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LM1209 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM1209 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 24 page Functional Description (Continued) TLH11884 11 FIGURE 6 Block Diagram of LM1208LM1209 Video Amplifier TLH11884 12 FIGURE 7 Timing Diagram Circuit Description VIDEO AMPLIFIER INPUT STAGE Figure 8 is a simplified schematic of one of the three video amplifiers input stage along with the recommended external components The IC pin numbers are circled and all external components are shown outside the dashed line The video input is applied to pin 6 via a 10 mF coupling capacitor and a 30X resistor The resistor is added to limit the current through the input pin should an applied voltage surge rise above VCC or drop below ground The performance of the LM1208LM1209 is not degraded by the 30X resistor How- ever if EMI is a concern this resistor can be increased to well over 100X where the rise and fall times will start to become longer DC bias to the input pin is provided by Q5 and its associated input circuitry Z1 is a 56V zener that generates the input bias voltage Q1 is a buffer to the zener reference voltage with 50V generated at its emitter Q3 and Q4 are connected as diodes Q2 is close to being a diode in this circuit This configuration will give about 20V at the collector of Q2 R2 and R3 are a voltage divider setting the base of Q5 to about 35V This sets the emitter of Q5 to about 28V the bias voltage of the video input This bias voltage is necessary to assure that the entire video signal stays within the active operating region of the LM1208 LM1209 The bias voltage goes through R6 a 20k resistor to the video input at pin 6 R4 and R6 are of the same value and R4 is used to compensate for beta variations of the http www nationalcom 11 |
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