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ML6427CS Datasheet(PDF) 8 Page - Fairchild Semiconductor |
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ML6427CS Datasheet(HTML) 8 Page - Fairchild Semiconductor |
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8 / 17 page  ML6427 8 TYPICAL APPLICATIONS BASIC APPLICATIONS The ML6427 provides channels for two banks of inputs for RGB and composite video. The R and G channels can be used as luma inputs while the B channel can be used as a chroma input. Composite outputs and an H-sync output are also provided. There are several configurations available with the ML6427. Figure 4 includes a list of basic output options for composite, S-video, TV modulator, and RGB outputs. Note that each composite channel can drive a CV load and a channel modulator simultaneously. The ML6427 standalone can be used as an EVC or SCART cable driver with nine video sources (75 W or low impedance buffer) and seven video outputs. All inputs and outputs are AC coupled. When driving seven loads the power dissipation must be calculated to ensure that the junction temperature doesn't exceed 120ºC. EVC CABLE DRIVING The ML6427 can be configured to drive composite video, S-video, and horizontal sync through an EVC connector (Figure 5). Composite video and S-video inputs are filtered through 4th-order Butterworth filters and driven through internal 75 W cable drivers. A buffered H-sync output is also available. SCART CABLE DRIVING The ML6427 can be configured either as a SCART cable driver (Figure 4) or as a SCART cable driver and S-video driver (Figure 6). A horizontal sync output is also available. Note that the ML6427 can be used in a master-slave mode where the SYNCOUT signal from the master is used as the SYNCIN signal of the slave. This allows the CV, S-video, and RGB channels to operate under the same sync signals. Note that in SCART applications it is not always necessary to AC couple the outputs. Systems using SCART connectors for RGB and composite video can typically handle between 0 and 2VDC offset (see DC Coupled Applications section). RGB APPLICATIONS RGB video can be filtered and driven through the ML6427 in one of two ways: 1. For sync suppressed RGB the sync signal can be derived from the composite or luma signal on the inputs of CVINFA/Y2 or CVINFB/Y3. 2. For RGB with sync on the green signal the green channel must be fed into either the CVINFA/Y2 or CVINFB/ Y3 input. The sync will be extracted from green and used on red and bue channels. See also the SYNCIN and SYNCOUT Sections. OSD (ON-SCREEN DISPLAY) APPLICATIONS Unfiltered RGB video from an OSD processor needs to be filtered and then synchronized to a fast blanking interval or alpha-key signal for later video processing. With the total filter delay being 80ns ±10ns a D flip-flop or similar delay element can be used to delay the fast blanking interval or alpha-key signal. This will synchronize the RGB and OSD signals (Figure 9). CCIR656 AND CCIR601 APPLICATIONS Composite or luma channels can be fed back into an alternate channel or into another ML6427 (master-slave configuration) so that approximately 80dB/decade attenuation outputs are provided. The ML6427 can be configured for composite and luma loopback (Figure 7). H-sync outputs are also provided. CHANNEL MULTIPLEXING The ML6427 can be configured for multiple composite channel multiplexing (Figure 8). Composite sources such as VCRs, video game consoles, and camcorders can be selected using the ML6427 swap mux controls. A/B MUX, SWAP CVU, and SWAP CVF signals can be used to select and route from various input sources. DC COUPLED APPLICATIONS A 220µF capacitor coupled with a 150 W termination resistor forms a highpass filter which blocks DC while passing the video frequencies and avoiding tilt. Lower value capacitors, such as 10µF, would create a problem. By AC coupling the average DC level is zero. Consequently the output voltages of all channels will be centered around zero. Alternately, DC coupling the output of the ML6427 is allowable. There are several tradeoffs: The average DC level on the outputs will be 2V; Each output will dissipate an additional 40mW nominally; The application will need to accommodate a 1VDC offset sync tip; and it is recommended to use only one 75 W load per output. However, if it is necessary to drive two loads at a time on the composite output while DC coupling is used then the swap–mux and 5th line driver can be configured to enable the filtered composite signal on both the 4th and 5th line drivers. This divides the composite load driving requirement into two line drivers versus one. Required Setup: A composite or luma or green signal must be present on the CVINFA/Y2 or the CVINFB/Y3 input to provide necessary sync signals to the other channels (R, G, B, Y, C). Otherwise, sync must be provided at the SYNCIN pin. For RGB applications, the green channel with sync can be used as an input to CVINFA/Y2 or CVINFB/Y3. |
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