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LM1209 Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM1209
Description  130 MHz/100 MHz RGB Video Amplifier System with Blanking
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1209 Datasheet(HTML) 11 Page - National Semiconductor (TI)

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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
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11


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