Datenblatt-Suchmaschine für elektronische Bauteile |
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LM1203A Datenblatt(PDF) 8 Page - National Semiconductor (TI) |
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LM1203A Datenblatt(HTML) 8 Page - National Semiconductor (TI) |
8 / 18 page Circuit Description (Continued) For individual gain adjustment of each video channel a 51X resistor in series with a 100X potentiometer should be used with the red and green channel drive pins A 91X resistor used with the blue channel drive pin sets the blue channel amplifier gain at approximately 62 The 100X potentiometer at the red and green channel drive pins allow a gain of 62 with g25% gain adjustment The video signal at the collec- tor of Q12 is buffered and level shifted down by Q13 Q14 and Q15 to the base of the output emitter follower Q16 A 50X decoupling resistor is included in series with the emitter of Q16 and the video output pin so as to prevent oscillations when driving capacitive loads An external resistor should be connected between the video output pin and ground The value of this resistor should not be less than 390X or else package power limitations may be exceeded under worst case conditions (high supply voltage maximum cur- rent maximum temperature) The collector current from the video output transistor of each video channel is returned to the power supply at VCC2 pin 23 When making power dissi- pation calculations note that the data sheet specifies only the VCC1 and VCC2 supply current at 12V supply voltage with no pull down resistor at the output (ie RL e % see test circuit Figure 2 ) The IC power dissipation due to VCC2 is dependant upon the external video output pull down resis- tor TLH11441 – 9 FIGURE 5 Block Diagram of LM1203A Video Amplifier with Contrast and Black Level Control http www nationalcom 8 |
Ähnliche Teilenummer - LM1203A |
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Ähnliche Beschreibung - LM1203A |
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