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LM1203N データシート(PDF) 11 Page - National Semiconductor (TI) |
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LM1203N データシート(HTML) 11 Page - National Semiconductor (TI) |
11 / 16 page Additional Applications of the LM1203 Figure 9 shows how the LM1203 can be set up as a video buffer which could be used in low cost video switcher appli- cations Pin 14 is tied high to turn off the clamp compara- tors The comparator input pins should be grounded as shown Sync tip (black level if sync is not included) clamping is provided by diodes at the amplifier inputs Note that the clamp cap pins are tied to the Pin 11 24V reference This was done along with the choice of 200X for the drive pin resistor to establish an optimum DC output voltage The contrast control (Pin 12) will provide the necessary gain or attenuation required for channel balancing Changing the contrast control setting will cause minor DC shifts at the amplifier output which will not be objectionable as the out- put is AC coupled to the load The dual NPNPNP emitter follower will provide a low impedance output drive to the AC coupled 75X output impedance setting resistor The dual 500 mF capacitors will set the low frequency response to approximately 4 Hz TLH9178 – 9 FIGURE 9 RGB Video Buffer with Diode Sync Tip Clamps and 75X Cable Driver http www nationalcom 11 |
同様の部品番号 - LM1203N |
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同様の説明 - LM1203N |
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