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OPA360 Datasheet(PDF) 9 Page - Texas Instruments |
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OPA360 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 24 page  OPA360 SB0S294E − DECEMBER 2003 − REVISED SEPTEMBER 2006 www.ti.com 9 approximately 60mV. This is well within the linear output voltage range of the OPA360 with a standard 150 Ω video load. Figure 6 shows the function of the level shifter. Figure 6. Internal Level Shifter, Shifts Input Signal by Approximately 60mV to Prevent Sync Tip Clipping The level shift function is particularly useful when the output of the OPA360 is DC-coupled to the video load. However, it is also helpful when sag correction is employed. The offset helps to shift the video signal closer to the positive rail, so that with even a small 33 µF coupling capacitor, the output is well outside the saturation limits of the OPA360. Figure 7 shows the output swing of the OPA360, operated on 3.0V supplies, with a 22 µF sag correction capacitor and a 33 µF output coupling capacitor. The test signal is a 50Hz signal constructed to generate a 1/2 black, 1/2 white screen. This video pattern is one of the most difficult patterns to display because it is the worst case signal regarding signal swing. A worst case signal such as this is highly unlikely in normal operation. Any other signal has a lower swing range. Note in Figure 7 that neither the white nor the black portion of the video signal is clipped. Figure 7. Output Swing with 33 mF on 3V Supply OUTPUT SWING TO GND (SYNC PULSE) Figure 8 shows the true output swing capability of the OPA360 by taking the tip of the input sync pulse to a slightly negative voltage. Even when the output sync tip is at 8mV, the output shows no clipping of the sync pulse. Figure 8. Input Sync Tip at −30mV (Output Shows No Sign of Clipping) |
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