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LM1253 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LM1253 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 57 page Test Settings TABLE 1. Control Test Settings Control No. of Bits Basic Test Setting 1 Basic Test Setting 2 Basic Test Setting 3 Basic Test Setting 4 Contrast 7 Max (Hex 7F) Max (Hex 7F) Max (Hex 7F) Max (Hex 7F) R,G,B Gain 7 Max (Hex 7F) Max (Hex 7F) Set for 1 V P-P on all Channels Max (Hex 7F) Brightness 8 Max (Hex FF) Max (Hex FF) Min (Hex 00) Min (Hex 00) R,G,B Bias 8 Max (Hex FF) Max (Hex FF) Min (Hex 00) Min (Hex 00) DC Offset 3 Min (Hex 07) Max (Hex 00) Min (Hex 07) Min (Hex 07) Pedestal Offset 3 Max (Hex 07) Max (Hex 07) Min (Hex 00) Min (Hex 00) Pin Descriptions Pin 1 — R EXT VREF A10 kΩ 1% resistor is connected to this pin to set up the internal current sources. The LM1253A is optimized for this value of resistor. A DC voltage only will be on this pin. Decreasing the value of this resistor will increase supply current while degrading performance; increasing the value of the resistor will decrease supply current and also degrade the performance. Do not place the resistor close to sources of heat such as the CRT driver. Figure 29 shows the components connected to pin 1, Figure 11 shows the internal schematic of pin 1. Pin 2 — V Blank Out This pin supplies a variable width, negative going pulse at the vertical rate to the CRT Driver. V Blank is triggered from the signal on pin 15, which comes from the vertical flyback. The CRT Driver supplies the pull up for this pin. The width of this pulse is set by the value in the VBLANKDUR register (8403h). Figures 4, 5, 6 show the re- sulting V Blank Out pulse with various values in register 8403h. The trace connecting pin 2 of the LM1253A to the LM2453 must be kept away from the output circuitry of the LM2453. Figure 29 shows the external schematic of pin 2, Figure 12 shows the internal schematic of pin 2. Pin 3 — V REF Cap A 0.1 µF capacitor is placed close to this pin to decouple V REF.VREF is used by the three video chan- nel circuits to make the VideoPlex signal. Figure 29 shows the external schematic of pin 3, Figure 13 shows the internal schematic of pin 3. Pin 4, 5, 6 — Blue, Red, and Green Video In The red, blue, and green video signal is AC coupled into these pins. The value of the capacitors is very important as they also serve DS101265-7 FIGURE 4. V Blank = 10 DS101265-8 FIGURE 5. V Blank = 63 DS101265-9 FIGURE 6. V Blank = 127 www.national.com 8 |
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