases or unwanted over−sampling effects produced by the video DAC. Similary for DVD recorders which uses an ADC, this anti−aliasing filter (reconstruction filter) will avoid picture quality issues and will aide filtration of parasitic signals caused by EMI interference. A built−in diode−like clamp is used in the chip for each channel to support the AC−coupled mode of operation. The clamp is active when the input signal goes below 0 V. The built−in clamp and level shifter allow the device to operate in different configuration modes depending on the DAC output signal level and the input common mode voltage of the video driver. When the configuration is DC−Coupled at the Inputs and Outputs the 0.1 mF and 220 mF coupling capacitors are no longer used and the clamps are in that case inactive; this configuration provides a low cost solution which can be implemented with few external components. The input is AC−coupled when either the input−signal amplitude goes over the range 0 V to 1.4 V or if the video source requires such a coupling. In some circumstances it may be necessary to auto−bias signals with the addition of a pull−up and pull−down resistors or only pull−up resistor (Typical 7.5 M W combined with the internal 800 kW pulldown) making the clamp inactive. The output AC−coupling configuration is advantageous for eliminating DC ground loop, but may have the drawback of increasing sensitivity to video line or field tilt issues if the output coupling capacitor is too small. DC ground loop with the drawback of making the device more sensitive to video line or field tilt issues in the case of a too low output coupling capacitor. In some cases it may be necessary to increase the nominal 220 mF capacitor value. All the device pins are protected against electrostatic discharge at a level of 4 kV HBM and 8 kV according to IEC61000−4−2. This feature has been considered with a particular attention with ESD structure able to sustain the typical values requested by the systems like Set Top Boxes or Blue-Ray players. This parameter is particularly important for video driver which usually constitutes the last stage in the video chain before the video output connector. The IEC61000-4-2 standard has been used to test our devices in the real application environment. Test methodology can be provided on request. |
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